A first order reaction has a specific reaction rate of 10^$$-$$2 sec^$$-$$1. How much time will it take for 20 g of the reactant to reduce to 5 g?

It is because of inability of ns² electrons of the valence shell to participate in bonding that

Match the interhalogen compounds of column-I with the geometry in column-II and assign the correct code.

Column $${\rm I}$$			Column $${\rm I}$$$${\rm I}$$
(A)	XX'		(i)	T-shape
(B)	XX'3		(ii)	Pentagonal bipyramidal
(C)	XX'5		(iii)	Linear
(D)	XX'7		(iv)	Square pyramidal
			(v)	Tetrahedral

The correct increasing order of basic strength for the following compounds is