MCQ
Which of the following is most electronegative
- ✓$O$
- B$S$
- C$Te$
- D$Se$
| Element - | $O$ | $S$ | $Sc$ | $Te$ | $Po$ |
| Electo negativity - | $3.5$ | $2.5$ | $2.4$ | $2.1$ | $2.0$ |
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Statement $I:$ Primary aliphatic amines react with $HNO _{2}$ to give unstable diazonium salts.
Statement $II:$ Primary aromatic amines react with $HNO _{2}$ to form diazonium salts which are stable even above $300 \,K$.
In the light of the above statements, choose the most appropriate answer from the options given below:
$1$ litre of mixture $X +$ excess of $AgNO_3 \to Y$
$1$ litre of mixture $X +$ excess of $Ba Cl_2 \to Z$
Number of moles of $Y$ and $Z$ respectively are