Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-2>Q 16

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The range of most suitable indicator which should br used for titration of $X Na (0.1 M, 10 mL)$ with $0.1 M HCI$ should be ( Given $k_{b (x^{-})} = 10^{- 6}$ )

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Important Questions on Equilibrium

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Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-2>Q 17

Hoe many moles

{NH}_{3}

must be added to

2.0

litre of

0.80 M {AgNO}_{3}

in order to reduce the

{Ag}^{+}

concentration to

5 \times 10^{- 8} M . K_{f} of [Ag {({NH}_{3})}_{2}^{+}] = 10^{8}

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Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-2>Q 18

The solubility product of

{BaF}_{2}

has the value

1.7 \times 10^{- 4}

. If

V_{1} mL

of

{BaCI}_{2}

solution

(10^{- 1} M)

and

V_{2} mL of NaF

solution

(10^{- 2} M)

are mixed,what is the ratio

V_{1} : V_{2}

so that a precipitate may be obtained?

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Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-2>Q 19

At

18 ° C

, the solubility of

CdS

in water is

6.33 \times 10^{- 15} M

. What is the concentration of

{Cd}^{+}

ion in a solution of

pH = 1

saturated with

H_{2} S

gas, in which cocentration of

H_{2} S = 0.1 M

? The product of the first and second ionization constants of

H_{2} S

is

1.1 \times 10^{- 22}

at this temperature.

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Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-2>Q 20

What is the

pH

of solution made by adding

3.9 g {NaNH}_{2}

into water to make a

500 mL

solution

K_{b} ({NH}_{3}) = 2 \times 10^{- 5} [Na = 14, H = 1]

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Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-2>Q 21

10.2 g

of acetic anhydride was added to

989.9 g

of water to make a solution with a density of

1 g / mL

. If the

K_{a}

of acetic acid is

2 \times 10^{- 5}

, the

pH

of the solution would be

[C = 12, H = 1, O = 16]

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Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-2>Q 22

pH

of mixture of

1 M

benzoic acid

({pK}_{a} = 4.20) and 1 M C_{6} H_{5} COONa

, is

4.5,

What is the volume of benzoic acid required to prepare a

300 mL

buffer

[\log 2 = 0.3] ?

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Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-2>Q 23

An acid

HA (k_{a} = 10^{- 5})

reacts with

NaOH at 298 K

. What would be the value of the rate constant of the reverse reaction at the temperature if the rate constant of the forward reaction is

10^{- 11} {mol}^{- 1} {Lsec}^{- 1} ?

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Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-2>Q 24

The

pH of 1.0 M {NaHSO}_{4}

solution will be (given that

K_{1} and K_{2} for H_{2} {SO}_{4}

equal to

\infty and 10^{- 2}

respectively)-