12. One card is drawn at random from a well-shuffled deck of 62 cards. Find the
probability that the card drawn is (i) a 4, (ii) a queen, (ii) a black card,
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In early production, first calcium cyanamide was converted into dicyandiamide, which was heated above its melting temperature to produce melamine. Today most industrial manufacturers use urea in the following reaction to produce melamine: 6 (NH2)2CO → C3H6N6 + 6 NH3 + 3 CO.
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