chemistry MCQs – Page 33

Practise multiple-choice questions from chemistry for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemistry Mcqs
641. The nutrients which are required in very small amount for the normal growth of plants are called_________________?
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A. micronutrients

B. phosphorus fertilizer

C. all of the above

D. nitrogenous fertilizers

642. The important function of burning zone in the rotary kilm is __________________?
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A. to dry the moisture of slurry

B. to reduce the impurities

C. combination of different oxides like CaO SiO2 Fe2O3 and Al2O3

D. to decompose lime stone to unslaked lime

643. Addition of CH3COOH and CH3COONa gives in water_______________?
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A. Standard solution

B. buffer solution

C. acidic buffer solution

D. both B & C
644. If the volume of solution is equal to sum of volumes of its all components then the solution_____________?
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A. will be an ideal solution

B. will be non-ideal solution

C. will show deviations from Raoults law

D. both b & c

645. Which substance can be used for disinfecting water ?
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A. Ozone

B. All

C. KMnO4

D. Alums

646. The value of activation energy is primarily determined by_______________?
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A. Chemical nature of reactants and products

B. Effective collision

C. Temperature

D. Concentration of reactants

647. The main product of bacterial action is_________________?
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A. NO2

B. NO

C. Nox

D. N2O3

648. Which has the minimum freezing point ?
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A. One Molal NaCI

B. One molal KCI solution

C. One molal urea solution

D. One molal CaCI2
649. Enzynies that catalyze the transfer of groups within molecule are called_________________?
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A. Transferases

B. Isomerases

C. Ligases

D. Lyases

650. Kc value has_______________?
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A. No units

B. Units

C. Both A & B

D. None

651. Unit of Kc is_______________?
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A. moles2dm+6

B. Kc may or may not have units

C. moles-2dm+6

D. moles+2dm-6

652. A single chlorine free radical can destroy how many ozone molecules ?
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A. 10000

B. 100000

C. 10

D. 100

653. The correct electronic configuration of Cr is____________________?
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A. [Ar]4s03d5

B. [Ar]4s23d4

C. [Ar] 4s23d4

D. [Ar]4s13d5
654. Which statement is wrong ?
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A. in the equatorial region it acts as pollutant

B. CFCs play effective role in removing O3 in the stratosphere

C. ozone acts as filter for UV radiations

D. the amount of ozone layer is greater in the region close to the equator
655. Decrease in oxidation number is called__________________?
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A. oxidation-reduction

B. all of above represent same entity

C. oxidation

D. reduction
656. In a galvanic cell________________?
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A. Chemical energy is converted into electricity

B. Electrical energy is converted into chemical energy

C. Chemical energy is converted into heat

D. Electrical energy is converted into heat

657. Density of H2SO4 in lead accumulator is__________________?
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A. 1.20g/cm3

B. 1.3g/cm3

C. 1.25g/cm3

D. 1.15g/cm3

658. In which of the following layer of atmosphere there is more thickness of ozone layer ?
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A. mesosphere

B. photosphere

C. troposphere

D. stratosphere
659. Radiations are absorbed in_______________?
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A. Spectrophotometer method

B. Optical relation method

C. Refractometric method

D. Dilatometric method

660. Mixtures which distill over without change in composition called___________________?
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A. ideal solution

B. amphoteric mixture

C. zeotropic mixture

D. azeotropic mixture