Which of the following statement is wrong?

(1) The stability of hydrides increase from NH₃ to BiH₃ is group 15 of the periodic table.

(2) Nitrogen cannot form $d\mathrm{\pi }-\mathrm{p\pi }$ bond.

(3) Single N-N bond is weaker than the single P-P bond.

(4) $N_2{O}_4$ has four resonance structure

The structure of ${\mathrm{IF}}_7$ is

(1) square pyramid

(2) trigonal bipyramid

(3) octahedral

(4) pentagonal bipyramid

In which of the following pairs the two species are not isostructural?

(1) $PC{l}_4^{+} and SiC{l}_4$

(2) $P{F}_5 and Br{F}_5$

(3) $Al{F}_6^{3-}$ and $S{F}_6$

(4) $C{O}_3^{2-} and N{O}_3^{-}$

In allene $\left(C_3{H}_4\right),$ the type(s) of hybridization of the carbon atoms is (are):

1. sp and sp³

2.  sp and sp²

3. only sp²

4.  sp² and sp³

The shape of $Xe{O}_2{F}_2$ molecule is:

(1) trigonal bipyramidal

(2) square planar

(3) tetrahedral 

(4) see-saw

How many number of water molecule (s) directly bonded to the metal centre in $CuS{O}_4 . 5H_{2}O$is

(1) 3

(2) 2

(3) 4

(4) 5

A molecule having the smallest bond angle among the following is :

The pair of species having identical shapes for molecules of both species is

1. CF${}_4$ SF${}_4$

2. XeF${}_2$ CO${}_2$

3. BF${}_3$ PCI${}_3$

4. PF${}_5$IF${}_5$

The correct order of bond angles (smallest first) in H₂S, NH₃, BF₃ and SiH₄ is 

1. H₂S < SiH₄ < NH₃  < BF₃

2. NH₃ < H₂S < SiH₄ < BF₃

3. H₂S < NH₃ < SiH₄ < BF₃

4. H₂S < NH₃ < BF₃ < SiH₄

The bond order in NO is 2.5 while that in NO${}^{+}$ is 3.

Which of the following statements is true for these

two species? 

1. bond length in NO${}^{+}$ is greater than in NO

2. bond length in NO is greater than in NO${}^{+}$

3. bond length in NO${}^{+}$ is equal than in NO

4. bond length is unpredictable