Chemistry · 2020
JEE Main · 2 September 2020, Shift 1 · Q27
For the following Assertion and Reason, the correct option is Assertion (A): When Cu (II) and sulphide ions are mixed, they react together extremely…
For the following Assertion and Reason, the correct option isAssertion (A): When Cu (II) and sulphide ions are mixed, they react together extremely quickly to give a solid.Reason (R) : The equilibrium constant of $\displaystyle \mathrm{Cu}^{2+}(\mathrm{aq})+\mathrm{S}^{2-}(\mathrm{aq}) \rightleftharpoons \mathrm{CuS}(\mathrm{s})$ is high because the solubility product is low.
Official answer
(2)
Both (A) and (R) are true but (R) is not the explanation for (A).
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JEE Main 2020 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.