Which of the following statements is/are correct? P. Sylvine and rock salt are the ores of potassium. Q. Wood metal is used in the making of automatic sprinklers. R. Duralumin is used in the manufacturing of aeroplane parts and consists of Al, Cu, Mg and Mn.

Sylvine (KCl) and rock salt (NaCl) are the ores of potassium and sodium respectively. Wood metal consists of Bi = 50%, Pb = 25%, Sn = 12.5% & Cd = 12.5% and is used in the making of automatic sprinklers as it melts in hot water (m.p.= 68 ^oC). Duralumin is used in the manufacturing of aeroplane parts and consists of Al = 95.5%, Cu = 4%, Mg = 0.5% and Mn = 0.5%.