Which of the following metal (is/are) soluble in aqua-regia?
A
Pt
B
Au
C
Hg
D
All of these
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Solution
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Aqua regia is a very strong acid. It is made by mixing hydrochloric acid and nitric acid in the ratio 3:1.
It can dissolve all metals including noble metals like platinum, gold, and mercury.
So, the correct option is ( D )
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