`SIF_(4)` and `PF_(5)` act as Lewis`………..`

CN^(-) is a Lewis ………………..

PCl_5 behaves as a Lewis acid.

Which of the following compound possesses Lewis acid character? (1) BF_(3) (2) SiF_(4) (3) PF_(5) Select the correct answer using the codes given below

Statement-1 : AlF_(3) is a high melting point solid whereas SiF_(4) is a gas and Statement-2 : Both AlF_(3) and SiF_(4) are covalent molecules .

XeF_(2) reacts with PF_(5) to give :

Pair of molecules which forms strongest intermolecular hydrogen bonds is ……… (SiH_(4) and SiF_(4) , acetone and CHCl_(3) , formic acid and acetic acid)

(a) Write the reaction of the thermal decomposition of sodium azide. (b) Why does NH_3 act as a Lewis base ?

(a) Write the reaction of the thermal decomposition of sodium azide. (b) Why does NH_3 act as a Lewis base ?

Assertion : PF_(5),SF_(6)and H_(2)SO_(4) are the examples of expanded octet molecules . Reason : Octet rule is not applicable to the second period elements of the periodic table.

In the reaction of BeF_(2) with 2F^(Θ) to form BeF_(4)^(-2) , which reactant is the Lewis acid and which is the Lewis base?