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Comprehension-9: (Q. 31 to Q. 33)
A colorless mixture of two salts \( (A) \) and \( (B) \) [excess]
\( \mathrm{P} \) is soluble in \( \mathrm{H}_{2} \mathrm{O} \). (A) turns blue litmus red and \( (B) \) turns red litmus blue. \( (A) \) gives white ppt with \( (B) \)
W. which dissolves in excess of \( (B) \) forming \( (C) \). \( (A) \) when
placed in atmosphere gives fumes and can form dimer.
(A) gives white ppt with \( \mathrm{NH}_{4} \mathrm{Cl} \), and \( \mathrm{NH}_{4} \mathrm{OH} \) soluble in \( (B) \).
Identify \( A \) :
(a) \( \mathrm{AlCl}_{3} \)
(b) \( \mathrm{ZnCl}_{2} \)
(c) \( \mathrm{FeCl}_{3} \)
(d) None of these
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