Among the following species, identify the isostructural pairs :

NF₃, , BF₃, H₃O⁺, HN₃, ${\mathrm{NO}}_3^{-}$

1. [NF₃,${\mathrm{NO}}_3^{-}$ ] and [BF₃, H₃O⁺]                  

2. [NF₃, HN₃] and [${\mathrm{NO}}_3^{-}$, BF₃]   

3. [NF₃, H₃O⁺] and [${\mathrm{NO}}_3^{-}$, BF₃]         

4. [NF₃, H₃O⁺] and [HN₃, BF₃]

 

The linear structure is not assumed by

1. ${\mathrm{SnCl}}_2$

2. ${\mathrm{NCO}}^{-}$

3. ${\mathrm{NO}}^{+}$

4. ${\mathrm{NO}}_2^{+}$

${\mathrm{CO}}_3^{2-}$anion does not has which of the following characteristics

1. Bonds of unequal length                               

2. sp² hybridization  of c atom

3. Resonance stabilization                                   

4. Same bond angles

Which of the following process is not associated with change of hybridization of the underlined compound

1. $\underline{\mathrm{Al}}{\left(\mathrm{OH}\right)}_3$ ppt. dissolved in NaOH

2. ${\underline{\mathrm{B}}}_2{\mathrm{H}}_6$ is dissolved in THF

3. $\underline{\mathrm{Si}}{\mathrm{F}}_4$ vapour is passed through liq. HF

4. Solidification of $\underline{\mathrm{P}}{\mathrm{Cl}}_5$ vapour

Incorrect statement among the given options is: 

Favourable conditions for electrovalency are:

The correct order of the O–O bond length in ${\mathrm{O}}_2,{\mathrm{H}}_2{\mathrm{O}}_2 \mathrm{and} {\mathrm{O}}_3$ is :-

1. ${\mathrm{O}}_2>{\mathrm{O}}_3>{\mathrm{H}}_2{\mathrm{O}}_2$

2. ${\mathrm{O}}_3>{\mathrm{H}}_2{\mathrm{O}}_2>{\mathrm{O}}_2$

3. ${\mathrm{H}}_2{\mathrm{O}}_2>{\mathrm{O}}_3>{\mathrm{O}}_2$

4. ${\mathrm{H}}_2{\mathrm{O}}_2>{\mathrm{O}}_2>{\mathrm{O}}_3$

CaO and NaCl have the same crystal structure and approximately the same ionic radii. If U is the lattice energy of NaCl, the approximate lattice energy of CaO is :-

1. U/2 

2. U 

3. 2 U 

4. 4 U

Which of the following sequences represents the increasing order of the polarizing power of the cationic species?

K⁺, Ca⁺², Mg⁺², Be⁺²

1. Be⁺² < K⁺ < Ca⁺² < Mg⁺² 

2. K⁺ < Ca⁺² < Mg⁺² < Be⁺²

3. Ca⁺² < Mg⁺² < Be⁺² < K⁺ 

4. Mg⁺² < Be⁺² < K⁺ < Ca⁺²

Which of the following is the correct order of dipole moment?

1. $N{H}_3<B{F}_3<N{F}_3<H_{2}O$

2. $B{F}_3<N{F}_3<N{H}_3<H_{2}O$

3. $B{F}_3<N{H}_3<N{F}_3<H_{2}O$

4. $H_{2}O<N{F}_3<N{H}_3<B{F}_3$