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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.

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.

36.

Which of the following is soluble in water?

37.

Which azide is explosive?

Ba(N₃)₂
NaN₃
KN₃
Mg₃N₂

38.

Strongest acid among the following is

acetic acid
FCH₂COOH
F₂CHCOOH
F₃CCOOH

39.
Which of the following hydrogen halides is most basic?

HF

HCl

HBr

HI

The bond strength H-X decreases from HF to HI. Thus HF is the most stable and hence weakest acid while is least stable and most acidic. In aqueous solutions, HF is only slightly ionised but HCl, HBr and HI are almost completely ionised. As basicity is the reverse of acidity. Therefore, HF is the most basic of all H-X.