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Question:

What is X in the following reaction?

K2SO4

K2S2O3

K2S2O4

K2S2O8

Solution:

KHSO4 + F2 → HF + K2S2O8
This reaction takes place at room temperature.
The compound X is potassium persulphate.
Hence, option D is correct.
KHSO4 + F2 → HF + K2S2O8