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Chemistry is the branch of science concerned with the substances of which matter is composed, the investigation of their properties and reactions, and the use of such reactions to form new substances.Chemistry is the scientific discipline involved with compounds composed of atoms, i.e. elements, and molecules, i.e. combinations of atoms, their composition, structure, properties, behavior and the changes they undergo during a reaction with other compounds. Chemistry addresses topics such as how atoms and molecules interact via chemical bonds to form new chemical compounds.In the scope of its subject, chemistry occupies an intermediate position between physics and biology. It is sometimes called the central science because it provides a foundation for understanding both basic and applied scientific disciplines at a fundamental level.Chemistry was preceded by its protoscience, alchemy, which is an intuitive but non-scientific approach to understanding the constituents of matter and their interactions. Just follow the Mcqs online quiz being dispatched over here with respect to your preparation for entry admission test NTS PPSC OTS PTS and missllenous job exams simultaneously.
Here we have large collection of Chemistry Mcqs for all Students and jobs test preparation purpose. These Chemistry Mcqs will be updated on daily basis and added more multiple choice question about Chemistry frequently.You can prepare your Chemistry Subject for different classes like 9th class, 10th class ,11th class 12th class exams, Entry Test like MCAT NTS ,OTS ,PTS ,BTS, GTS, Jobs Test,Recruitment Test like PPSC CSS FPSC SPSC KPPSC and interviews here.
Chemistry Mcqs Online With Answers for NTS PPSC Entry Test Classes
Chemistry
Chemistry Mcqs with Answers solved online.
Which of the following compounds has non directional bond?
A. BF3
B. KBr
C. Mg CO3
D. NF3
Right Answer: B. KBr
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The main cause of ozone depletion is?
A. Acid rain
B. Use of CFCs
C. Global Warming
D. None of the above
Right Answer: B. Use of CFCs
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Gram atoms of hydrogen in 5.5g H2?
A. 5.50
B. 2.25
C. 5.45
D. 2.20
Right Answer: A. 5.50
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What is the pH of ideal buffer?
A. 10
B. 7
C. Less than 7
D. 0
Right Answer: B. 7
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Organic acids (Carboxylic acids) are considered as?
A. Strong acids
B. Mild acids
C. Weak acids
D. Mineral acids
Right Answer: C. Weak acids
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Which of the following hydroxide is more soluble in water?
A. LiOH
B. Mg(OH)2
C. Sr(OH)2
D. Ba(OH)2
Right Answer: D. Ba(OH)2
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Esters are?
A. Acidic
B. Basic
C. Neutral
D. None of these
Right Answer: C. Neutral
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Which one of the following radical is called benzyl radical?
A. C6H5
B. C6H5 – CH
C. C6H5 – C
D. C6H5 – CH2
Right Answer: D. C6H5 – CH2
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The study of elevation of boiling point is called?
A. Ebullioscopy
B. Cryoscopy
C. Osmometery
D. None of these
Right Answer: A. Ebullioscopy
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The process in which the orbitals of different energies and shape mix with each other to give equivalent hybrid orbitals is called?
A. Dissolution
B. Hybridization
C. Resonance
D. Ionization
Right Answer: B. Hybridization
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Equal volumes of CO and N2 are taken in identical conditions, The correct relationship between masses of two gases is?
A. CO < N2
B. N < CO3
C. CO = N2
D. All of these
Right Answer: C. CO = N2
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NHCommunities are _________ collection of organism.
A. Static
B. Dynamic
C. Biosphere
D. Random
Right Answer: B. Dynamic
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Why do farmers and gardeners often treat soil with ammonia sulphate?
A. To kill harmful insects
B. To reduce the acidity of the soil
C. To increase the nitrogen contents of the soil
D. To increase the oxygen contents of the soil
Right Answer: C. To increase the nitrogen contents of the soil
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Here the strongest acid is?
A. CH3COOH
B. CH3CH2COOH
C. Cl-CH2-COOH
D. Br-CH2-COOH
Right Answer: C. Cl-CH2-COOH
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Which one of the following is not affect of acid rain?
A. It decrease the pH of natural rain
B. It damages the buildings
C. It leaches metals like aluminium mercury and lead from soil
D. It increase the percentage of CO2 in the atmosphere
Right Answer: D. It increase the percentage of CO2 in the atmosphere
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Acetic acid (ethanoic acid) can be prepared by ethanol under?
