MCQOPTIONS

Explore topic-wise MCQs in Chemistry.

This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.

1.	How are the oxides of less reactive metals like silver and mercury reduced?
A.	By thermal decomposition
B.	By electrolysis
C.	By using reducing agents
D.	Cannot be reduced
Answer» B. By electrolysis

2.	Any metal will reduce the oxide of other metals which lie below it in the Ellingham diagram.
A.	True
B.	False
Answer» C.

3.	Which of the following is false regarding the Ellingham diagram?
A.	It consists of plots of ΔfG° vs T
B.	Ellingham diagrams are based on thermodynamic concepts
C.	They do not tell us anything about the kinetics of the reduction process
D.	They do not assume reactant-product equilibrium
Answer» E.

4.	Under what condition can Al reduce MgO?
A.	Above 1000°C
B.	Below 1000°C
C.	Above 1350°C
D.	Below 1350°C
Answer» D. Below 1350°C

5.	What does the Ellingham diagram consist of?
A.	Plots of ΔfG° vs T
B.	Plots of T vs ΔfG°
C.	Plots of ΔfG° vs ΔS
D.	Plots of ΔS vs ΔfG°
Answer» B. Plots of T vs ΔfG°

6.	How can a reaction with positive ΔG be made to occur?
A.	By increasing the temperature
B.	By decreasing the temperature
C.	By coupling it with another reaction
D.	It is not possible for the reaction to occur
Answer» D. It is not possible for the reaction to occur

7.	What is the criterion of the feasibility of a reaction at any temperature?
A.	ΔG of the reaction must be positive
B.	ΔG of the reaction must be negative
C.	ΔG of the reaction must be equal to zero
D.	Does not depend on ΔG of the reaction
Answer» C. ΔG of the reaction must be equal to zero

8.	Which of the following is the correct Gibbs equation?
A.	ΔG = ΔH + TΔS
B.	ΔG = ΔH – TΔS
C.	ΔG = ΔH – 2TΔS
D.	ΔG = ΔH – 3TΔS
Answer» C. ΔG = ΔH – 2TΔS

9.	Ellingham Diagram does not give any information regarding the kinetics of the reduction process.
A.	True
B.	False
Answer» B. False