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Aqua regia, which can dissolve gold and platinum, is a freshly prepared mixture of:
Adilute HCl and dilute H₂SO₄
BHNO₃ and NaOH solution
Cconcentrated HCl and concentrated HNO₃ in 3:1 ratio
Dconcentrated H₂SO₄ and water
Answer & Solution
Correct answer: C. concentrated HCl and concentrated HNO₃ in 3:1 ratio
Aqua regia is 3 parts conc. HCl to 1 part conc. HNO₃; it dissolves noble metals like gold.
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