A. Oxidizing condition
B. Reducing condition
C. Redox condition
D. 7.0 pH condition
Right Answer: A. Oxidizing condition
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What is the lattice energy of NaCl?
A. 787 J/mole
B. 780 kJ/mol
C. 790 kJ/mol
D. -787 kJ/mole
Right Answer: D. -787 kJ/mole
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If ethanoic acid is to be prepared by hydrolysis of alkyl nitriles, which of the following can be the reagent to be hydrolyzed?
A. CH3CN
B. HCN
C. CH3CH2CN
D. None of these
Right Answer: A. CH3CN
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The reagent which attacks a region where the electron density is high is called?
A. Nucleophile
B. Substrate
C. Electrophile
D. None of these
Right Answer: C. Electrophile
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Oxidation of SO2(g) in the presence of NO(g) catalyst is an example of?
A. Homogeneous catalysis
B. Auto catalysis
C. Heterogeneous catalysis
D. Negative catalysis
Right Answer: A. Homogeneous catalysis
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Total number of valance electrons of nitrogen atom in a ammonium ion is?
A. 6
B. 10
C. 8
D. 16
Right Answer: C. 8
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When 0.5 moles of Al2(SO4)3 are dissolved in water, total number of particles produced?
A. 1.2 x 1023
B. 3.0 x 1023
C. 1.5 x 1024
D. 2.5 x 1023
Right Answer: C. 1.5 x 1024
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Which of the following compounds has the highest % age of oxygen by weight?
A. CH3 – OH
B. C2H5 – OH
C. HCCOOH
D. H2O
Right Answer: D. H2O
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Which one is mono isotopic element?
A. Cl
B. H
C. F
D. Cd
Right Answer: C. F
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In a double bond connecting 2 atoms there is a sharing of?
A. 1 electron
B. 2 electrons
C. 3 electrons
D. two electron pairs
Right Answer: D. two electron pairs
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Ethylene is oxidized to acetaldehyde on commercial scale by the use of the catalyst which is?
A. PdCl2 and CuCl2
B. FeO and Mo2O3
C. Na2Cr2O7 and H2SO4
D. All of these
Right Answer: A. PdCl2 and CuCl2
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The electronic configuration of an element is 1s2 2s2 2p3. This represent a/an?
A. Ground State
B. Hybridized state
C. Excited state
D. Molecular state
Right Answer: A. Ground State
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Which pair of electrons of elements will have the same chemical properties?
A. 2, 24
B. 2, 4
C. 13, 22
D. 3, 11
Right Answer: D. 3, 11
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Which one complex is more stable?
A. [Cu(H2O)6]2+
B. [CuCl4]2-
C. [Pt(C2O4)2]2-
D. All have same stability
Right Answer: C. [Pt(C2O4)2]2-
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During the formation of an ester from acetic acid, what actually happens?
A. Displacement of the H+ from the acid by Cl
B. Displacement of the OH-1 from the acid by OCH3
C. Attachment of OCH3 with the carbonyl oxygen
D. Displacement of the H+ from the acid by NH2
Right Answer: B. Displacement of the OH-1 from the acid by OCH3
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Which one used in containers and pipe work for reactive and corrosive chemicals?
A. Silicone polymers
B. Teflon
C. Steel
D. None of these
Right Answer: B. Teflon
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Sulphuric acid is king of chemicals, in its reactions it generally not act as?
A. An acid
B. A reducing agent
C. Dehydrating agent
D. Oxidizing agent
Right Answer: B. A reducing agent
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Picric acid can be prepared from phenol by?
A. Halogenation
B. Oxidation
C. Nitration
D. Sulphonation
Right Answer: C. Nitration
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Which of the following statements regarding a catalyst is not true?
A. A catalyst does not alter the equilibrium in a reversible reaction
B. A catalyst can initiate the reaction which is not thermodynamically favourable
C. Catalytic reactions are very specific in nature
D. A catalyst remains unchanged in composition and quantity
Right Answer: B. A catalyst can initiate the reaction which is not thermodynamically favourable
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Isotopes differ in?
A. Properties with respect to their mass number
B. Properties with respect to their proton number
C. Isotopes don’t differ as they have same number of electrons and protons
D. All of the above
Right Answer: A. Properties with respect to their mass number
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Which of the following statements is not correct?
A. Double bond is stronger than the single bond
B. σ bond is stronger than π bond
C. Triple bond is shorter than double bond
D. σ bond is weaker than π bond
Right Answer: D. σ bond is weaker than π bond
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Which one is very weak acid?
