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NEET Chemistry Solved Question Paper 2001

Multiple Choice Questions

31.

Hardest compound of boron is

magnesium boride
aluminium boride
boron nitride
boron carbide

32.
Rate determining step in nitration of benzene is

formation of NO₂⁺

formation of carbocation

replacement of H atom

none of these.

formation of carbocation

The nitration of benzene takes places in three steps, i.e.
(i) Generation of electrophile (NO₂⁺)
(ii) Attack of an electrophile to benzene ring forming the carbocation
(iii) Loss of proton from carbocation giving nitrobenzene.
The attack of electrophile to benzene ring giving a carbocation is the slowest and rate determining step.

33.

The aqueous solution of which of the following salt will have the lowest pH ?

NaClO₃
NaClO
NaClO₄
NaClO₂

34.

Which ofthe following alkanes is optically active?

3-Methylhexane
Propane
2, 3, 4-Trimethylpentane
2-Methylbutane

35.

Assertion : Na₂SO₄ is soluble in water while BaSO₄ is not.

Reason : Lattice energy of BaSO₄ exceeds its hydration energy.

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 Assertion is false but Reason is true.