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NEET Chemistry Solved Question Paper 2004

Multiple Choice Questions

11.

What is the pH of 0.01 M glycine solution? For glycine $K_{a 1} = 4.5 \times 10^{- 3} and K_{a 2} = 1.7 \times 10^{- 10} at 298 K$ ?

12.

Of the following which change will shift the reaction towards the product?

$I_{2 (g)} ⇌ 2 I_{(g),} ∆ H_{f}^{°} (298 K) = + 150 kJ$

Increase in concentration of I
Decrease in concentration of I₂
Increase in temperature
Increase in total pressure

13.

Assertion : The free gaseous Cr atom has six unpaired electrons.

Reason: Half-filled s orbital has greater stability.

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.

14.
Assertion : Nuclear binding energy per nucleon is in the order - ${}_{4}^{9}{Be} > {}_{3}^{7}{Li} > {}_{2}^{4}{He}$
Reason : Binding energy per nucleon increases linearly with difference in number of neutrons and protons.

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.

If both assertion and reason are false.

Binding energy per nucleon of ₃Li⁷ (5.38 MeV) is lesser than ₂He⁴ (7.08 MeV) as helium is found to be more stable than Li. As the atomic mass number increases, the binding energy per nucleon decreases. As the atomic number and the atomic mass number increase, the repulsive electrostatic forces within the nucleus increase due to the greater number of protons in the heavy elements. To overcome this increased repulsion, the proportion of neutrons in the nucleus must increase to maintain stability. This increase in the neutron-to-proton ratio only partially compensates for the growing proton-proton repulsive force in the heavier, naturally occurring elements. Because the repulsive forces arc increasing, less energy must be supplied, on the average, to remove a nucleon from the nucleus. The binding energy per nucleon has decreased. The binding energy per nucleon of a nucleus is an indication of its degree of stability. Generally, the more stable nuclides have higher binding energy per nucleon than the less stable ones. The increase in binding energy per nucleon as the atomic mass number decreases from 260 to 60 is the primary reason for the energy liberation in the fission process. The increase in the binding energy per nucleon as the atomic mass number increases from 1 to 60 is the reason for the energy liberation in the fusion process, which is the opposite reaction of fission.

15.

Assertion : All F- S -F angle in SF₄ is greater than 90° but less than 180°.

Reason : The lone pair-bond pair repulsion is weaker than bond pair-bond pair repulsion.

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.

16.

Assertion : Effusion rate of oxygen is smaller than nitrogen.

Reason: Molar mass of nitrogen is smaller than oxygen.

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.