White crystalline solid \( (A) \) reacts with \( \mathrm{H}_{2} \) to form a highly associated l...

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White crystalline solid \( (A) \) reacts with \( \mathrm{H}_{2} \) to form a highly associated liquid \( (B) \) and a monoatomic colorless gas \( (C) \). The liquid \( (B) \) is used for etching glass. Compound \( (A) \) undergoes hydrolysis slowly to form \( (C),(B) \), and a diatomic gas \( (D) \) whose IE is almost similar to that of \( (C),(B) \) forms an addition compound with KF to form \( (E) \) which is electrolyzed in the molten state to form a most reactive gas \( (F) \) which combines with \( (C) \) in \( 1: 1 \) ratio to produce \( (A) \).

The liquid \( B \) combines with which of the following to form a magic or superacid?
(a) \( \mathrm{SbF}_{5} \)
(b) \( \mathrm{XeF}_{2} \)
(c) \( \mathrm{H}_{2} \mathrm{O} \)
(d) \( \mathrm{BF}_{3} \)
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