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In aqua-regia, a mixture of conc.HCl and conc. ${HNO}_{3}$ are in the ratio of

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1:3

1:4

3:1

4:1

answer is C.

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Detailed Solution

Generally, aqua-regia is a mixture of conc. HCl and conc. ${HNO}_{3}$ in the ratio of 3:1.

This is the only solution that can dissolve gold.

As the gold bangles were dissolved in aqua-regia, their weight was reduced drastically. It also dissolves other elements like platinum.

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