Question

Which of the following metal ion forms unstable complex with CN^-? (a) Ag(I) (b) Zn(II) (c) Cu(II) (d) Cr(II)

Answer 1

Cu (II)

because it is more stable in +2 state then in +1 state, which it is converted for to reaction with CN as carbon forum three books with nitrogen and one bond with Cu, making it rather unstable

Answer 2

Cr(II) is a metal ion forms unstable complex with $CN^-$.

Explanation:

• Cr denotes chromium. It is a heavy metal present in the nature. Its atomic number is 24.

• Chromium II reacts with Cyanide and forms Chromium II cyanide.

• Its molecular formula is $Cr(CN)_2$.

• Chromium and cyanide ion react with each other and produces a gelatinous precipitate.

• CN is the chemical formula of cyanide.

• In Cyanide, carbon and nitrogen are joined by covalent bonds.

• The carbon atom makes a triple bond with nitrogen atom (C≡N).

Learn more about metal ion

Salts of which alkali do not contain metal ion? Support your answer with suitable reaction.

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Total charge on 1 mole of a monovalent metal ion is equal to

(a) 9.65 × 10⁴ coulombs

(b) 1.6 × 10⁻¹⁹ coulombs

(c) 6.2 × 10¹⁸ coulombs

(d) None of these

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