MCQ
$C{u^{2 + }}(aq.) + {X^ - }(aq.)\xrightarrow{{R.T.}}CuX \downarrow + {X_2}$
$'X'$ cannot be
- ✓$Cl^- (aq.)$
- B$I^- (aq.)$
- C$CN^- (aq.)$
- D$SCN^- (aq.)$
$'X'$ cannot be
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Assertion $(A)$ : $\mathrm{NH}_3$ and $\mathrm{NF}_3$ molecule have pyramidal shape with a lone pair of electrons on nitrogen atom. The resultant dipole moment of $\mathrm{NH}_3$ is greater than that of $\mathrm{NF}_3$.
Reason $(R)$ : In $\mathrm{NH}_3$, the orbital dipole due to lone pair is in the same direction as the resultant dipole moment of the $\mathrm{N}-\mathrm{H}$ bonds. $\mathrm{F}$ is the most electronegative element.
In the light of the above statements, choose the correct answer from the options given below: