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

Answer:

(D) Anthracite coal

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Commercial vulcanization of rubber involves—
(A) sulphur
(B) carbon
(C) phosphorus
(D) selenium
Which one of the following when dissolved in H2O gives hissing sound?
(A) Limestone
(B) Slacked lime
(C) Soda lime
(D) Quicklime