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 one among the following is good leaving group?
A. OH–
B. Cl–
C. F–
D. I–
Right Answer: D. I–
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Reduction of ketone using NaBH4 gives?
A. Primary alcohol
B. Tertiary alcohol
C. Secondary alcohol
D. Phenol
Right Answer: C. Secondary alcohol
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The manufacturing of nitrogenous fertilizer’s from ammonia is the result of?
A. Addition Reaction
B. Substitution Reaction
C. Acid-base reaction
D. Decomposition reaction
Right Answer: C. Acid-base reaction
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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 formula is more reactive for hydrolysis?
A. -COOR
B. -COOH
C. -CONH2
D. -COCl
Right Answer: D. -COCl
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Which pair has trigonal planar geometry?
A. NH3, PH3
B. H2O, C2H2
C. BF3, AlH3
D. CO2, SO2
Right Answer: C. BF3, AlH3
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Which of the following is not a colligative property?
A. Density
B. Elevation of boiling point
C. Depression in freezing point
D. Osmotic pressure
Right Answer: A. Density
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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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The substituent of chlorine in water disinfection?
A. Ozone
B. Chloramines
C. Hypochlorous acid
D. All of the above
Right Answer: A. Ozone
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Which statement is incorrect about reactivity of alkyl halides?
A. Greater the bond energy of R-X, lesser the reactivity
B. Greater the bond polarity of R-X, lesser the reactivity
C. Greater the bond energy of R-X, smaller the stability
D. Greater E.N difference of R-X, greater the stability
Right Answer: C. Greater the bond energy of R-X, smaller the stability
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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 pair can be used as a reactant for the preparation of acetyl chloride?
A. CH3COOH, HCl
B. CH3COOH, SOCl2
C. CH3, COOH, PCl5
D. Both b and c
Right Answer: D. Both b and c
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In esterification reaction, which one of the following bonds of alcohol undergo cleavage?
A. C – H
B. O – H
C. C – O
D. C – C
Right Answer: B. O – H
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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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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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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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How many electrons have to be removed to ionize 1.0 x 10-6 mol of Ne atoms to Ne+ ions in a neon advertising tube?
A. 6.02 x 1023 / 1.0 x 10-6
B. 1.0 x 10-6 x 6.02 x 1023 / 20.2
C. 1.0 x 10-6 x 6.02 x 1023
D. 1.0 x 10-6 x 6.02 x 1023 / 9.65 x 10-1
Right Answer: C. 1.0 x 10-6 x 6.02 x 1023
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Which cannot by hydrolyze?
A. Oligosaccharide
B. Polysaccharide
C. Monosaccharide
D. Lactose
Right Answer: C. Monosaccharide
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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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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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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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All alpha amino acids exist largely in proteins in the form of a dipolar structure is called?
A. Zwitter ion
B. Carbon-cation
C. Anion
D. None of these
Right Answer: A. Zwitter ion
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The extent of halogenations of alkanes depnds upon the factors?
A. Intensity of UV light
B. Temperature
C. Concentration of X2 used
D. Both a and b
Right Answer: C. Concentration of X2 used
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During an exothermic or endothermic reaction which one of the following formula is used to calculate the amount of heat evolved or absorbed
A. ∆H = ∆E + PV
B. ∆p = ∆H
C. ∆E = q + w
D. q = m x s x ∆T
Right Answer: D. q = m x s x ∆T
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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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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 optimum pH for enzyme activity is?
A. Less than 5
B. 6.4 to 6.9
C. More than 7
D. 9.4 to 9.6
Right Answer: B. 6.4 to 6.9
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The 2nd order reaction becomes 1st when?
A. One of the reactants is limiting
B. One of the reactants is in large excess
C. None of the reactants is in large excess
D. One of the reactant is acidic
Right Answer: B. One of the reactants is in large excess
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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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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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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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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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Which of the following can differ in different acids?
A. R Group
B. Carbonyl oxygen can be replaced in different amino acids
C. Carbonyl group
D. Amino Group
Right Answer: A. R Group
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Which one is not dicarboxylic acid?
A. Phthalic acid
B. Adipic acid
C. Benzoic acid
D. Oxalic acid
Right Answer: C. Benzoic acid
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Carbon sub oxide?
A. CO2
B. C3O2
C. C2O4
D. CO
Right Answer: B. C3O2
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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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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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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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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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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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Which of the following will not form enolate ion?
A. CH3COCH3
B. CH3CwHO
C. HCHO
D. All of these
Right Answer: C. HCHO
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Which one is the name of given compound by IUAC system of nomenclature?
A. CH2 = CH – CH = CH2
B. But-2-ene
C. 2-methyl-1-ene
D. Buta -1, 3 – diene
Right Answer: D. Buta -1, 3 – diene
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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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Which of the following halogen shows metallic luster?
