Question

1. Electrolysis of water is the decomposition of water into
(a) hydrogen gas (H)) only.
(c) both hydrogen (H) and oxygen (O2).
(b) oxygen gas (O2) only.
2. Aluminium is extracted from its ore by passing an electric current through
(d) hydrogen (H,) and copper (Cu).
(a) solid bauxite (Al2O3) and cryolite (NazAlF6).
(b) fused bauxite (Al2O3) and solid cryolite (NazAlF6).
(c) copper sulphate (CuSO2) solution.
(d) fused bauxite (Al2O3) and cryolite (NazAlF6).
3. While trying to put out a fire in an electrical appliance, we should
(a) pour distilled water on it.
(b) pour rainwater on it.
(c) pour tap water on it.
(d) none of these.
4. The article to be electroplated is made
(b) the cathode.
(c) either anode or cathode.
(d) none of these.
(a) the anode.​

Answer 1

Answer:

1⃣ B

2⃣ C

3⃣ D

4️⃣ C

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Answer 2

Answer:

1.(c)

2.(a)

3.(d). (Actually, Baking soda should be used.)

4.(b)

Explanation:

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