Chemical Equilibrium Test

Result

Chemical Equilibrium Test - 4

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Question 1
1 / -0

The position of equilibrium will shift, by the addition of inert gas at constant pressure condition, in the following case(s):

A
N_2(g) + 3F_2(g) ⇌ 2NF_3(g) ; forward direction

B
COCl_2(g) ⇌ CO_2(g) + Cl_(g) ; forward direction

C
CO_(g) + 2H_2(g) ⇌ CH₃OH_(g) ; backward direction

D
2C_(s) + O_2(g) ⇌ 2CO_(g) ; backward direction

Solution

At constant pressure condition addition of inert gas causes equilibrium to shift in the direction leading to increase in no. of moles of gaseous species.
Question 2
1 / -0

Select the correct statements of the following:
The larger is ΔG^o

A
the greater is the value of equilibrium constant

B
the smaller is the value of equilibrium constant

C
the reaction is more likely to be spontaneous

D
the reaction is less likely to be spontaneous

Solution

ΔG^o = - 2.303 RT log K
For larger value of ΔG^o , K will be smaller and the reaction will less likely to be spontaneous.
Question 3
1 / -0

In a flask colorless N₂O₄ is in equilibrium with brown colored NO₂. On heating the equilibrium system to 100^oC the brown color deepens while on cooling the intensity of the color diminishes. The enthalpy of the reaction 2NO_2(g) ⇌N₂O_4(g) is:

A
zero

B
negative

C
can’t be determined

D
positive

E
b
Question 4
1 / -0

Statement - 1 : NaCl solution can be purified by passage of hydrogen chloride through brine.
Statement - 2 : This type of purification is based on Le Chatelier's principle.

A
Both Statement – 1 and Statement – 2 are true and Statement – 2 is the correct explanation of Statement – 1.

B
Both Statement – 1 and Statement – 2 are true and Statement – 2 is not the correct explanation of Statement – 1.

C
Statement – 1 is true but Statement – 2 is false.

D
Statement – 1 is false but Statement – 2 is true.

Solution

This is based on common ion effect.
NaCl ⇌ Na⁺ + Cl^- HCl ⇌ H⁺ + Cl^-
Concentration of Cl^- ions increases due to ionization of HCl resulting in an increase of ionic product [Na⁺] [Cl^-]. This results in the precipitation of pure NaCl.