A. HF
B. H2CO3
C. HCl
D. H2O
Right Answer: D. H2O
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. In Contact process for the manufacture of sulfuric acid, the most important reaction occurs in the catalyst chamber. Which set of the reactants and the catalyst are correct?
A. Sulfur, air and Pt
B. Sulfur, Oxygen and V2O5
C. Sulfur dioxide, air and V2O5
D. Sulfur dioxide air and steam
Right Answer: C. Sulfur dioxide, air and V2O5
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The correct order of equivalent conductance at infinite dilution among LiCl, NaCl and KCl is?
A. LiCl > NaCl > KCl
B. NaCl > KCl > LiCl
C. KCl > NaCl > LiCl
D. LiCl > KCl > NaCl
Right Answer: C. KCl > NaCl > LiCl
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Baeyer’s reagent is?
A. 1% alkaline KMnO4
B. (R)3Al and TiCl4
C. 1% acidified potassium dichromate
D. Liquid ammonia
Right Answer: A. 1% alkaline KMnO4
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Which of the following amino acid is optically inactive?
A. Phenyl amine
B. Asparagine
C. Glutamic acid
D. Glycine
Right Answer: D. Glycine
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The unit of rate constant depends on?
A. Number of reactants
B. Order of Reaction
C. Concentration terms
D. Molecularity of reaction
Right Answer: B. Order of reaction
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One mole of SO2 contains?
A. 6.002 x 1023 atoms of Oxygen
B. 6.002 x 1023 atoms of Sulphur
C. 18.1 x 1023 molecules of SO2
D. 4 g atoms of SO2
Right Answer: B. 6.002 x 1023 atoms of Sulphur
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Coinage metals have least reactivity because they have?
A. Positive oxidation potentials
B. Zero oxidation potentials
C. Positive reduction potentials
D. Zero reduction potentials
Right Answer: C. Positive reduction potentials
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Saturated triglycerides of fatty acids?
A. Fats
B. Soaps
C. Oils
D. Detergents
Right Answer: A. Fats
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Which is example of pentose?
A. Glucose
B. Glyceraldehyde
C. Ribose
D. All of these
Right Answer: C. Ribose
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Oxidation of SO2(g) in the presence of V2O5(s) is an example of?
A. Homogeneous catalysis
B. Auto catalysis
C. Heterogeneous catalysis
D. Negative catalysis
Right Answer: C. Heterogeneous catalysis
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All II-A group elements react with halogens to form halides of the type?
A. Ionic
B. Polymeric
C. Covalent
D. Amphoteric
Right Answer: A. Ionic
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Most of the reactions which give stable products are?
A. Endothermic
B. Isothermal
C. Exothermic
D. None of these
Right Answer: C. Exothermic
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Which of the following element is used in earth quick prediction?
A. Xe
B. Rn
C. F
D. Br
Right Answer: B. Rn
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The acidic character of amino acids is due to?
A. Amino group
B. Carbonyl group
C. Carboxylate
D. Carbonyl oxygen
Right Answer: C. Carboxylate
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When HCl gas is passed through saturated solution of rock salt, the solubility of NaCl?
A. Increases
B. May increases or decreases
C. Decreases
D. None of these
Right Answer: C. Decreases
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Carboxylic acid react with ammonia to form which salt?
A. Acid amide
B. Ammonium acetate
C. Acetic anhydride
D. Acetyl chloride
Right Answer: B. Ammonium acetate
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For d2sp3 hybridization, the expected shape is?
A. Tetrahedral
B. Square planar
C. Trigonal bipyramidal
D. Octahedral
Right Answer: D. Octahedral
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Which of the following not has equal number of atoms as that in 6g Molybdenum (Ar : 96)
A. 3 g O3
B. 4 g SO2
C. 4 g Ca
D. 5 g SO3
Right Answer: C. 4 g Ca
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What is the molecular formula of Benzenetriozonide?
A. C6H6O9
B. C6H5O9
C. C6H5O8
D. C6H6O6
Right Answer: A. C6H6O9
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Dehydration of alcohols with conc. H2SO4 at 180°C gives?
A. Ethers
B. Alkenese
C. Alkyl halides
D. Esters
Right Answer: B. Alkenes
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The ability of transition elements to form complexes is due to?
