1
CBSE 12th Chemistry Delhi Set 1 - 2023
MCQ (Single Correct Answer)
+1
-0

Four half reactions I to IV are shown below:

I. $$2 \mathrm{Cl}^{-} \rightarrow \mathrm{Cl}_2+2 \mathrm{e}^{-}$$

II. $$4 \mathrm{OH}^{-} \rightarrow \mathrm{O}_2+2 \mathrm{H}_2 \mathrm{O}+2 \mathrm{e}^{-}$$

III. $$\mathrm{Na}^{+}+\mathrm{e}^{-} \rightarrow \mathrm{Na}$$

IV. $$2 \mathrm{H}^{+}+2 \mathrm{e}^{-} \rightarrow \mathrm{H}_2$$

Which two of these reactions are most likely to occur when concentrated brine is electrolysed?

A
I and III
B
I and IV
C
II and III
D
II and IV
2
CBSE 12th Chemistry Delhi Set 1 - 2023
MCQ (Single Correct Answer)
+1
-0

Which of the following cell was used in Apollo space programme?

A
Mercury cell
B
Daniel cell
C
$$\mathrm{H}_2-\mathrm{O}_2$$ Fuel cell
D
Dry cell
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