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Chemical Reactions & Applied Chemistry question bank (Polytechnic Chemistry)

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Q1.

Refer to the Case Study 'Case Study: The Chlor-Alkali Electrochemical Process in Chemical Industry' to answer:

During the chlor-alkali process, which chemical product is evolved at the positively charged anode?

(A)

Chlorine gas ($Cl_2$)

(B)

Hydrogen gas ($H_2$)

(C)

Oxygen gas ($O_2$)

(D)

Sodium metal ($Na$)

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Q2.

Refer to the Case Study 'Case Study: The Chlor-Alkali Electrochemical Process in Chemical Industry' to answer:

What reaction occurs at the cathode during brine electrolysis?

(A)

Reduction of water/protons to evolve hydrogen gas: $2H_2O + 2e^- \rightarrow H_2 + 2OH^-$

(B)

Reduction of sodium ions to metallic sodium: $Na^+ + e^- \rightarrow Na$

(C)

Oxidation of sodium hydroxide to oxygen gas

(D)

Disproportionation of chlorate ions

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