99 Percentile Qs Bank for JEE MainChemistryd and f Block Elements

What is the final chemical form of Gold (Au) when it is dissolved in aqua-regia?

Options

AAu
BAuCl
CAuCl ₂
D[ AuCl ₄ ]⁻

Correct answer

D. [ AuCl ₄ ]⁻

Step-by-step solution

When gold (Au) dissolved in aqua-regia, it forms chloroauric ( HAuCl ₄ ) ion. It will react very slowly with chlorin gas at room temperature to form gold chloride. We know that aqua-regia is Au + HCl + HNO ₃ 3 Cl + HNO ₃ . HuCl ₄ ]⁻

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