chemistry MCQs – Page 31

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 Review each marked answer and report any item that may be outdated or unclear.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
601. The gases become non-ideal at ________________?
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A. High temperature and low pressure

B. Low temperature and low pressure

C. High temperature and high pressure

D. Low temperature and high pressure
602. The compounds in which water molecules are added are called_______________?
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A. hydrates

B. double salts

C. complexes

D. Hydrated ions

603. Polyester resins are the product of the reaction of__________________?
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A. Dihydric alcohol and dicarboxylic aromatic acids

B. Epichlorohydrin with diphenylol propane

C. Polyamines with aliphatic dicarboxylic acids

D. Styrene in the presence of catalyst

604. Rate of disappearance of reactant is equal to_________________?
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A. A and B

B. Rate of reaction

C. Rate of formation of product

D. Energy released during reaction

605. The oxidation number of central metal atom in [Ni(CO)4] is_________________?
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A. 4

B. 6

C. 0

D. 2

606. Nylon is obtained by heating___________________?
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A. Epichlorohydrin

B. Acrylic acid

C. Vinyl chloride

D. Adipic acid with hexamethylene diamine
607. Which of the following is macronutrient ?
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A. Zn

B. Cl

C. Cu

D. H
608. Sodium benzoate and benzoic acid are mixed in equimolar ration to form buffer if pKa is 2 what will be the pH ?
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A. any one

B. 1

C. 0

D. 2
609. The compound or complex ion which has a ring in its structure__________________?
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A. hydrate

B. monodentate ligand

C. chelate

D. polydentate ligand

610. Boiling point elevations can be measured by__________________?
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A. Landsbergers method

B. none of the above

C. Linds method

D. Beckmanns method

611. Which of the following is not a secondary pollutant_________________?
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A. sulphuric acid

B. ozone

C. carbon dioxide

D. carbonic acid

612. How many zones through which the charge passes in a rotary kiln ?
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A. 2

B. 5

C. 3

D. 4
613. Apparent charge on atom in molecule is___________________?
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A. oxidation number

B. valency

C. coordination number

D. charge number

614. Voltaic cell can be recharged by______________?
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A. by heating it

B. by removal of solution

C. by replacing external circuit with external source of electricity

D. by addition of fresh solution

615. The relative lowering of vapour pressure is_____________________?
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A. equal to the mole fraction of solvent

B. equal to the mole fraction of solute

C. directly proportional to the mole fraction of solute

D. both B & C
616. The degree of dissociation of week electrolyte increases as________________?
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A. None

B. Dilution decreases

C. Pressure increases

D. Dilution increases
617. Pollutants have adverse effect over_________________?
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A. Biosphere

B. Ecosystem

C. Both a & b

D. Hydrosphere

618. The rate of reaction___________________?
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A. Remains the same as the reaction proceeds

B. May decrease or increase as the reaction proceeds

C. Increases as the reaction proceeds

D. Decreases as the reaction proceeds
619. Residence time of methane in the atmosphere is___________________?
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A. 3 7 days

B. 3 7 years

C. 2 -3 days

D. 2 3 years

620. 58.5g of of NaCl per 1 dm3 of solution of NaCl in water the concentration of solution will be___________________?
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A. 1 m

B. 0.1 N

C. 1 M

D. 0.1 M