ALL IN ONE ISC Chemistry CLASS 11>Chapter 7 - Equilibrium>Chapter Practice>Q 19

HARD

11th ICSE

IMPORTANT

Earn 100

When sulphur in the form of $S_{8}$ is heated at $900 K$ , the initial pressure of $1 atm$ falls by $29 %$ at equilibrium. This is because of conversion of $S_{8}$ to $S_{2}$ . Calculate the equilibrium constant for the reaction.

Important Questions on Equilibrium

HARD

11th ICSE

IMPORTANT

ALL IN ONE ISC Chemistry CLASS 11>Chapter 7 - Equilibrium>Chapter Practice>Q 20

An equilibrium system for the reaction between hydrogen and iodine to give hydrogen iodide at

670 K

in a

5 L

flask contains

0.4 mole

of hydrogen,

0.4 mole

of iodine and

2.4 moles

of hydrogen iodide. Calculate equilibrium constant.

HARD

11th ICSE

IMPORTANT

ALL IN ONE ISC Chemistry CLASS 11>Chapter 7 - Equilibrium>Chapter Practice>Q 21

The

pH

of a solution obtained by dissolving

0.025 mole

of an acid (

HA

) in

250 mL

of the aqueous solution was found to be

4.0

. Calculate the dissociation constant of

HA

.

HARD

11th ICSE

IMPORTANT

ALL IN ONE ISC Chemistry CLASS 11>Chapter 7 - Equilibrium>Chapter Practice>Q 22

$0.16 g$ of $N_{2} H_{4}$ are dissolved in water and the total volume made up to $500 mL$ . Calculate the percentage of $N_{2} H_{4}$ that has reacted with water in this solution. The $K_{b}$ for $N_{2} H_{4}$ is $4.0 \times 10^{- 6} M$ .

HARD

11th ICSE

IMPORTANT

ALL IN ONE ISC Chemistry CLASS 11>Chapter 7 - Equilibrium>Chapter Practice>Q 23

For the reaction,

2 NO (g) ⇌ N_{2} (g) + O_{2} (g)

;

ΔH = - ve

;

K = 2.5 \times 10^{20}

at

298 K

. What will happen to concentration of

N_{2}

if concentration of

NO

is increased?

HARD

11th ICSE

IMPORTANT

ALL IN ONE ISC Chemistry CLASS 11>Chapter 7 - Equilibrium>Chapter Practice>Q 23

For the reaction,

2 NO (g) ⇌ N_{2} (g) + O_{2} (g)

;

ΔH = - ve

;

K = 2.5 \times 10^{20}

at

298 K

. What will happen to concentration of

N_{2}

temperature is decreased to

273 K

?

HARD

11th ICSE

IMPORTANT

ALL IN ONE ISC Chemistry CLASS 11>Chapter 7 - Equilibrium>Chapter Practice>Q 23

For the reaction, $2 NO (g) ⇌ N_{2} (g) + O_{2} (g)$ ; $ΔH = - ve$ ; $K = 2.5 \times 10^{20}$ at $298 K$ . What will happen to concentration of $N_{2}$ if pressure is reduced also explain your answer?

HARD

11th ICSE

IMPORTANT

ALL IN ONE ISC Chemistry CLASS 11>Chapter 7 - Equilibrium>Chapter Practice>Q 24

Calculate degree of hydrolysis and

pH

of

0.25 M NaCN

solution at

25 ° C

.

K_{a} = 4.8 \times 10^{- 10}

HARD

11th ICSE

IMPORTANT

ALL IN ONE ISC Chemistry CLASS 11>Chapter 7 - Equilibrium>Chapter Practice>Q 25

Show that the degree of hydrolysis of a salt of weak acid and weak base is independent of concentration of the salt.