Chemistry multiple-choice(Topic: Redox reactions)

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Possible material to make metal Y: Magnseium, Zinc, Nickel, Silver

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Silver

Front

In which of the following cases will there be electrons flowing in the external circuit? Options: Anode: Zinc ;Cathode: Copper; electrolyte: sugar solution, Anode: Copper ;Cathode: Copper; electrolyte: salt solution, Anode: Zinc ;Cathode: Copper; electrolyte: NaCl solution, Anode: Copper ;Cathode: Copper; electrolyte: NaCl solution

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Anode: Zinc ;Cathode: Copper; electrolyte: NaCl solution

Front

Oxidation number change of chromium (Cr) in the reaction of chromite (FeCr₂O₄) with sodium carbonate in the air.

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+2 to +6

Front

Consider the ionic equation of a redox reaction: 2MnO^4-(aq) + xH⁺(aq) + yH₂S(aq) -> 2Mn²⁺(aq) + zH₂O(l) + yS(s). What is the value of y?

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5

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Front

Back

(1) and (3) only

Front

Which process will NOT produce a gas at the anode?\n- Electrolysis of silver nitrate solution using silver electrodes\n- Electrolysis of dilute sulphuric acid using platinum electrodes\n- Electrolysis of dilute sodium chloride solution using carbon electrodes\n- Electrolysis of concentrated sodium chloride solution using mercury cathode and carbon anode

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Electrolysis of silver nitrate solution using silver electrodes

Front

Which of the following statements concerning the above set-up are correct?
(1) Lead(II) ions are oxidized.
(2) The experiment should be performed in a fume cupboard.
(3) A reddish brown gas is given off at the anode.

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(2) The experiment should be performed in a fume cupboard.
(3) A reddish brown gas is given off at the anode.

Front

Electrolysis of unknown solution Y was carried out using Hofmann voltameter. The gas produced at anode & cathode was in the ratio of 1:2. (Both the electrodes of anode & cathode are graphite) Which solution is possible to be solution Y? Options: concentrated NaCl solution, dilute CuSO₄ solution, concentrated MgCl₂ solution, dilute sulphuric acid

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dilute sulphuric acid

Front

Assertion-reason question: 1st statement: In an electrolytic cell, reduction is carried at the anode. 2nd statement: During electrolysis, negative ions are attracted to the anode.

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The 1st statement is false but the 2nd statement is true.