P Block Elements

Reaction of ammonia with excess Cl₂ gives:

Boron and silicon of very high purity can be obtained through:

The number of bonds between sulphur and oxygen atoms in ${\mathrm{S}}_2{\mathrm{O}}_8^{-}$ ${}_{}{}_{}^{}$ and the number of bonds between sulphur and sulphur atoms in rhombic sulphur, respectively, are :

In the following reactions, products(A) and $\left(B\right)$ respectively are $\underset{\text{(Hot and Conc)}}{\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}}+{\mathrm{C}\mathrm{l}}_2?\left(\mathrm{A}\right)+$ side products $\mathrm{C}\mathrm{a}(\mathrm{O}\mathrm{H}{)}_2{\mathrm{C}\mathrm{l}}_2?(\mathrm{B})+$ side products (Dry)
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The oxidation states of 'P' in H?P?O?, H?P?O? and H?P?O?, respectively are:
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Hydrogen peroxide reacts with iodine in basic medium to give:

The reaction of sulphur in alkaline medium is given below

$S_{8\left(s\right)}+aO{H^{-}}_{\left(aq\right)}\to b{S^{2-}}_{\left(aq\right)}+c{S}_2{O_3^{2-}}_{\left(aq\right)}+d{H}_2{O}_{\left(I\right)}$           <!-- [if gte mso 9]><xml> </xml><![endif]--> 

The values of ‘a’ is____________. (Integer answer)

In mildly alkaline medium, thiosulphate ion is oxidized by <!-- [if gte mso 9]><xml> </xml><![endif]-->  $Mn{O}_4^{-}$ to “A”. The oxidation state of sulphur in ‘A’ is………….

The average S – F bond energy in kJ mol^-1 of SF₆ is………… (Rounded off to the nearest integer) [Given : The values of standard enthalpy of formation of SF₆(g), S(g) and F(g) are – 1100, 275 and 80 kJ mol^-1 respectively.]

Number of amphoteric compounds among the following is___________.