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  4. Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere?

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Q. Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere?

JEE MainJEE Main 2021The d-and f-Block Elements

Solution:

(1) $CuCl _{2}+ nH _{2} O \rightarrow \underset{\text{blue colour}}{Cu _{(\text {aq. })}^{+2}}$
(2) $AgCl + nH _{2} O \rightarrow$ Insoluble
(3) $ZnCl _{2}+ nH _{2} O \rightarrow \underset{\text{Colourless}}{Zn _{\text {(aq.) }}^{+2}}$
(4) $Cu _{2} Cl _{2}+ nH _{2} O \rightarrow$ Insoluble