A. Small size of metal ion
B. Availability of empty d and f orbitals
C. Highly charged metal ion
D. All of these
Right Answer: B. Availability of empty d and f orbitals
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Maximum ammonia is used for the?
A. Explosive formation
B. Fertilizer itself
C. Manufacturing of fertilizer
D. Manufacturing of Nylon
Right Answer: C. Manufacturing of fertilizer
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Alkane nitrilescan be prepared by treating alkyl halide with?
A. Alcohol
B. Potassium cyanide
C. Alcoholic potassium cyanide
D. Water
Right Answer: C. Alcoholic potassium cyanide
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Which of the following is the strongest alkali?
A. NaOH
B. Ca(OH)2
C. CsOH
D. KOH
Right Answer: C. CsOH
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Which of the following formula is more reactive for hydrolysis?
A. -COOR
B. -COOH
C. -CONH2
D. -COCl
Right Answer: D. -COCl
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The Kw of water at 25°C is given by?
A. 10-7
B. 10-10
C. 10-12
D. 10-14
Right Answer: D. 10-14
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Which ion will have maximum heat of hydration?
A. Na+
B. Cs2+
C. Ba2+
D. Mg2+
Right Answer: D. Mg2+
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Which of the following species has lone pair of electrons on central atom?
A. CH4
B. NH+4
C. PCl5
D. PCl3
Right Answer: D. PCl3
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Which one is best buffer those have?
A. pH = pKa
B. pH > pKa
C. pOH < pKb
D. pKa = 0
Right Answer: A. pH = pKa
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Which of the following is alkyl halide?
A. CH3Cl
B. CH2Cl2
C. C2H4Cl2
D. All of these
Right Answer: A. CH3Cl
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Colligative property is not represented by?
A. Elevation of boiling point
B. Osmotic pressure
C. Freezing point
D. Relative lowering of vapor pressure
Right Answer: C. Freezing point
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The correct set of four quantum numbers for the valence electron of rubidium (Z = 37) is?
A. n = 5, 1 = 0, m = 0 and s = +1/2
B. n = 5, 1 = 1, m = 1 and s = +1/2
C. n = 5, 1 = 1, m = 0 and s = +1/2
D. n = 6, 1 = 0, m = 0 and s = +1/2
Right Answer: A. n = 5, 1 = 0, m = 0 and s = +1/2
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In which of the following Equilibiria will Kc and Kp have not the same value?
A. 2HI ⇌ H2 + I2
B. 2SO2 + O2 ⇌ 2SO3
C. N2 + O2 ⇌ 2NO
D. All of these
Right Answer: B. 2SO2 + O2 ⇌ 2SO3
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Which of the following contains 1 mole of the stated particle?
A. Chlorine molecules in 35.5 g of chlorine gas
B. Electrons in 1g of hydrogen gas
C. Hydrogen ions in 1dm3 of 1 mol dm-3 aqueous sulphuric acid
D. Oxygen atoms in 22.4 dm3 of oxygen gas at STP
Right Answer: B. Electrons in 1g of hydrogen gas
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All noble gases are?
A. Mono-atomic
B. Tri-atomic
C. Di-atomic
D. Polyatomic
Right Answer: A. Mono-atomic
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Which of the following has maximum steric hindrance?
A. (C2H5)2CO
B. CH3COCH3
C. C3H7COCH3
D. CH3COH
Right Answer: C. C3H7COCH3
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Elimination bimolecular reactions involve?
A. 1st order kinetics
B. Zero order kinetics
C. 2nd order kinetics
D. None of these
Right Answer: C. 2nd order kinetics
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In a mass spectrometer, increasing the magnetic field strength with constant electric field result in?
A. Increased ‘r’
B. Increased ionization
C. No effect
D. decreased ionization
Right Answer: C. No effect
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Combustion analysis is performed for the determination of?
A. Molar mass of the compound
B. Structural formula of the substance
C. Empirical formula of the compound
D. Mass of halogens present in organic compound
Right Answer: C. Empirical formula of the compound
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Number of molecules of sugar in 1dm3 of 1M sugar solution is?
A. 6.02 x 1023
B. 3.42 x 6.02 x 1022
C. 6.02 x 1020
D. None of the above
Right Answer: A. 6.02 x 1023
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Chloromethane is used in?
A. Production of silicone polymer
B. Petroleum refining
C. Manufacturing of butyle rubber
D. All of these
Right Answer: D. All of these
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Neo-pentyl alcohol is a type of alcohol?
