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MCQ- 26
Standard reduction electrode potentials of three metals P, Q and R are +0.5 V, -3.0 V and -1.2V respectively. The order of reducing the power of these metals is
A. Q > R > P
B. R > Q > P
C. P > Q > R
D. P > R > Q

Answer: A

MCQ- 27
When HNO₃ acts as an oxidizing agent and ultimately forms NO₂, NO and HNO₂. Then the number of electrons transferred in each case
A. 1, 3, 2
B. 4, 3, 2
C. 1, 5, 3
D. 3, 5, 7

Answer: A

MCQ- 28
Incorrect statement about Galvanic cell
A. Reaction is feasible
B. Reaction is non-spontaneous
C. Allow a spontaneous reaction to occur
D. Transfer electrons from the anode to the cathode

Answer: b

MCQ- 29
Among the following molecules, which does phosphorus show the lowest oxidation number
A. HPO₃
B. PCl₃
C. PH₃
D. P₄

Answer: C

MCQ- 30
In the reaction 4Al + 3O₂ → 4Al³⁺ + 6O^2-
which of the following statement is incorrect
A. Metallic Aluminium is a reducing agent
B. Al³⁺ is an oxidizing agent
C. Metallic Aluminium is reduced to Al³⁺
D. Redox reaction

Answer: C