Consider the sulphides $\mathrm{HgS}, \mathrm{PbS}, \mathrm{CuS}, \mathrm{Sb}_{2} \mathrm{~S}_{3}, \mathrm{As}_{2} \mathrm{~S}_{3}$ and CdS . Number of these sulphides soluble in $50 \% \mathrm{HNO}_{3}$ is \_\_\_\_ .

JEE Main · 2021 · 31 Aug 2021 · Shift 1 · Practical and Analytical Chemistry

Consider the sulphides

HgS, PbS, CuS, Sb_{2} S_{3}, As_{2} S_{3}

and CdS . Number of these sulphides soluble in

50% HNO_{3}

is ____ .

Answer: 5

Solution

Sulphides soluble in 50% HNO₃ are those that can be oxidized by dilute nitric acid. Among the given sulphides, HgS, PbS, CuS, and CdS are soluble in 50% HNO₃, while Sb₂S₃ and As₂S₃ require stronger oxidizing conditions (concentrated HNO₃ or aqua regia). Therefore, 4 sulphides are soluble in 50% HNO₃.

JEE Main · 2021 · 31 Aug 2021 · Shift 1 · Integer answer

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