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Chemistry Past Questions and Answers

Waec Chemistry Questions

Question 1366:

Which of the following substances is a non-electrolyte?

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A H₂SO₄
B CH₃COOH
C C₆H₁₂O₆
D NH₄Cl

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Question 1367:

The oxidation number of sulphur is +4 in

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A Na₂S>₂O₃
B H₂SO₃
C H₂SO₄
D SO₃

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Question 1368:

Consider the following ionic equation:
Cr₂O₇^2- + 14H⁺ + ne^- \(\to\) 2Cr³⁺ + 7H₂O.
The value of n in the equation is_______?

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A 7
B 6
C 3
D 2

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Question 1369:

Consider the following half-cell reactions.
Al_(s) \(\to\) Al³⁺_(aq) + 3e^-
Cu²⁺_(aq) + 2e^- \(\to\) Cu_(s)
The overall equation for the reaction is

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A Al_(s) + Cu²⁺_(aq) \(\to\) Al³⁺_(aq) + Cu_(s)
B 2Al_(s) + Cu²⁺_(aq) \(\to\) 2Al_(aq) + Cu_(s)
C 2Al_(s) + 3Cu²⁺_(aq) \(\to\) 3Cu_(s) + 2Al³⁺_(aq)
D 3Al_(s) + 2Cu²⁺_(aq) \(\to\) Cu_(s) + 3Al³⁺_(aq)

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Question 1370:

Amino acids are obtained from proteins by

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A Hydrolysis
B Oxidation
C Polymerization
D Reduction

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