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.
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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The cell in which electrical energy is converted into chemical energy is?
A. Galvanic cell
B. Electrolytic cell
C. Volatic cell
D. All of these
Right Answer: B. Electrolytic cell
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Which of the following reacts with aqueous alkaline iodine?
A. 1-Propanol
B. Methanol
C. Ethanol
D. 2-Methyl-2-propanol
Right Answer: C. Ethanol
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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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The following molecules has linear structure except?
A. CS2
B. SO2
C. CO2
D. BeCl2
Right Answer: B. SO2
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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 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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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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Which of the following statement is correct?
A. Zn can replace Cu2+ in CuSO4
B. Cu can replace H+ in H2SO4
C. Cu can replace Zn2+ in ZnSO4
D. None of these
Right Answer: A. Zn can replace Cu2+ in CuSO4
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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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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 concentration of reactant in the reaction is increased by 8 times, the rate increased only by 2 times. what is the order of reaction?
A. 1
B. ½
C. 1/3
D. 2
Right Answer: C. 1/3
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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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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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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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Which one can be used as test for phenol?
A. C6H5OH + CH3COCl in the presence of aq. NaOH
B. C6H5OH + HCHO in the presence of NaOH
C. C6H5OH ONa + CH3CH2 Br
D. C6H5OH + Br2 (excess)
Right Answer: D. C6H5OH + Br2 (excess)
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A basic buffer solution can be prepared by mixing?
A. Strong acid and its salt with weak base
B. Strong base and its salt with weak acid
C. Weak base and its salt with strong acid
D. Weak acid and its salt with strong base
Right Answer: C. Weak base and its salt with strong acid
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If an electrophile is the attacking reagent which one is most reactive?
A. R – I
B. R – Br
C. R – Cl
D. R – F
Right Answer: D. R – F
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If ionic product is equal to Ksp then the solution is?
A. Unsaturated
B. Ideal
C. Supersaturated
D. Saturated
Right Answer: D. Saturated
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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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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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Which one is chemical method for the determination of rate of reaction?
A. Spectometry
B. Refractrometric method
C. Dilatometric method
D. Titration
Right Answer: D. Titration
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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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Standard hydrogen electrode has an arbitrary fixed potential of?
A. 0 V
B. 0.1 V
C. 1.0 V
D. 0.001 V
Right Answer: A. 0 V
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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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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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The half life period of zero order reaction is equal to?
A. 0.693/K
B. 1/Ka
C. a/2
D. 1.5/Ka2
Right Answer: C. a/2
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Oleum is prepared by?
A. Absorbing SO3 into water
B. Absorbing SO3 into sulfuric acid
C. Absorbing SO2 into water
D. Absorbing SO2 into sulfuric acid
Right Answer: B. Absorbing SO3 into sulfuric acid
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That solution which possess maximum concentration of solute at given temperature is known as?
A. Unsaturated
B. Saturated
C. Super saturated
D. Dilute solution
Right Answer: B. Saturated
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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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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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Which of the following is correct about SN2 reactions?
A. Retention of the configuration of alkyl halide molecule
B. Unimolecular reactions
C. Reaction rate is a function of the [alkyl halide]
D. All of these
Right Answer: D. All of these
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What will be the pH of 1.0 mol dm-3 of NH4OH, which is 1% dissociated?
A. 2
B. 12
C. 0
D. 2.7
Right Answer: B. 12
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Replacement of hydrogen of benzene by alkyl group in the presence of alkyl halide and aluminum chloride is known as?
A. Dow’s process
B. Friedel and Craft alkylation
C. Friedel and Craft acylation
D. Clemmenson reduction
Right Answer: B. Friedel and Craft alkylation
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Which substance does not oxidize easily?
A. CH3CH2CHO
B. CH3CHO
C. HCHO
D. CH3COCH3
Right Answer: D. CH3COCH3
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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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Which one among the following is not a good leaving group?
A. HSO4
B. OH–
C. Cl–
D. Br–
Right Answer: B. OH–
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The impacts of dumping solid wastes in landfills?
A. Affected marine life
B. Affected aquatic plants life
C. Affected crop quality
D. All of the above
Right Answer: D. All of the above
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. In laboratory the decomposition of hydrogen peroxide is carried out best by using _____ catalyst.
