Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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31.

Which one of the following is 'd-block element?

  • Gd

  • Hs

  • Es

  • Cs


B.

Hs

The element in which last electron enters in d-orbital is called d-block element. The electronic configuration of the given elements are as follows:

Gd(64) = [Xe] 6s2, 4f7, 5d7

Hs(108) = [Rn] 7s2, 5f14, 6d6

Es(99) = [Rn] 7s2, 5f11

Cs(55) = [Xe] 6s1

Thus, Hs is d block element.


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32.

If the Ecell° for a given reaction has a negative value then which of the following gives the correct relationships for the values of G° and Keq?

  • G° < 0; Keq > 1

  • G° <0; Keq < 1

  • G° > 0; Keq < 1

  • G° > 0; Keq > 1


33.

Which of the following is an example for heterogeneous catalysis reaction?

  • 2SO2(g) + O2 NO(g) 2SO3(g)

  • Hydrolysis of aqueous sucrose solution in the presence of a aqueous mineral acid

  • 2H2O2 (l) Pt(s) 2H2O2(l) + O2(g)

  • Hydrolysis of liquid in the presence of aqueous mineral acid


34.

The relative reactivities of acyl compounds towards nucleophilic substitution are in the order of

  • acyl chloride > acid anhydride > ester > amide

  • ester > acyl chloride > amide > acid anhydride

  • acid anhydride > amide > ester > acyl chloride

  • acyl chloride> ester> acid anhydride > amide


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35.

Clemmensen reduction of a ketone is carried out in the presence of which of the following?

  • Zn-Hg with HCl

  • LiAlH4

  • H2 and Pt as catalyst

  • Glycol with KOH


36.

Which one of the following is employed as antihistamine?

  • Diphenyl hydramine

  • Norethindrone

  • Omeprazole

  • Chloramphenicol


37.

In DNA, the complimentary bases are

  • adenine and thymine; guanine and cy1osine

  • adenine and thymine; guanine and uracil

  • adenine and guanine, thymine and cytosine

  • uracil and adenine; cytosine and guanine


38.

Which of the following is not a resonating form of benzaldehyde?


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39.

Which one of the following does not undergo iodoform reaction?

  • Secondary butyl alcohol

  • Iso-propyl alcohol

  • Diethyl ketone

  • Ethyl alcohol


40.

Which of the following compounds gives carbylamine test?

  • N-methyl-o-methyl aniline

  • N, N-dimethyl aniline

  • 2, 4-diethyl aniline

  • p-methyl-N-methyl benzylamine


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