chemistry MCQs – Page 28

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 Review each marked answer and report any item that may be outdated or unclear.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
541. Water of crystallization can be removed by________________?
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A. All of the above

B. drying

C. heating

D. evaporation

542. Which of the following is not a heavy industry ?
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A. iron

B. none

C. fertilizer

D. paper

543. Which sequence of steps is correct for the manufacture of cement ?
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A. crushing grinding mixing heating

B. mixing heating grinding crushing

C. crushing heating mixing grinding

D. crushing mixing heating grinding and mixing

544. The percentage of nitrogen in urea is________________?
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A. 46%

B. 36%

C. 66%

D. 56%

545. Electricity in voltaic cell is produced due to_________________?
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A. neutralization

B. oxidation

C. reduction

D. both B & C
546. Solution of Na2SO4 will be_________________?
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A. neutral

B. cannot be presicted without data

C. basic

D. acidic

547. In partially miscible liquids the two layers are___________________?
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A. saturated solutions of each liquid

B. no layer formation takes place

C. unsaturated solutions of each liquid

D. normal solution of each liquid

548. Which of the following factors help to measure quallity of water ?
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A. all of the above

B. COD

C. DO

D. BOD

549. In Galvanic cell electrons flow from anode to cathode through__________________?
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A. salt bridge

B. movement of ions

C. all of the above

D. external electric circuit
550. An enzyme has its specificity due to________________?
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A. Temperature

B. Pressure

C. Substrate

D. Structure
551. At start of reaction the concentration of reactants is_______________?
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A. constant

B. high

C. low

D. according to Kc

552. In K2Cr2O7 the oxidation number of chromium is____________________?
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A. -7

B. 7

C. 6

D. -6

553. Chemical equilibrium state is_______________?
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A. static state

B. unidirectional state

C. free state

D. dynamic state
554. On increasing the temperature the rate of reaction increases mainly because_________________?
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A. Concentration of the reacting molecules increases

B. None of these

C. Collision frequency increases

D. The activation energy of the reaction increases

555. In pig iron the concentration of C-atom is ___________________?
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A. 0.25 2.5%

B. 2.0 4.0%

C. 0.12 0.25%

D. 2.5 4.5%
556. Polymers described as large molecules built up from small repeating units called________________?
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A. Dimers

B. metamers

C. Biopolymers

D. Monomers
557. The mechanism by which the genetic information can be duplicated is called_________________?
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A. Mutation

B. Duplication

C. Replication

D. Transcription

558. ppm means________________?
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A. parts of solute in one million parts of solution

B. parts of solvent in 1000 parts of solute

C. parts of solute in 1000 parts of solvent

D. parts of solvent in one million parts of solute

559. In an electrolytic cell current flows ?
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A. From cathode to anode in outer circuit

B. From anode to cathode outside the cell

C. From cathode to anode inside the cell

D. both B & C

560. If electricity is passed through CuSO4 solution by using Pt electrode then which of the following possible change occurs ?
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A. All are possible

B. H2 is deposited at cathode

C. Cu is deposited at anode

D. Colour of the solution becomes fade