Which one is malachite from the following?
(1) CuFeS2
(2) Cu(OH)2
(3) Fe3O4
(4) CuCO3.Cu(OH)2
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Which of the following species is not stable? (1) [SiF6]2– (2) [GeCl6]2– (3) [Sn(OH)6]2– (4) [SiCl6]2–
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