Identify the type of reaction: CuSO₄ + Fe → FeSO₄ + Cu. MCQ with Answer and Explanation

Identify the type of reaction: CuSO₄ + Fe → FeSO₄ + Cu.
A. Decomposition
B. Displacement
C. Combination
D. Double displacement
Answer: Option B
Solution (By JKSSB Mock Tests)
This is a single displacement reaction. Iron (Fe) is more reactive than Copper (Cu), so it displaces copper from its aqueous sulfate solution. The blue color of CuSO₄ fades, and a brown deposit of Cu forms. Reactivity series dictates that a more reactive metal displaces a less reactive one.

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Practice More chemistry Questions

Question #1
In the reaction 2FeCl₃ + H₂S → 2FeCl₂ + 2HCl + S, the reducing agent is:
A. HCl
B. FeCl₃
C. H₂S
D. FeCl₂

Correct Answer: Option C


Explanation:
H₂S is oxidized (S²⁻ → S, loss of electrons), so it acts as the reducing agent. FeCl₃ is reduced (Fe³⁺ → Fe²⁺) and acts as oxidizing agent. The substance oxidized is the reducing agent.

This question belongs to: Science chemistry
Question #2
Cement sets into a hard mass when mixed with water due to:
A. Hydration and crystallization of silicates and aluminates
B. Evaporation of water
C. Oxidation
D. Polymerization

Correct Answer: Option A


Explanation:
Cement undergoes hydration reactions: water reacts with cement compounds (C₃S, C₂S, C₃A) to form complex hydrated silicates and aluminates (e.g., C-S-H gel) along with Ca(OH)₂. This process causes setting and hardening, forming a rigid, rock-like mass. It is exothermic. Gypsum controls initial setting. Proper curing is necessary for strength development.

This question belongs to: Science chemistry
Question #3
Which of the following methods is used to obtain pure copper from impure copper?
A. Roasting
B. Electrolytic refining
C. Smelting
D. Calcination

Correct Answer: Option B


Explanation:
In electrolytic refining, impure copper is the anode, pure copper is the cathode, and CuSO₄ acidified with H₂SO₄ is the electrolyte. Copper dissolves from anode and pure copper deposits on cathode. Smelting is reduction with coke.

This question belongs to: Science chemistry