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Aqua regia used by alchemists to separate silver and gold is a mixture of—
(A) hydrochloric acid (concentrated) and nitric acid (concentrated)
(B) hydrochloric acid (concentrated and sulphuric acid (concentrated)
(C) nitric acid (concentrated) and sulphuric acid (concentrated)
(D) hydrochloric acid (dilute) and sulphuric acid (dilute)

(A) hydrochloric acid (concentrated) and nitric acid (concentrated)

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