NEET TEST SERIES 124 CHEMISTRY

1. pK_a for NH₄⁺ion is 8.24 at 100 ⁰(c) A solution of 0.2M NH₄OH and a solution of 0.1M HCI are mixed together in equivolume proportion. The pH of the resulting mixture at
100 ⁰C (K_w = 10⁻¹²) will be

(a) 8.24
(b) 10.24
(c) 3.76
(d) 77

Deselect Answer

a)

b)

c)

d)

2. A solution contains Pb²⁺ and Fe²⁺ ions. To it some quantity of Fe and Pb is added Then

a) concentration of Pb2+ ions will remain unaffected
b) concentration of Pb2+ ions will increase
c) concentration of Fe2+ ions will increase
d) concentration of Fe2+ ions will decrease.Deselect Answer

a)

b)

c)

d)

3. On which of the following factors, the rate constant does not depend?

(a) Temperature
(b) Concentration
(c) Presence of catalyst
(d) Nature of reactantsDeselect Answer

a)

b)

c)

d)

4. According of Kohlrausch’s law, the limiting value of molar conductivity of an electrolyte A₂B is

Deselect Answer

a)

b)

c)

d)

5. What volume of hydrogen gas at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by hydrogen.

(a) 44.8 L

(b) 22.4 L

(c) 89.6 L

(d) 67.2 L

Deselect Answer

a)

b)

c)

d)

6. Identify the product, P for the following reaction

Deselect Answer

a)

b)

c)

d)

7. Statement I: Among halogens, Iodine is the best oxidant.
Statement II: Iodine is the least electronegative atom among halogens.
Choose the correct answer from the given options.

a) Statement I is incorrect but statement II is true.
b) Both statement I and statement II are true.
c) Both statement I and statement II are false.
d) Statement I is correct but statement II is false.

Deselect Answer

a)

b)

c)

d)

8. Molal depression constant for a solvent is 4 kg/mol. The depression in the freezing point of solvent for 0.03 mol/kg solution of will be:

(a) 0.24 K
(b) 0.36 K
(c) 0.18 K
(d) 0.12 K

Deselect Answer

a)

b)

c)

d)

9. Resistance of 0.2 M solution of an electrolyte is 50 Ω. The specific conductance of the solution is 1.4 Sm^-1. The resistance of 0.5M solution of the same electrolyte is 280 Ω. The molar conductivity of 0.5M solution of the electrolyte is Sm² mol^-1.

(a) 5 × 10^-3(b) 5 × 10²(c) 5 × 10³(d) 5 × 10^-4

Deselect Answer

a)

b)

c)

d)

10. Match list I with list II.

Choose the correct answer from the given options.

(a) (A)-(i), (B)-(ii), (C)-(iii), (D)-(iv)
(b) (A)-(iii), (B)-(iv), (C)-(ii), (D)-(i)
(c) (A)-(ii), (B)-(i), (C)-(iii), (D)-(iv)
(d) (A)-(iv), (B)-(ii), (C)-(iii), (D)-(i)

Deselect Answer

a)

b)

c)

d)

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