A. Fluorine
B. Chlorine
C. Iodine
D. At
Right Answer: C. Iodine
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Which of the following is the example of derived proteins?
A. Proteoses
B. Collagen
C. Enzymes
D. Both a and c
Right Answer: D. Both a and c
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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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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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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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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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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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A solution has 92g ethanol, 96g methanol and 90g water. Mole fraction of water in the solution is?
A. 0.1
B. 0.4
C. 0.2
D. 0.5
Right Answer: D. 0.5
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Gold and silver are least reactive due to?
A. Positive oxidation potential
B. Zero oxidation potential
C. Positive reduction potential
D. Having large negative electrode potential
Right Answer: C. Positive reduction potential
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Dehydrohalogenation of RX occurs in the presence of?
A. An alcoholic base
B. An alcoholic salt
C. An alcoholic acid
D. An alcoholic Grignard reagent
Right Answer: An alcoholic base
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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 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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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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Which one is the oxidation state of Mn?
A. +2 and +3
B. +4 and +5
C. +6 and +7
D. All of these
Right Answer: D. All of these
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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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Which one metal shows maximum oxidation state?
A. Mn
B. Ag
C. Cr
D. Hg
Right Answer: A. Mn
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Which one alcohols is aromatic?
A. Glycerol
B. Ethane-1, 2 diol
C. 2-Phenylethanol
D. None of these
Right Answer: C. 2-Phenylethanol
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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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Which one increases by common ion effect except?
A. Crystallization
B. Solubility
C. Association of ions
D. All of these
Right Answer: B. Solubility
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10g NaOH is dissolved in 1000g water. The molality of NaOH is?
A. 1m
B. 0.5m
C. 4m
D. 0.25m
Right Answer: D. 0.25m
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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 ability of elements to act as reducing agent _________ down to electrochemical series.
A. Increase
B. Remain constant
C. Decreases
D. Depends upon the reaction conditions
Right Answer: C. Decreases
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At equilibrium, the concentration of reactants and products are?
A. Constant
B. Maximum
C. Different
D. Equal
Right Answer: A. Constant
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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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Which salts make the water hard?
A. Calcium
B. Aluminum
C. Magnesium
D. Both a and c
Right Answer: D. Both a and c
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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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Phenol on treatment with dil. HNO3 at low temperature give?
A. o-Nitrophenol
B. p-Nitrophenol
C. m-Nitrophenol
D. Mixture of o-Nitrophenol and p-Nitrophenol
Right Answer: D. Mixture of o-Nitrophenol and p-Nitrophenol
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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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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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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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Acetyl chloride is soluble in which solvent?
A. H2O
B. Acetone
C. Ether
D. Both b and c
Right Answer: D. Both b and c
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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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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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Buffer solutions are used in except?
A. Clinical analysis
B. Nutrition
C. Soil science
D. Qualitative analysis
Right Answer: D. Qualitative analysis
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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 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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During the formation of complex compound the Ligands bind with central metal ion/atom by?
A. Covalent bonds
B. Ionic bonds
C. Co-ordinate covalent bond
D. All of these
Right Answer: C. Co-ordinate covalent bond
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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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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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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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Which one of the following species is not an electrophile?
A. NH3
B. H+
C. Br+
D. BF3
Right Answer: A. NH3
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Which statement is incorrect about lipids
A. Derived from greek word lipos mean fat
B. Derived from fatty acid
C. Soluble in organic solvent
D. Soluble in water
Right Answer: D. Soluble in water
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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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When two amino acids are condensed releasing a water molecule, HN – C=O linkage thus formed is called?
A. α helix linkage
B. Peptide linkage
C. Glycosidic linkage
D. All of the above
Right Answer: B. Peptide linkage
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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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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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The compounds which are optically active are called?
A. Carbon with four difference groups
B. Chiral
C. Mirror image of one another
D. All of these
Right Answer: D. All of these
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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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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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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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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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What is the % of nitrogen in urea (NH2CONH2)?
A. 82.35%
B. 35%
C. 46.6%
D. 55.56%
Right Answer: C. 46.6%
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Which compound has only one structural form?
A. Ethane
B. Propane
C. Butane
D. Both a and b
Right Answer: D. Both a and b
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Aspartic acid is an amino acid but its nature is?
A. Acidic
B. Neutral
C. Basic
D. None of these
Right Answer: A. Acidic
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Change in enthalpy of ∆H a system can be calculated by following relationship?
A. ∆H = ∆E-PV
B. ∆H = ∆E-Q
C. ∆H = ∆E+q
D. ∆H = ∆E+P∆V
Right Answer: D. ∆H = ∆E+P∆V
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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 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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