A. Mn
B. Finally powdered MnO2
C. Chromium
D. All of these
Right Answer: B. Finally powdered MnO2
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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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The solubility of Fe(OH)3 is x molar per dm3. Its Ksp would be?
A. 9x3
B. 27x4
C. 3x4
D. 9x4
Right Answer: B. 27x4
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250cm3 of 0.2 molar potassium sulphate solution is mixed with 250cm3 of 0.2 molar KCl solution. The molar concentration of K+ ions is?
A. 0.2 molar
B. 0.3 molar
C. 0.25 molar
D. 0.35 molar
Right Answer: B. 0.3 molar
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Fats and oils are the example of?
A. Simple lipids
B. Associated lipids
C. Compound lipids
D. Derived lipids
Right Answer: A. Simple lipids
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1 gram molecule refers to
A. Amount in grams equivalent to 1 mole of an atom
B. Amount in grams equivalent to 1 mole of a molecule
C. Amount in grams equivalent to 1 mole of a molecule or a compound
D. Amount in grams of an ionic compound
Right Answer: B. Amount in grams equivalent to 1 mole of a molecule
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1 gram formula refers to?
A. Amount in grams equivalent to 1 mole of an atom
B. Amount in grams equivalent to 1 mole of a covalent compound
C. Amount in grams equivalent to 1 mole of a ionic compound
D. Amount in grams equivalent to 1 mole of an ion
Right Answer: C. Amount in grams equivalent to 1 mole of a ionic 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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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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Which of the following has maximum reactivity in nucleophilic substitution reactions?
A. Formaldelyde
B. Acetaldehyde
C. Propanone
D. All of these
Right Answer: A. Formaldelyde
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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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Reduction of an aldehyde using NaBH4 gives?
A. Primary alcohol
B. Tertiary alcohol
C. Seconadry alcohol
D. Phenol
Right Answer: A. Primary alcohol
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During combustion analysis, which one is used for absorbing carbon dioxide?
A. 50% KOH solution
B. Mg (ClO4)2
C. Silica gel and Mg (ClO4)2
D. Silica gel
Right Answer: A. 50% KOH solution
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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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Ethanoic acid can be prepared by hydrolysis of?
A. Methyl chloride
B. Methane nitrile
C. Ethane nitrile
D. Ethyl chloride
Right Answer: B. Methane nitrile
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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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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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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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The quality of raw water is improved by?
A. Reduction
B. Dehydration
C. Aeration
D. Incineration
Right Answer: C. Aeration
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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 one of the following doesn’t react quickly with water at room temperature?
A. K
B. Mg
C. Li
D. Na
Right Answer: A. K
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Iron can be prevented from rusting by?
A. Connecting iron to more electropositive metal, a case of cathodic protection
B. Connecting iron to more electropositive metal, a case of anodic protection
C. Connecting iron to less electropositive metal, a case of anodic protection
D. Connecting iron to less electropositive metal, a case of cathodic protection
Right Answer: B. Connecting iron to more electropositive metal, a case of anodic protection
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Which of the following is not a characteristic of SiO2?
A. High transparency to light
B. Very low thermal expansion
C. Solubility in aqua rigia
D. Excellent insulator
Right Answer: C. Solubility in aqua rigia
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What type of reaction occurs between ethane and hydrogen?
A. Addition
B. Dehydration
C. Neutraliization
D. Oxidation
Right Answer: A. Addition
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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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The temperature at which nitrogen oxidized to NO during HNO3 production is?
A. 1000°C
B. 1500°C
C. 2000°C
D. 3000°C
Right Answer: D. 3000°C
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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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Most stable carbonium ion is?
A. (CH3)3 – C – +CH2
B. (CH3)3 – C+
C. +CH3
D. CH3 – +CH – CH3
Right Answer: B. (CH3)3 – C+
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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 of the following is not primary pollutant?
A. SO3
B. CO
C. NO
D. H2SO4
Right Answer: D. H2SO4
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The preparation of vegetable ghee involves?
A. Halogenation
B. Hydroxylation
C. Hydrogenation
D. Dehydrogenation
Right Answer: C. Hydrogenation
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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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Thioalcohol is prepared when alkyl halide is reacted with?
A. OH–
B. SH–
C. NO–2
D. I–
Right Answer: C. NO–2
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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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The contact process was first developed by?
