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Q)

Which one of the following cation will give a blue coloured ash when a piece of filter paper dipped in a solution containing its salt and $Co(NO_3)_2$ is burned?

(a) $Cu^{2+}$
(b) $Mg^{2+}$
(c) $Al^{3+}$
(d) $Zn^{2+}$

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