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Which of the following statement(s) is/are incorrect?

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Pb, Cu, Hg, Zn , Mg and Ca metals are commercially obtained by auto – reduction

Both $[C u {(N H_{3})}_{4}] S O_{4}$ and $K_{3} [C u {(C N)}_{4}]$ have tetrahedral complex ions

Both cyclic and pyroxene silicates have same empirical formula

Polyphosphates and metaphosphates have same empirical formula

answer is C, D.

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Detailed Solution

Key:CD
Hint: i) Pb, Cu, Hg – auto reduction
ii) $K_{3} [C u {(C N)}_{4}] -$ tetrahedral; $[C u {(N H_{3})}_{4}] S O_{4}$ - square planar

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