A. Jabir bin hayyan
B. Birkeland
C. Henary
D. Knietsch
Right Answer: D. Knietsch
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A nanopeptide contains ________ peptide linkages.
A. 10
B. 8
C. 4
D. 9
Right Answer: B. 8
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Which of the following transition used as a catalyst in Haber’s process?
A. Fe
B. Cr2O3
C. Al2O3
D. All of these
Right Answer: A. Fe
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Hydrolysis of amides gives the corresponding?
A. Carboxylic acid
B. Alkane
C. Alcohol
D. Amino acid
Right Answer: A. Carboxylic acid
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The exothermic process is?
A. Evaporation
B. Respiration
C. Sublimation
D. Boiling
Right Answer: B. Respiration
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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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Which one is mono haloalkane?
A. CH2Cl2
B. CHCl3
C. Ch3 – CH3 – CH2 – Cl
D. CCl4
Right Answer: C. Ch3 – CH3 – CH2 – Cl
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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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What is the example of zwitter ions?
A. Metamerism
B. Functional group isomerism
C. Tautomerism
D. Positional isomerism
Right Answer: Tautomerism
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For producing a carboxylic acid derivative. The addition of nucleophile to carboxyl group is always followed by displacement of?
A. -COOH group
B. H atom
C. -OH atom
D. OR
Right Answer: C. -OH atom
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Molecular ions are produced in mass spectrometer. Which type of molecular ions are more abundant?
A. Negatively charged
B. Positively charged
C. H+ ions
D. Equal positive and negative ions
Right Answer: B. Positively charged
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Which of the following can be used for alcohol denaturing?
A. Methanol
B. Pyridine
C. Acetone
D. All of these
Right Answer: D. All of these
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Alcohol in which – OH group is attach to carbon which is further attach to only one alkyl group is?
A. Primary alcohol
B. Secondary alcohol
C. Tertiary alcohol
D. None of these
Right Answer: A. Primary alcohol
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Identify the correct order of increasing energy?
A. 1s < 2s < 3s
B. 2s > 3s > 1s
C. 1s > 2s > 3s
D. None of these
Right Answer: A. 1s < 2s < 3s
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Total number of hybrid orbitals of all carbon atoms in benzene are?
A. 3
B. 12
C. 6
D. 18
Right Answer: D. 18
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In contact process SO3 manufacturing is favour at low temperature but in actual practice the reaction is carried out at 400-600°C the reason is that?
A. At high temperature reaction will be fast
B. Rate of forward reaction is low
C. Equilibrium will established later
D. Separation is easy at high temperature
Right Answer: B. Rate of forward reaction is low
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The dipolar structure of α-amino acids are called?
A. Internal salt
B. Double salt
C. Carboxylate salt
D. Basic salt
Right Answer: A. Internal salt
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The unit of rate constant is the same as that of the rate of reaction in?
A. 1st order reaction
B. Zero order reaction
C. 2nd order reaction
D. 3rd order reaction
Right Answer: B. Zero order reaction
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Arrhenius equation can be used for evaluating?
A. Specific rate constant
B. Both of the above
C. Activation energy
D. Half life period
Right Answer: C. Activation energy
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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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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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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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According to Hess’s Law, the enthalpy change for a reaction?
A. Depends on path
B. The sum of ∆E and ∆H
C. Independent of the path
D. None of these
Right Answer: C. Independent of the path
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The naturally occurring amino acids are?
A. α-amino acids
B. β-Amino acids
C. γ-amino acids
D. All are included in naturally occurring
Right Answer: D. All are included in naturally occurring
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Which of the following is the example of proteins?
A. Albumin
B. Legumin
C. Globulin
D. All of these
Right Answer: D. All of these
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What is the Colour of K2Cr2O7 ?
A. Red
B. Green
C. Orange
D. Yellow
Right Answer: C. Orange
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Which of the following can be reagent to produce acetyl chloride from ethanoic acid?
A. Thionyl chloride
B. NaCl
C. PCl5
D. Both a and c
Right Answer: D. Both a and c
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Benzene is heated in air with V2O5 at 450°C it undergoes?
A. Substitution reaction
B. Elimination reaction
C. Addition reaction
D. Oxidation reaction
Right Answer: D. Oxidation reaction
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