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MCQ- 36
The expression ∆E = q + W is
A. First law of the thermodynamics
B. Third law of the thermodynamics
C. Second law of thermodynamics
D. Hess’s Law

Answer: A

MCQ- 37
In an acidic medium, moles of H₂O and H⁺ are added respectively for the given reaction are
10 Cl^– + 2MnO₄^– → 2 Mn ²⁺ + 5 Cl₂
A. 4, 4
B. 8, 16
C. 8, 8
D. 4, 8

Answer: B

MCQ- 38
One joule is equal to
A. 4.184 Cal
B. 1/4.184 Cal
C. 7.60
D. 1.055 Cal

MCQ- 39
In a reaction, the oxidation number of Cu decreases by 2. This indicates that Cu is
A. Reduced
B. Neutralized
C. Oxidized
D. A reducing agent.

Answer: A

MCQ- 40
When a Zn piece is placed in CuSO₄ solution, copper gets precipitated because
A. Standard reduction potential of Zn is more than that of copper
B. Standard reduction potential of Zn is less than that of copper
C. Atomic number of Zn is larger than that of Cu
D. Atomic number of Zn is smaller than that of Cu

Answer: B