11th Chemistry Weekly Test - 1 ( Physical and Chemical Equilibrium )

MABS Institution

11th Chemistry Weekly Test - 1 ( Physical and Chemical Equilibrium )-Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

[Co(H₂O)₆]²⁺ (aq) (pink) + 4Cl^- (aq) u21cc [CoCl₄]^2-(aq) (blue)+ 6 H₂O (l)
In the above reaction at equilibrium, the reaction mixture is blue in colour at room temperature. On cooling this mixture, it becomes pink in colour. On the basis of this information, which one of the following is true?

ΔH > 0 for the forward reaction
ΔH = 0 for the reverse reaction
ΔH < 0 for the forward reaction
Sign of the ΔH cannot be predicted based on this information

The equilibrium constant for a reaction at room temperature is K1 and that at 700 K is K2. If K1 > K2, then

The forward reaction is exothermic
The forward reaction is endothermic
The reaction does not attain equilibrium
The reverse reaction is exothermic

Which of the following is an example of heterogeneous equilibrium?

Synthesis of HI
Dissociation of PCl₅
Acid hydrolysis of ester
Decomposition of limestone

Find the Q value of the reaction H₂(g) + I₂(g) u21cc 2HI(g) at an instant where concentration of H₂,I₂and HI are found to be 0.2 mol L^-1, 0.2 mol L^-1,and 0.6 mol L^-1 respectively.

K_p is how many times equal to Kc for the given reaction?
\(N_{ 2\left( g \right) }+3{ H }_{ 2\left( g \right) }\rightleftharpoons 2NH_{ 3\left( g \right) }\)

\(\cfrac { 1 }{ { R }^{ 2 }{ T }^{ 2 } } \)
R²T²
\(\cfrac { R }{ T } \)
RT

At 500K, equilibrium constant K_c for the following reaction is 5, \(\frac { 1 }{ 2 } { H }_{ 2 }(g)+\frac { 1 }{ 2 } { I }_{ 2 }(g)\leftrightharpoons { H }I(g)\) what would be the equilibrium constant Kc for the reaction 2HI(g) u21cc H₂(g) + I₂(g)

0.44
0.04
25
2.5

For reaction, \(2A+B\rightleftharpoons 2C,\quad K=x\) . Equilibrium constant for \(C\rightleftharpoons A+1/2B\) will be

x
\(\cfrac { x }{ 2 } \)
\(\cfrac { 1 }{ \sqrt { x } } \)
\(\sqrt { x } \)

Which of the following will change the value of Choose the correct statement?

Catalyst decreases the activation energy
Catalyst decreases the time of attainment of equilibrium
Catalyst increases the rate of reaction
All are correct

What is the correct expression for the representation of the solubility product constant of Ag₂CrO₄?

[Ag⁺]² [CrO₄²]
[2Ag⁺] [crO₄²]
[Ag⁺] [CrO₄^2-]
[2Ag⁺]² [crO₄²]

For the reaction AB (g) \(\leftrightharpoons\) A(g) + B(g), at equilibrium, AB is 20% dissociated at a total pressure of P, The equilibrium constant K_P is related to the total pressure by the expression

P = 24 K_P
P = 8 K_P
24 P = K_P
none of these

Part - B

Generic 2 - Answer All Question

Ice melts slowly at higher altitudes. Explain why?

When the numerical value of the reaction quotient (Q) is greater than the equilibrium constant (K), in which direction does the reaction proceed to reach equilibrium?

Which of the following reactions involve homogeneous equilibrium and which involve heterogeneous equilibrium?
(i) \({ Ag }_{ 2 }{ O }_{ \left( s \right) }+2HN{ O }_{ 3\left( aq \right) }\rightleftharpoons 2Ag{ NO }_{ 3\left( aq \right) }+{ H }_{ 2 }O\)
(ii) \({ C }_{ \left( s \right) }+{ CO }_{ 2\left( g \right) }\rightleftharpoons { 2CO }_{ \left( g \right) }\)
(iii) \({ CH }_{ 3 }COO{ C }_{ 2 }{ H }_{ 5\left( aq \right) }+{ H }_{ 2 }{ O }_{ \left( l \right) }\rightleftharpoons { CH }_{ 3 }{ COOH }_{ \left( aq \right) }+{ C }_{ 2 }{ H }_{ 5 }OH_{ \left( aq \right) }\)
(iv) \({ 2SO }_{ 2\left( g \right) }+{ O }_{ 2 }\rightleftharpoons { 2SO }_{ 3 }\)
Explain how the equilibrium constant Kc predict the extent of a reaction.

