First slide

Qualitative analysis

Question

Salt is consisting of cations:

Moderate

A

${Pb}^{2 +} and {Hg}^{2 +}$
B

${Pb}^{2 +} and {Hg}_{2}^{2 +}$
C

${Pb}^{2 +} and {Ag}^{\oplus}$
D

${Pb}^{2 +}, {Hg}_{2}^{2 +} and {Ag}^{\oplus}$

Solution

The white ppt is due to the formation of chloride, like PbCl₂, In the last step the clear solution obtained on passing ammonia is due to the formation of Tollens reagent ${[A g {(N H_{3})}_{2}]}^{+}$

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