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CBSE

NEET Chemistry : Equilibrium

Multiple Choice Questions

51.

Aqueous solution of AlCl₃ is acidic towards litmus while of NaCl is not. The correct reason behind this is

AlCl₃, furnishes OH^- ion in the solution
AlCl₃, furnishes H⁺ ion in the solution
AlCl₃, furnishes both H⁺ well as OH^- ion in the solution
AlCl₃, is the salt of strong base and strong acid

52.

Both Mg and Fe metal can reduce copper from a solution having Cu²⁺ ion, according to equilibria.

Mg_(s) + Cu²⁺ $⇌$ Mg²⁺+ Cu_(s); K₁ = 6 x 10⁹⁰

Fe_(s) + Cu²⁺ $⇌$ Fe²⁺ + Cu_(s); K₂ = 3 x 10²⁶

Choose the correct option regarding above equilibrium

Mg removes more Cu²⁺ from solution
Fe removes more Cu²⁺ from solution
Both will equally remove Cu²⁺ from solution
Both metals cannot remove Cu²⁺ from solution

53.

For the reaction, N₂(g) + O₂(g) $⇌$ 2NO (g), the equilibrium constant is K₁. The equilibrium constant is K₂ for the reaction, 2NO(g) + O₂)g) $⇌$ 2NO₂(g). What is K for the reaction, NO₂(g) $⇌$ $\frac{1}{2} N_{2} (g) + O_{2} (g)$ ?

$\frac{1}{4 K_{1} K_{2}}$
${[\frac{1}{K_{1} K_{2}}]}^{\frac{1}{2}}$
$\frac{1}{K_{1} K_{2}}$
$\frac{1}{2 K_{1} K_{2}}$

54.

100 mL of a solution contains 2 g of acetic acid and 3g of sodium acetate providing K_a =1.8 x 10^-5 , then choose the correct option.

This solution is basic in nature
This solution is acidic in nature
This solution is amphoteric in nature
This solution is neutral in nature

55.

Which of the following is least likely to behave as Lewis base?

NH₃
BF₃
OH^-
H₂O

56.

The dissociation equilibrium of a gas AB₂ can be represented as

2AB₂ (g) $⇌$ 2AB (g) + B₂(g)

The degree of dissociation is 'x' and is small compared to 1. The expression relating the degree of dissociation (x) with equilibrium constant KP and total pressure p is

$\frac{2 K_{p}}{p}$
${(\frac{2 K_{p}}{p})}^{\frac{1}{3}}$
${(\frac{2 K_{p}}{p})}^{\frac{1}{2}}$
$\frac{K_{p}}{p}$

57.

The melting point of solid substances is directly proportional to pressure acting on them. However, ice-melts at a temperature lower than its usual melting point, when the pressure increases. This is because

ice is not a true solid
the bonds break under pressure
ice is less denser than water
pressure generates heat

58.

In an amino acid, the carboxyl group ionises at pK_a = 2.34 and ammonium ion at pK_a₂ = 9.60. The isoelectric point of the amino acid is at pH

4.32
3.34
9.46
5.97

59.

A buffer solution is prepared in which the concentration of NH₃ is 0.30 M and the concentration of N $H_{4}^{+}$ is 0.20 M. If the equilibrium constant, K_b for NH₃ equals 1. 8 x 10^-5, what is the pH of this solution? (log 2. 7 =0. 43).

9.43
11.72
8.73
9.08

60.

At radioactive equilibrium, the ratio between two atoms of radioactive elements A and B is 3.1 x 10⁹ : 1. If the half-life period of A is 2 x 10¹⁰ yrs, then the half-life of B is

9.54 yrs
2.14 yrs
3.29 yrs
6.45 yrs

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Subject

NEET Chemistry : Equilibrium

Multiple Choice Questions