Write a balanced chemical equation for a equilibrium reaction for which the equilibrium constant is given by expression
\(K_c={[NH_3]^4[O_2]^5\over [NO]^4[H_2O]^6}\)

Part - C

Generic 3 - Answer All Question

Give the relationship between K_P and K_C for the follewing cases With example.
(i) \(\Delta { n }_{ g }=+ve\) (ii) \(\Delta { n }_{ g }=-ve\) (iii) \(\Delta { n }_{ g }=0\)

Dihydrogen gas used in Haber's process is produced by reacting methane from natural gas with high temperature starn. The first stage of two stage reaction involves the formation of CO and H₂. In Second stage, CO formed in first stage is reacted with more steam in water gas shift reaction.
CO(g) + H₂O(g) u21cc CO₂(g) + H₂(g)
If a reaction vessel at 400°C is charged with an equimolar mixture of CO and steam so that Pco = P_H2O = 4.0 bar, what will be the partial pressure of H₂ at equilibrium? Kp = 0.1 at 400^oC.

The following concentration were obtained for the formation of NH₃ from N₂ and H₂ at equilibrium at 500 K.
N₂ (g)] = 1.5 x 10^-2 M
[H₂ (g)] = 3.0 x 10^-2 M
[NH₃] = 1.2 x 10^-2 M.
u200bu200bu200bu200bu200bu200bu200bCalculate equilibrium constant

The value of K_c for the following reaction at 717 K is 48.
Find out the value of Kc for each of the following equilibria from the value of K_p ?
(i) \(2NOC1_{ \left( g \right) }\rightleftharpoons 2NO_{ \left( g \right) }+{ Cl }_{ 2\left( g \right) }\);\({ K }_{ p }=2.1\times 10^{ -2 }at\quad 500K\)
(ii) \({ CaCO }_{ 3\left( s \right) }\rightleftharpoons { CaO }_{ \left( s \right) }+{ CO }_{ 2\left( g \right) }\);K_p = 165 at 1073 K.

Part - D

Generic 5 - Answer All Question

Derive the K_p and K_c for the following equilibrium reaction.
\({ H }_{ 2\left( g \right) }+{ I }_{ 2\left( g \right) }\rightleftharpoons { 2HI }_{ \left( g \right) }\)

Derive the values of K_C and K_P, for the synthesis of Hl.

PCI₅' PCl₃ and Cl₂are at equilibrium at 500 K and having concentration 1.59M PCI₃, 1.59M Cl₂ and 1.41M PCI₅"Calculate Kc for the reaction PCI₅ u21cc PCl₃+ Cl_2.

(i) Describe the effect of
(a) addition of H₂,
(b) addition of CH₃0H
(c) removal of CO
(d) removal ofCH₃OH on the equilibrium of
the reaction, \({ 2H }_{ 2(g) }+{ CO }_{ (g) }\rightleftharpoons { CH }_{ 3 }{ OH }_{ (g) }\)
(ii) What happens to an equilibrium in a reversible reaction if a catalyst is added to it?
Explain: How does the extent of reaction depend on K_c?

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11th Chemistry Weekly Test - 1 ( Physical and Chemical Equilibrium )

MABS Institution

11th Chemistry Weekly Test - 1 ( Physical and Chemical Equilibrium )-Aug 2020

Part - A

Multiple Choice Question - Answer All Question

[Co(H2O)6]2+ (aq) (pink) + 4Cl- (aq) u21cc [CoCl4]2-(aq) (blue)+ 6 H2O (l) In the above reaction at equilibrium, the reaction mixture is blue in colour at room temperature. On cooling this mixture, it becomes pink in colour. On the basis of this information, which one of the following is true?

The equilibrium constant for a reaction at room temperature is K1 and that at 700 K is K2. If K1 > K2, then

Which of the following is an example of heterogeneous equilibrium?

Find the Q value of the reaction H2(g) + I2(g) u21cc 2HI(g) at an instant where concentration of H2,I2and HI are found to be 0.2 mol L-1, 0.2 mol L-1,and 0.6 mol L-1 respectively.

K p is how many times equal to Kc for the given reaction? \(N_{ 2\left( g \right) }+3{ H }_{ 2\left( g \right) }\rightleftharpoons 2NH_{ 3\left( g \right) }\)

At 500K, equilibrium constant Kc for the following reaction is 5, \(\frac { 1 }{ 2 } { H }_{ 2 }(g)+\frac { 1 }{ 2 } { I }_{ 2 }(g)\leftrightharpoons { H }I(g)\) what would be the equilibrium constant Kc for the reaction 2HI(g) u21cc H2(g) + I2(g)

For reaction, \(2A+B\rightleftharpoons 2C,\quad K=x\) . Equilibrium constant for \(C\rightleftharpoons A+1/2B\) will be

Which of the following will change the value of Choose the correct statement?

