Chemistry

Sulphide ion (s^2-) form ores commonly with Pb & Ag as PbS and Ag₂S

3-Ethylhex-3-ene will not show stereo isomerism

Methylhex-1-ene will show steroisomerism (optical isomerism)

Since it has chiral carbon.

3, 4-Dimethylhex-3-ene will show stereoisomerism (Geometrical isomerism)

4-Methylhex-1-ene will show stereoisomerism (optical) since it has one chiral carbon

$2NaB{H}_4+l_2\to 2Nal+H_2+B_2{H}_6$

Diborane is produced when NaBH₄ is reacted with I₂

Both boron atoms are sp³ hybridised & molecule is non-planar. Diborane as two bridged 3 centre-2-electron bonds.

Compound A is phenol since phenol gives dark green colour with FeCl₃.

(A) $N{i}^{2+}-4s^{0}3d^8$ - Paramagnetic & coloured

$M{n}^{7+}-4s^{0}3d^0$       - Diamagnetic & colourless

$H{g}^{2+}-6s^{0}4f^{14}5d^{10}$ - Diamagnetic & colourless

(B)  $C{u}^{+}-4s^{0}3d^{10}$    - Diamagnetic & colourless

$Z{n}^{2+}-4s^{0}4d^{10}$          - Diamagnetic & colourless

$M{n}^{4+}-4s^{0}3d^3$    - paramagnetic & coloured

(C)  $S{c}^{3+}-4s^{0}3d^0$

$\begin{array}{l}{V}^{5+}-4s^{0}3d^0\\ T{i}^{4+}-4s^{0}3d^0\end{array}$  

All are diamagnetic & colourless

(D)  $C{u}^{2+}-4s^{0}3d^9$  

$\begin{array}{l}C{r}^{3+}-4s^{0}3d^3\\ S{c}^{+}-4s^{1}3d^1\end{array}$

All are paramagnetic & coloured

All d- & f block paramagnetic cations are coloured also.

  $C{H}_3-C{H}_2-C{H}_2-C-N{H}_2\to \pi -\mathcal{l}pconjugation$  

              $C{H}_3-C{H}_2-CH=CH-C{H}_2-N{H}_2\to$ No conjugation

          $C{H}_3-C{H}_2-O-CH=C{H}_2\to \pi -\mathcal{l}p$     conjugation

Depression in freezing point will be maximum for Al₂ (SO₄)₃ since its Van't Hoff factor is the highest. So its solution will have the lowest freezing point.

Only tritium is the isotope of hydrogen which is radioactive in nature that emits low energy b^- particles since its $\frac{n}{p}$ ratio is above stability belt.