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A sodium salt of an unknown anion when treated with MgCl2 gives white precipitate only on boiling. The anion is

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A sodium salt of an unknown anion when treated with MgCl2 gives white precipitate only on boiling. The anion is

(a) SO2-4

(b) HCO-3

(c) CO2-3

(d) NO-3

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Best answer

The correct option (b) HCO-3

Explanation:

A sodium salt of an unknown anion when treated with MgCl2 gives white precipitate (MgCO3) only on boiling. The anion is HCO-3 ion.

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