chemistry MCQs – Page 25

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 Review each marked answer and report any item that may be outdated or unclear.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
481. Zn(s)/Zn+2(aq) 1M | | Cu+2(aq) 1M/Cu(s) is representation of reaction in______________?
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A. Voltaic cell

B. Nelsons cell

C. Daniel cell

D. Downs cell

482. Newspaper can be recycled again and again how many times ?
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A. 3

B. 4

C. 2

D. 5
483. Capacity of one lead accumulator cell is___________________?
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A. 1.5 volts

B. 2 volts

C. 3 volts

D. 1 volts

484. The yellow colour in photochemical smog is due to presence of__________________?
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A. chlorine dioxide

B. chlorine gas

C. dinitrogen oxide

D. nitrogen dioxide
485. When sparingly soluble salt is in equilibrium with molar concentration of its oppositely charged ion when the product is called_________________?
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A. dissociation constant for an acid

B. dissociation constant

C. solubility product

D. common ion effect

486. The oxidation state of transition elements is usually _______________________?
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A. infinite

B. variable

C. single

D. constant

487. The main pollutant of leather tanneries in the waste water is____________________?
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A. chromium III

B. chromium V

C. chromium IV

D. chromium VI

488. Pure metal__________________?
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A. none of these

B. corrode slowly

C. corrode rapidly

D. does not corrode easily
489. H2 gas in SHE is filled at pressure of___________________?
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A. 780mm of Hg

B. 750mm of Hg

C. 760mm of Hg

D. 800mm of Hg

490. Which one of the following raw material is not present in the cement ?
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A. gypsum

B. iron oxide

C. lime stone

D. KNO3

491. Coordination number of the transition element in [Pt Cl NO2 (NH3)4]2- is____________________?
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A. 6

B. 2

C. 8

D. 4

492. Ka<10-3 means______________?
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A. Very weak acid

B. Very strong acid

C. Very strong base

D. Very strong salt

493. All proteins yield ___________ upon complete hydrolysis?
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A. Nitrogen

B. Carbon and hydrogen

C. Amino acids

D. Sulphur

494. Acid present in acid rain may be__________________?
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A. H2SO4

B. HNO3

C. both A and B

D. none

495. Solution with maximum concentration of solute at given temperature is called________________?
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A. unsaturated solution

B. dilute solution

C. saturated solution

D. Super saturated solution

496. In which of the following equilibria will Kc and Kp have the same value ?
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A. N2 + O2 = 2NO

B. N2 + 3H2 = 2NH

C. PCI5 = PCI3 + Cl2

D. 2CO + O2 = CO2

497. The specie which donates electrons to central metal atom in coordination sphere is called____________________?
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A. Ligand is positively charged

B. anion

C. cation

D. acid

498. The half cells are interconnected through________________?
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A. salt bridge

B. no connection exists

C. wire

D. electric circuit

499. Which of the following is an example of liquid in gas solution?
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A. Opals

B. Paints

C. Dust particles in smoke

D. Fog
500. Homogeneous mixture of two or more than two compounds is called__________________?
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A. radical

B. solution

C. ion

D. compound