Question

Assertion :$\left[Cu\right(N{H}_3{)}_4{]}^{2+}$ is coloured while $\left[Cu\right(CN{)}_4{]}^{3-}$ is colourless. Reason: $\left[Cu\right(N{H}_3{)}_4{]}^{2+}$ has $ds{p}^2$ hybridisation.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

${\left[Cu{\left({NH}_3\right)}_4\right]}^{2+}$ is coloured ${\left[{Cu\left(CN\right)}_4\right]}^{3-}$ is colourless also ${\left[{Cu\left({NH}_3\right)}_4\right]}^{2+}$ has ${dsp}^2$ hybridisation but it isn't the reason behind the assertion.