\( \mathrm{AlF}_{3} \) is soluble in \( \mathrm{HF} \) only in presence of KF. It is due to the ...

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\( \mathrm{AlF}_{3} \) is soluble in \( \mathrm{HF} \) only in presence of KF. It is due to the formation of:
(NEET 2016)
(a) \( \mathrm{K}\left[\mathrm{AlF}_{3} \mathrm{H}\right] \)
(b) \( \mathrm{K}_{3}\left[\mathrm{AlF}_{3} \mathrm{H}_{3}\right] \)
(c) \( \mathrm{K}_{3}\left[\mathrm{AlF}_{6}\right] \)
(d) \( \mathrm{AlH}_{3} \)
\( P \)
W.
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