Chemistry Crash Course JEE Main>Chapter 12 - Equilibrium>Level 1>Q 83

MEDIUM

JEE Main

IMPORTANT

Earn 100

If ${PCl}_{5}$ is heated to $250 ° C$ and allowed to reach equilibrium, $50 %$ of ${PCl}_{5}$ is dissociated. Calculate how many moles of ${Cl}_{2}$ must be mixed with one mole of ${PCl}_{5}$ to reduce the dissociation to $40 %$ , with the volume remaining constant.

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Important Questions on Equilibrium

MEDIUM

JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 12 - Equilibrium>Level 1>Q 84

When a solution of formic acid was titrated with

KOH

solution, the

pH

of the solution was

3.65

when half the acid was neutralized. Calculate

K_{a} (HCOOH)

.

MEDIUM

JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 12 - Equilibrium>Level 1>Q 85

Nicotinic acid

(K_{a} = 1.4 \times 10^{- 5})

is represented by the formula

HNiC

. Calculate its percent dissociation in a solution which contains

0.10 mol

of nicotinic acid per

2.0 L

of solution.

MEDIUM

JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 12 - Equilibrium>Level 1>Q 86

How many times the

H^{+}

ion concentration in the blood

(pH = 7.36)

greater than in the spinal fluid

(pH = 7.53)

?

MEDIUM

JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 12 - Equilibrium>Level 1>Q 87

The degree of dissociation of acetic acid in a $0.1 N$ solution is $1.32 \times 10^{- 2}$ . At what concentration of nitrous acid will its degree of dissociation be the same as that of acetic acid?

$K_{a} for {HNO}_{2} = 4 \times 10^{- 4}$

MEDIUM

JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 12 - Equilibrium>Level 1>Q 88

At what concentration of the solution will the degree of dissociation of nitrous acid be

0.2

? (

K_{a}

for

{HNO}_{2}

is

4 \times 10^{- 4}

)

EASY

JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 12 - Equilibrium>Level 1>Q 89

Concentration of

{OH}^{-} is 1.6 \times 10^{n}

for a solution whose

pH

is

6.2

, Calculate the value of

n

to the nearest integer value.

MEDIUM

JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 12 - Equilibrium>Level 1>Q 90

For the equilibrium

{COCl}_{2} (g) ⇌ CO (g) + {Cl}_{2} (g)

is

0.329

. Suppose that

x mol

of

{COCl}_{2}

is allowed to reach equilibrium in a

1 L

container. What will be the value of

x

that must be used in order that half the chlorine atoms remain as

{COCl}_{2}

?

MEDIUM

JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 12 - Equilibrium>Level 2>Q 1

For the reaction

2 HI (g) ⇌ H_{2} (g) + I_{2} (g)

, the degree of dissociation

(α)

of

HI

is related to the equilibrium constant

K_{p}

by the expression