Government CDS Question: Download Government CDS PDF

Commercial vulcanization of rubber involves—
(A) sulphur
(B) carbon
(C) phosphorus
(D) selenium

(A) sulphur

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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)	In which one of the following is higher percentage of carbon found? (A) Lignite coal (B) Peat coal (C) Bituminous coal (D) Anthracite coal