Chemistry Test

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Chemistry Test - 14

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Weekly Quiz Competition

Question 1
1 / -0

The potential of a hydrogen electrode dipped in a solution of pH = 10 is (H₂ is passed at 1 atm)

A
zero

B
1 V

C
3 V

D
- 0.59 V

Solution

- 0.59 V
Question 2
1 / -0

A cell utilises the reaction Zn (s) + 2H⁺(aq) $\to$ Zn²⁺ (aq) + H₂ (g). Addition of H₂SO₄ to the cathode compartment will

A
lower E and shift the equilibrium to the left

B
lower E and shift the equilibrium to the right

C
increase E and shift the equilibrium to the right

D
increase E only

Solution

increase E and shift the equilibrium to the right
Question 3
1 / -0

$Z n(s)+C l_{2}(1 a t m) \rightarrow z n^{2+}+2 C l^{-}$

$E^{0}_{c e l l}$ of the cell is $2.12 V .$ To increase $E_{c e l l}$

A
[Zn²⁺] should be increased

B
[Zn²⁺] should be decreased

C
[Cl-] should be increased

D
$P_{\mathrm{Cl}_{2}}$ should be decreased

Solution

[Zn²⁺] should be decreased
Question 4
1 / -0

Equilibrium constant of a reaction is related to

A
pressure

B
standard free energy change $\Delta G^{\circ}$

C
volume

D
None of the above

Solution

Equilibrium constant of a reaction is related tostandard free energy change $\Delta G^{\circ}$.
Question 5
1 / -0

For the reaction: $N_{2} O_{4}(g) \rightleftharpoons 2 N O_{2}(g)$, the vapour density of the mixture at 1 atmospheric pressure is 34.5

The degree of dissociation is:

A
0.5

B
0.25

C
0.33

D
0.75

Solution

The degree of dissociation is 0.33.
Question 6
1 / -0

Which of the following chemical equilibria is/are favoured by increase in temperature?

A
$N _{2} O _{4} {\rightleftarrows} 2 NO _{2}, \Delta H =+59 kJmol ^{-1}$

B
$N _{2}+3 H _{2} {\rightleftarrows} 2 NH _{3}, \Delta H =-22 kcal mol ^{-1}$

C
$2 SO _{2}+ O _{2} {\rightleftarrows} 2 SO _{3}, \Delta H =-47 kcal mol ^{-1}$

D
Both 2 and 3

Solution

$N _{2} O _{4} {\rightleftarrows} 2 NO _{2}, \Delta H =+59 kJmol ^{-1}$
Question 7
1 / -0

Directions: The following question has four choices out of which ONLY ONE is correct.

In an endothermic reaction, if k₁ and k₂ are the equilibrium constants at T₁ and T₂ temperatures respectively and if T₂ is greater than T₁ then

A
k₁ =k₂

B
k₁< k₂

C
k₁ > k₂

D
none

Solution

k₁< k₂
Question 8
1 / -0

In the reaction $2O_{3} \rightleftharpoons 3O{_2}$, the value of $Kc$ is

A
[O₃]³/[O₂]²

B
[O₃]²/[O₂]³

C
[O₂]³/[O₃]²

D
[O₂]/[O₃]

Solution

$Kc$ =[O₂]³/[O₃]²
Question 9
1 / -0

Directions: The following question has four choices out of which ONLY ONE is correct.

In the synthesis of NH₃, between N₂ and H₂ reaction, the unit of Kp is

A
atm^-2

B
lit² mol^-2

C
lit atm^-1

D
lit^-2atm^-2

Solution

Kp =atm^-2
Question 10
1 / -0

Haber & aposs process is used to manufacture

A
SO₂

B
NH₃

C
NO

D
NO₂

Solution

Haber & aposs process is used to manufactureNH₃

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Re-Attempt Weekly Quiz Competition

Chemistry Test - 14

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Chemistry Test - 14

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Question 1

zero

1 V

3 V

- 0.59 V

Solution

Question 2

lower E and shift the equilibrium to the left

lower E and shift the equilibrium to the right

increase E and shift the equilibrium to the right

increase E only

Solution

Question 3

[Zn2+] should be increased

[Zn2+] should be decreased

[Cl-] should be increased

\(P_{\mathrm{Cl}_{2}}\) should be decreased

Solution

Question 4

pressure

standard free energy change \(\Delta G^{\circ}\)

volume

None of the above

Solution

Question 5

0.5

0.25

0.33

0.75

Solution

Question 6

\(N _{2} O _{4} {\rightleftarrows} 2 NO _{2}, \Delta H =+59 kJmol ^{-1}\)

\(N _{2}+3 H _{2} {\rightleftarrows} 2 NH _{3}, \Delta H =-22 kcal mol ^{-1}\)

\(2 SO _{2}+ O _{2} {\rightleftarrows} 2 SO _{3}, \Delta H =-47 kcal mol ^{-1}\)

Both 2 and 3

Solution

Question 7

k1 =k2

k1< k2

k1 > k2

none

Solution

Question 8

[O3]3/[O2]2

[O3]2/[O2]3

[O2]3/[O3]2

[O2]/[O3]

Solution

Question 9

atm-2

lit2 mol-2

lit atm-1

lit-2 atm-2

Solution

Question 10

SO2

NH3

NO

NO2

Solution

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[Zn²⁺] should be increased

[Zn²⁺] should be decreased

k₁ =k₂

k₁< k₂

k₁ > k₂

[O₃]³/[O₂]²

[O₃]²/[O₂]³

[O₂]³/[O₃]²

[O₂]/[O₃]

atm^-2

lit² mol^-2

lit atm^-1

lit^-2atm^-2

SO₂

NH₃

NO₂