Equilibrium - Physical Chemistry - Chemistry Previous Year Questions

1

2009 · Chemistry · Physical Chemistry · Equilibrium

Chemistry (CY) 2009

Among the following, the reaction that is accompanied by a decrease in the entropy is

A

N₂(g) + 3H₂(g) → 2NH₃(g)

B

C₆H₁₂O₆(s) + 6O₂(g) → 6CO₂(g) + 6H₂O(l)

C

PCl₅(s) → PCl₃(l) + Cl₂(g)

D

2H₂O(l) → 2H₂(g) + O₂(g)

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2

2009 · Chemistry · Physical Chemistry · Equilibrium

Chemistry (CY) 2009

In the reaction HSO₄^-(aq) + OH^-(aq) ⇌ SO₄^2-(aq) + H₂O(l), the conjugate acid-base pairs are

A

HSO₄^- and SO₄^2-; H₂O and OH^-

B

HSO₄^- and H₃O⁺; SO₄^2- and OH^-

C

HSO₄^- and OH^-; SO₄^2- and H₂O

D

HSO₄^- and OH^-; SO₄^2- and H₃O⁺

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3

2009 · Chemistry · Physical Chemistry · Equilibrium

Chemistry (CY) 2009

Given that the standard molar enthalpies of formation of NO(g) and NO₂(g) are, respectively, 90.3 kJ mol^-1 and 33.2 kJ mol^-1, the enthalpy change for the reaction 2NO(g) + O₂(g) → 2NO₂(g) is

A

16.6 kJ

B

-57.1 kJ

C

-114.2 kJ

D

57.1 kJ

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4

2009 · Chemistry · Physical Chemistry · Equilibrium

Chemistry (CY) 2009

Among the following, the equilibrium which is NOT affected by an increase in pressure is

A

2SO₂(g) ⇌ 2SO₃(g) + O₂(g)

B

H₂(g) + I₂(s) ⇌ 2HI(g)

C

C(s) + H₂O(g) ⇌ CO(g) + H₂(g)

D

3Fe(s) + 4H₂O(g) ⇌ Fe₃O₄(s) + 4H₂(g)

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5

2009 · Chemistry · Physical Chemistry · Equilibrium

Chemistry (CY) 2009

The free energy change (ΔG) of 1 mole of an ideal gas that is compressed isothermally from 1 atm to 2 atm is

A

RTln2

B

-2RT

C

-RTln2

D

2RT

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6

2011 · Chemistry · Physical Chemistry · Equilibrium

Chemistry (CY) 2011

\(\left(\frac{\partial G}{\partial p}\right)_T =\)

A

V

B

S

C

-S

D

-V

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7

2011 · Chemistry · Physical Chemistry · Equilibrium

Chemistry (CY) 2011

The ideal molar ratio of Na₂HPO₄ to NaH₂PO₄ is

A

4:1

B

1:4

C

3:2

D

2:3

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8

2012 · Chemistry · Physical Chemistry · Equilibrium

Chemistry (CY) 2012

There are eight bags of rice looking alike, seven of which have equal weight and one is slightly heavier. The weighing balance is of unlimited capacity. Using this balance, the minimum number of weighings required to identify the heavier bag is

A

2

B

3

C

4

D

8

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9

2013 · Chemistry · Physical Chemistry · Equilibrium

Chemistry (CY) 2013

Consider the reaction $2C(s) + O_2(g) \rightleftharpoons 2CO(g)$ at equilibrium. The equilibrium can be shifted towards the forward direction by

A

increasing the amount of carbon in the system.

B

decreasing the volume of the system.

C

decreasing the pressure of the system.

D

increasing the temperature of the system.

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10

2013 · Chemistry · Physical Chemistry · Equilibrium

Chemistry (CY) 2013

A sparingly soluble electrolyte $M_2X$ ionizes as $M_2X \rightleftharpoons 2M^+ + X^{2-}$. The solubility product ($K_{sp}$), molal solubility ($S$) and mean molal activity coefficient ($\gamma_\pm$) are related by

A

K_{sp} = S^2 \gamma_\pm^2

B

K_{sp} = S^3 \gamma_\pm^3

C

K_{sp} = 4S^3 \gamma_\pm^2

D

K_{sp} = 4S^3 \gamma_\pm^3

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11

2013 · Chemistry · Physical Chemistry · Equilibrium

Chemistry (CY) 2013

For the reaction X₂O₄(l) ⟶ 2XO₂(g) at 298 K, given the values, ΔU = 9 kJ and ΔS = 84 J K^-1, ΔG is

A

-11.08 kJ

B

+11.08 kJ

C

-13.55 kJ

D

+13.55 kJ

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12

2013 · Chemistry · Physical Chemistry · Equilibrium

Chemistry (CY) 2013

The value of log10(Ksp) for Fe(OH)3 at 298 K is

A

-38.2

B

+87.6

C

-96.0

D

-87.6

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13

2013 · Chemistry · Physical Chemistry · Equilibrium

Chemistry (CY) 2013

If 3 ≤ X ≤ 5 and 8 ≤ Y ≤ 11 then which of the following options is TRUE?

A

\(\frac{3}{5} \leq \frac{X}{Y} \leq \frac{8}{5}\)

B

\(\frac{3}{11} \leq \frac{X}{Y} \leq \frac{5}{8}\)

C

\(\frac{3}{11} \leq \frac{X}{Y} \leq \frac{8}{5}\)

D

\(\frac{3}{5} \leq \frac{X}{Y} \leq \frac{8}{11}\)

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14

2014 · Chemistry · Physical Chemistry · Equilibrium

Chemistry (CY) 2014

The maximum non-PV work that a system can perform at constant P is

A

ΔH

B

ΔG

C

ΔS

D

ΔA

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15

2014 · Chemistry · Physical Chemistry · Equilibrium

Chemistry (CY) 2014

Consider the reaction:
A + B ⇌ C
The unit of the thermodynamic equilibrium constant for the reaction is

A

mol L^-1

B

L mol^-1

C

mol² L^-2

D

dimensionless

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16

2014 · Chemistry · Physical Chemistry · Equilibrium

Chemistry (CY) 2014

A Carnot engine operates at 55% efficiency. If the temperature of reject steam is 105 °C, then the absolute temperature of input steam is ______________

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17

2016 · Chemistry · Physical Chemistry · Equilibrium

Chemistry (CY) 2016

At pH 7.2 and 10 Torr oxygen partial pressure, the extent of O2 binding is

A

high for both hemoglobin and myoglobin

B

high for hemoglobin and low for myoglobin

C

high for myoglobin and low for hemoglobin

D

low for both hemoglobin and myoglobin

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18

2016 · Chemistry · Physical Chemistry · Equilibrium

Chemistry (CY) 2016

One mole of an ideal gas is compressed from 5 L to 2 L at constant temperature. The change in entropy, in J K^-1, of the gas is __________. (R = 8.314 J K^-1 mol^-1)

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19

2016 · Chemistry · Physical Chemistry · Equilibrium

Chemistry (CY) 2016

The titration of a strong acid with a strong base is represented by the plot

A

B

C

D

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20

2016 · Chemistry · Physical Chemistry · Equilibrium

Chemistry (CY) 2016

Of the following inequalities, the criterion/criteria for spontaneity of a chemical reaction is/are (i) (ΔG)T,P < 0 (ii) (ΔU)S,V > 0 (iii) (ΔS)U,V > 0

A

(i) only

B

(ii) only

C

(i) and (ii)

D

(i) and (iii)

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