Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

Which one of the following is not a buffer solution?

  • 0.8M H2S + 0.8M KHS

  • 2M C6H5NH2 + 2M C6H5NH3-Br-

  • 3M H2CO3 + 3M KHCO3

  • 0.05M KClO4 + 0.05M HClO4


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52.

Time required to deposit one millimole of aluminium metal by the passage of 9.65 amperes through aqueous solution of aluminium ion is

  • 30 s

  • 10 s

  • 30,000 s

  • 10,000 s


B.

10 s

Al3+ + 3e- → Al

For deposition of 1 gm of equivalent = 96500 C

For deposition of 1 millimole = 96.500 C

As QIt ⇒ t = QI = 96.59.65 = 10 s


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53.

Subunits present in haemoglobin are

  • 2

  • 3

  • 4

  • 5


54.

Propan-1-ol can be prepared from propene by

  • H2O/H2SO4

  • Hg(OAc)2/H2O followed by NaBH4

  • B2H6 followed by H2O2

  • CH3CO2H/H2SO4


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55.

Which one of the following is not a surfactant?

  • CH3 - (CH2)15 - (CH3)2N+ - CH3Br-

  • CH3 - (CH2)14 - CH2 - NH2

  • CH3 - (CH2)16 - CH2OSO2-Na+

  • OHC - (CH2)14 - CH2 - COO-Na+


56.

Assertion : Glycosides are hydrolysed in acidic conditions.

Reason : Glycosides are acetals.

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

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

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


57.

Assertion : Benzyl bromide when kept in acetone water it produces benzyl alcohol.

Reason : The reaction follows SN2 mechanism.

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

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

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


58.

Assertion : Activity of an enzyme is pH dependent.

Reason : Change in pH affects the solubility of the enzyme in water.

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

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

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


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59.

Assertion : Hydroxyketones are not directly used in Grignard reaction.

Reason : Grignard reagents react with hydroxyl group.

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

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

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


60.

Assertion : Trans-2-butene on reaction with Br2 gives meso-2,3-dibromobutane.

Reason : The reaction involves syn -addition of bromine.

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

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

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


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