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Q.

Which is most thermodynamically stable allotropic form of phosphorus?

Q.

Cold solution of barium nitrite on mixing with sulphuric acid produces

Q.

 gas is passed into aqueous solution of KBr and KI and  added. It is observed that there is

Q.

Estimation of ozone can be made quantitatively by

Q. Explain thermal stability of hydries of 16 group?

The thermal stability of the hydrides of group 16 elements decreases down the group, i.e., H2O > H2S > H2Se > H2Te > H2Po. This is because M-H bond dissociation energy decreases down the group with the increase in the size of central atom.

Q. Why AgI is insoluble in NH3 while AgCl is soluble?

AgI when dissolve in NH3 forms a precipitate [Ag(NH3)]I which is insoluble , where as (Ag(NH3)}Cl forms a stable cordination compound , therefore it is soluble