A. Primary alcohol
B. Secondary alcohol
C. Tertiary alcohol
D. Aromatic alcohol
Right Answer: A. Primary alcohol
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Colligative properties can be used for calculating?
A. Density of a compound
B. Lattice energy of a compound
C. Molecular mass of a compound
D. All of the above
Right Answer: C. Molecular mass of a compound
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When the solvent is containing non volatile solute particles, then?
A. Vapor pressure is decreased
B. Vapor pressure doesn’t change
C. Vapor pressure is elevated
D. Volume is decrease
Right Answer: A. Vapor pressure is decreased
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Ethanoic acid manufacturing through ethanol involves the use of?
A. Acidified potassium dichromate
B. Both a and c
C. Ammonical silver nitrate
D. Fehling’s solution
Right Answer: A. Acidified potassium dichromate
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A compound contains 50% sulphur and 50% oxygen by mass. The empirical formula of the compound is?
A. S2O3
B. SO3
C. SO2
D. SO
Right Answer: C. SO2
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In the oxidation of unsymmetrical ketone using strong oxidizing agents like conc. HNO3, which carbon atom is preferentially attacked?
A. Carbon atom with the maximum number of hydrogen atoms
B. Carbon atoms with the least number of hydrogen atoms
C. Alpha carbon
D. Beta carbon
Right Answer: A. Carbon atom with the maximum number of hydrogen atoms
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Enzyme inactivation can be done by?
A. Exposing UV light
B. Exposing X-rays
C. Exposing beta rays
D. All of these
Right Answer: D. All of these
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When alcohols react with Na metal, the alkoxide ion thus formed is a strong?
A. Electrophile
B. Acid
C. Nucleophile
D. None of these
Right Answer: C. Nucleophile
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The stoichiometric calculations for a chemical reaction results in?
A. Actual yield
B. Theoretical yield
C. Percentage yield
D. Selectivity
Right Answer: C. Percentage yield
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One mole of a hydrocarbon X reacts completely with one mole of hydrogen gas in the presence of a heated catalyst. What could be the formula of X?
A. C2H6
B. C5H10
C. C3H8
D. C7H16
Right Answer: B. C5H10
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Which one of the following is alicyclic hydrocarbon?
A. Benzene
B. Isobutylene
C. Cyclohexane
D. Neopentane
Right Answer: C. Cyclohexane
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Which substance is mostly used as coagulant to remove the suspended particles of raw water?
A. Sodium chloride
B. Washing Soda
C. Alum
D. Chile salt Peter
Right Answer: C. Alum
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The production of acid amide involves the reaction of ethanoic acid with?
A. Amine
B. Amino acid
C. Ammonia
D. All of these
Right Answer: C. Ammonia
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Zinc does not show variable valency, because?
A. Its d-subshell is incomplete
B. It is relatively soft metal
C. Its d-subshell is complete
D. It has two electrons in outermost shell
Right Answer: C. Its d-subshell is complete
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Which compound is most reactive?
A. (CH3)3 CCl
B. (CH3)2 CHCl
C. CH3CH2Cl
D. All have same reactivity
Right Answer: A. (CH3)3 CCl
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A solution of glucose is 10%. The volume in which 1g mole of it will be dissolved is
A. 1 dm3
B. 200 dm3
C. 1.8 dm3
D. 180 dm3
Right Answer: C. 1.8 dm3
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Number of shared pair of electrons between C and O in a molecule of CO is?
A. 1
B. 3
C. 2
D. 4
Right Answer: B. 3
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Isotopes are?
A. Chemically similar
B. Physically dissimilar
C. Chemically dissimilar
D. Both a and b
Right Answer: D. Both a and b
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Which one of the following is the same for SiO2 and CO2?
A. Si – O bond distance and C – O bond distance
B. Empirical formula
C. Dipole moments
D. Bond angles
Right Answer: B. Empirical formula
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Polymer of chloroethylene is?
A. Teflon
B. Polystyrene
C. PVC
D. Nylon
Right Answer: C. PVC
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Which of the following test is used to identify amino acids?
A. Silver mirror test
B. Ninhydrin test
C. Iodoform test
D. Allof these
Right Answer: B. Ninhydrin test
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End to end overlapping of orbitals give rise to the formation of?
A. Sigma bond
B. Metallic bond
C. Pi bond
D. Co-ordinate covalent bond
Right Answer: A. Sigma bond
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