Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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41.

Assertion : Ozone is an allotrope of oxygen.

Reason : Oxygen is bluish colour liquid and in singlet state it is more paramagnetic.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


C.

If assertion is true but reason is false.

Oxygen is a colourless, odourless and tasteless gas. It is paramagnetic in gaseous, liquid and solid states. It can be liquefied to a pale blue liquid by compressing the gas at a very low temperature. Its allotropic modification is ozone.


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42.

Assertion : SnI4 is an orange solid.

Reason : The colour arises due to charge transfer.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


43.

Assertion : Magnetic moment of Dy is the highest among the lanthanoids.

Reason : Orbital motion contributes magnetic moment.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


44.

Assertion : The kinetics of the reaction

mA + nB + pC → m'X + n'Y + p'Z

obeys the reaction as- dxdt = k[A]m[B]n

Reason : The rate of reaction does not depend upon the concentration of C.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


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45.

In the following sequence of the reactions, what is D ?

  • Primary amine

  • An amide

  • Phenyl isocyanate

  • A chain lengthed hydrocarbon


46.

CH3OC2H5 and (CH3)3C-OCH3 are treated with hydroiodic acid. The fragments after reactions obtained are

  • CH3I + HOC2H5; (CH3)3C-I + HOCH3

  • CH3OH + C2H5I; (CH3)3Cl + HOCH3

  • CH3OH + C2H5; (CH3)3C-OH + CH3I

  • CH3I + HOC2H5; CH3I + (CH3)3C-OH


47.

Which of the following amines will not give N2 gas on treatment with nitrous acid (NaNO2 + HCl)?

  • C2H5NH2

  • CH3NH2

  • (CH3)2CH-NH2

  • All will give N2


48.

On mercuration and demercuration, the following compound gives

  • None of these


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49.

The product obtained is/are

  • o-product

  • m-product

  • o- and p-products

  • o-, m- and p-products


50.

Benzoic acid is treated with lithium aluminium hydride. The compound obtained is

  • benzaldehyde

  • benzyl alcohol

  • toluene

  • benzene


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