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A certain compound (A) imparts a golden ...

A certain compound (A) imparts a golden yellow flame and exhibits following reactions:
(a). When a concentrated solution of (A) is boiled with Zn powder, hydrogen gas is evolved.
(b). When an aqueous solution of (A) is added to an aqueous solution of stannous chloride, a white precipitate is obtained, which dissolves in excess of solution (A).
Identify (A) and give equations for reactions in (a) and (b).

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`[X]=NaOH`
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