www.ThinkITI.com

Home
MCQ
Search
Free Apps
Important
Study Groups
Contact Us
Policy

Home
MCQ
Objective Questions
GS
GS Set-1
Chemistry
Physical Chemistry
155

Physical Chemistry MCQ with Answers

155) An aqueous solution is 1m in KI. What change will cause the vapour pressure of the solution to increase?

Addition of NaCl

Addition of Na₂SO₄

Addition of 1m KI

Addition of water

Answer is:

Addition of water

Explanation:

Addition of water to an aqueous solution of KI, causes the concentration of the solution to decrease, thereby increasing the vapour pressure.

Physical Chemistry MCQ with Answers

For more MCQ's Click Here

156) A solution of sucrose has been prepared by dissolving 68.5 gm of sucrose in 1000 gm of water. The freezing point of the solution obtained will be:

−0.372^oC

−0.520^oC

+0.372^oC

−0.570^oC

Answer is:

−0.372^oC

Explanation:

ΔT_f = K_fm

157) What is the correct order of value of a, the Vender Waal′s constant?

H₂ < He < Ar < N₂

He < H₂ < N₂ < Ar

H₂ < He < N₂ < Ar

He < H₂ < Ar < N₂

Answer is:

H₂ < He < N₂ < Ar

158) 1 mol of Ne and 1 mol of N₂ are placed in a container. Indicate the incorrect statement about this system:

Molecules of the two gases strike the wall of the container with same frequency

Molecules of Ne strike the wall more frequently

Both gases exert same pressure

N₂ has an average molecular speed

Answer is:

Molecules of the two gases strike the wall of the container with same frequency

Explanation:

The two gases have different velocities, therefore frequency of striking the wall will be different

159) Two containers of same volume containing 1 mol of O₂ and H₂, having V_rms of H₂ 2 times than that of O₂. If the two containers are connected, what will be the ratio of rate of diffusion of O₂ to H₂?

4:01

2:01

16:01

1:01

Answer is:

0.042361111

Physical Chemistry MCQ with Answers

For more MCQ's Click Here

155) An aqueous solution is 1m in KI. What change will cause the vapour pressure of the solution to increase?

Addition of water

Physical Chemistry MCQ with Answers

Related Physical Chemistry MCQ with Answers

156) A solution of sucrose has been prepared by dissolving 68.5 gm of sucrose in 1000 gm of water. The freezing point of the solution obtained will be:

−0.372oC

157) What is the correct order of value of a, the Vender Waal′s constant?

H2 < He < N2 < Ar

158) 1 mol of Ne and 1 mol of N2 are placed in a container. Indicate the incorrect statement about this system:

Molecules of the two gases strike the wall of the container with same frequency

159) Two containers of same volume containing 1 mol of O2 and H2, having Vrms of H2 2 times than that of O2. If the two containers are connected, what will be the ratio of rate of diffusion of O2 to H2?

0.042361111

Physical Chemistry MCQ with Answers

−0.372^oC

H₂ < He < N₂ < Ar

158) 1 mol of Ne and 1 mol of N₂ are placed in a container. Indicate the incorrect statement about this system:

159) Two containers of same volume containing 1 mol of O₂ and H₂, having V_rms of H₂ 2 times than that of O₂. If the two containers are connected, what will be the ratio of rate of diffusion of O₂ to H₂?