chemistry MCQs – Page 42

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 Review each marked answer and report any item that may be outdated or unclear.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
821. On heating aldehydes with Fehlings solution we get a precipitate whose colour is_________________?
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A. brick red

B. yellow

C. black

D. pink

822. During sulphonation of benzene H2SO4 generates the electrophile _________________?
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A. H+

B. HSO4-

C. SO3

D. SO2

823. Ionization energy depends upon____________________?
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A. I.E depends upon all of the above and nature of orbital

B. Nuclear charge

C. Atomic size

D. Shielding effect

824. Rate of reaction when concentration of reactants are taken as unity is called_________________?
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A. Ideal rate constant

B. Arrhenius constant

C. Specific rate constant

D. Molecularity

825. The ore CaSO4.H2O has the general name_______________?
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A. Calcite

B. Gypsum

C. Plaster of Paris

D. Dolomite

826. An element having low value of ionization energy and low value of electron affinity is likely to belong to__________________?
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A. Group VIIA

B. Group IA

C. Group IB

D. Group VIII

827. Which of the following is different with respect to physical appearance ?
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A. Antimony

B. Arsenic

C. Phosphorus

D. Bismuth

828. Carnalite has chemical formula__________________?
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A. KCI

B. CaCO3.MgCO3

C. KCI.MgCl2.6H2O

D. Na2B4O7.10H2O

829. SO3 is not absorbed in water directly because__________________?
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A. Reaction is exothermic

B. All of above

C. Dilute acid is produced

D. It is insoluble in water

830. Melting points of VII-A group elements down the group ____________________?
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A. Decrease

B. Remain constant

C. No regular trend

D. Increase
831. Which of the following is not a use of formaldehyde ?
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A. in making medicine urotropine

B. in silvery mirror

C. in making throat lozenges

D. in making acetic acid
832. Which compound form benzoic acid on oxidation with acidified KMnO4 or K2Cr2O7 ?
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A. Toluene

B. n-propyl benzene

C. All

D. Ethyl benzene

833. Tincal is a mineral of___________________?
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A. Si

B. B

C. A1

D. C

834. Michael Faraday discovered benzene in the gas which was produced by destructive distillation of vegetable oil that is done in________________?
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A. The presence of excessive Oxygen

B. The presence of Oxygen

C. The presence of Hydrogen

D. The absence of Oxygen
835. When a graph is plotted between 1/T on X-axis and log k on y-axis a straight line is obtained with a negative slope which has two end in__________________?
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A. II and III quadrant

B. II and IV quadrant

C. III and IV quadrant

D. I and II quadrant

836. Which of the following reagents will react with both aldehydes and ketones ?
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A. Fehlings reagent

B. Grignard reagent

C. Benedicts reagent

D. Tollens reagent

837. The organic acid that does not has COOH group is___________________?
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A. Succinic acid

B. phthalic acid

C. carbolic acid

D. Maleic acid

838. Which of the following cannot exist in solution_________________?
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A. O-2

B. Na+

C. Cl-

D. H+

839. Which of the following will decompose to produce litharge_________________?
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A. Pb3O4

B. PbO2

C. All of the above

D. Pb2O

840. Which one of following amino acid is neither acidic nor a basic in nature ?
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A. Lysine

B. Proline

C. Histidine

D. Glutamic acid