What is the correct expression for the representation of the solubility product constant of Ag2CrO4?

For the reaction AB (g) \(\leftrightharpoons\) A(g) + B(g), at equilibrium, AB is 20% dissociated at a total pressure of P, The equilibrium constant KP is related to the total pressure by the expression

Part - B

Generic 2 - Answer All Question

Ice melts slowly at higher altitudes. Explain why?

When the numerical value of the reaction quotient (Q) is greater than the equilibrium constant (K), in which direction does the reaction proceed to reach equilibrium?

Explain how the equilibrium constant Kc predict the extent of a reaction.

Write a balanced chemical equation for a equilibrium reaction for which the equilibrium constant is given by expression \(K_c={[NH_3]^4[O_2]^5\over [NO]^4[H_2O]^6}\)

Part - C

Generic 3 - Answer All Question

Give the relationship between KP and KC for the follewing cases With example. (i) \(\Delta { n }_{ g }=+ve\) (ii) \(\Delta { n }_{ g }=-ve\) (iii) \(\Delta { n }_{ g }=0\)

The following concentration were obtained for the formation of NH3 from N2 and H2 at equilibrium at 500 K. N2 (g)] = 1.5 x 10-2 M [H2 (g)] = 3.0 x 10-2 M [NH3] = 1.2 x 10-2 M. u200bu200bu200bu200bu200bu200bu200bCalculate equilibrium constant

The value of Kc for the following reaction at 717 K is 48.

Part - D

Generic 5 - Answer All Question

Derive the Kp and Kc for the following equilibrium reaction. \({ H }_{ 2\left( g \right) }+{ I }_{ 2\left( g \right) }\rightleftharpoons { 2HI }_{ \left( g \right) }\)

Derive the values of KC and KP, for the synthesis of Hl.

PCI5' PCl3 and Cl2 are at equilibrium at 500 K and having concentration 1.59M PCI3 , 1.59M Cl2 and 1.41M PCI5"Calculate Kc for the reaction PCI5 u21cc PCl3 + Cl2.

Explain: How does the extent of reaction depend on Kc?

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Find the Q value of the reaction H₂(g) + I₂(g) u21cc 2HI(g) at an instant where concentration of H₂,I₂and HI are found to be 0.2 mol L^-1, 0.2 mol L^-1,and 0.6 mol L^-1 respectively.

K_p is how many times equal to Kc for the given reaction?
\(N_{ 2\left( g \right) }+3{ H }_{ 2\left( g \right) }\rightleftharpoons 2NH_{ 3\left( g \right) }\)

At 500K, equilibrium constant K_c for the following reaction is 5, \(\frac { 1 }{ 2 } { H }_{ 2 }(g)+\frac { 1 }{ 2 } { I }_{ 2 }(g)\leftrightharpoons { H }I(g)\) what would be the equilibrium constant Kc for the reaction 2HI(g) u21cc H₂(g) + I₂(g)

What is the correct expression for the representation of the solubility product constant of Ag₂CrO₄?

For the reaction AB (g) \(\leftrightharpoons\) A(g) + B(g), at equilibrium, AB is 20% dissociated at a total pressure of P, The equilibrium constant K_P is related to the total pressure by the expression

Write a balanced chemical equation for a equilibrium reaction for which the equilibrium constant is given by expression
\(K_c={[NH_3]^4[O_2]^5\over [NO]^4[H_2O]^6}\)

Give the relationship between K_P and K_C for the follewing cases With example.
(i) \(\Delta { n }_{ g }=+ve\) (ii) \(\Delta { n }_{ g }=-ve\) (iii) \(\Delta { n }_{ g }=0\)

The following concentration were obtained for the formation of NH₃ from N₂ and H₂ at equilibrium at 500 K.
N₂ (g)] = 1.5 x 10^-2 M
[H₂ (g)] = 3.0 x 10^-2 M
[NH₃] = 1.2 x 10^-2 M.
u200bu200bu200bu200bu200bu200bu200bCalculate equilibrium constant

The value of K_c for the following reaction at 717 K is 48.

Derive the K_p and K_c for the following equilibrium reaction.
\({ H }_{ 2\left( g \right) }+{ I }_{ 2\left( g \right) }\rightleftharpoons { 2HI }_{ \left( g \right) }\)

Derive the values of K_C and K_P, for the synthesis of Hl.

PCI₅' PCl₃ and Cl₂are at equilibrium at 500 K and having concentration 1.59M PCI₃, 1.59M Cl₂ and 1.41M PCI₅"Calculate Kc for the reaction PCI₅ u21cc PCl₃+ Cl_2.

Explain: How does the extent of reaction depend on K_c?