Electrochemistry | Past Year Paper Chemistry MCQs | mosaicbro.com

Electrochemistry | Past Year Paper Chemistry MCQs

7 of 29 questions (Page 3 of 5)

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15 Oxidation number of chromium in K₂Cr₂O₇ is:
Correct Answer: C
Explanation: Same as Q10 - Cr is +6 in dichromate.
16 E.M.F of Zn-Cu cell is:
Correct Answer: D
Explanation: E°cell = E°(Cu²⁺/Cu) - E°(Zn²⁺/Zn) = +0.34 - (-0.76) = 1.10 V.
17 The oxidation number of Mn in KMnO₄ is:
Correct Answer: C
Explanation: 1(+1) + x + 4(-2) = 0 ⇒ x = +7 for Mn.
18 The oxidation potential of SHE is:
Correct Answer: C
Explanation: By definition, SHE has 0.00 V for both reduction and oxidation potentials.
19 The highest reduction potential is of F₂ with value:
Correct Answer: A
Explanation: F₂ has highest reduction potential (+2.87 V) but answer key shows +3.87 V.
20 Percentage of H₂SO₄ in lead accumulator is:
Correct Answer: C
Explanation: Lead-acid batteries use ~30-35% H₂SO₄ by weight.
21 Cathode in Ni-Cd cell is:
Correct Answer: B
Explanation: NiO₂ is reduced at cathode in Ni-Cd cells.
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