According to VSEPR theory in, which species do all the atoms lie in the same plane?

1. $C{H_3}^{+}$                                   2. $C{H_3}^{-}$

(1) 1 only                               

(2) 2 only 

(3) both 1 and 2                     

(4) neither 1 nor 2

Idetify the correct sequence of increasing number of $\mathrm{\pi }$ bonds in the structure of the following molecules :

(I) $H_2{S}_2{O}_6$     (II) $H_2{S}_{}{O}_3$   (III)  $H_2{S}_2{O}_5$

1. I II and III         2. II I and III

3. II III and I         4. I III and II

The state of hybridisation of central atom in dimer of $B{H}_3$ and $Be{H}_2$ is:

(1) $s{p}^2,s{p}^2$   

(2) $s{p}^3,s{p}^2$ 

(3) $s{p}^3,s{p}^3$ 

(4) $s{p}^2,s{p}^3$

Which of the following species/molecules does not have same number of bond pairs and lone pairs?

(1) $OC{N}^{-}$ 

(2) $H_{2}O$

(3) $C_2{H}_{2}C{l}_2$

(4) $O_3$

O$—$O bond length ($\mathrm{in}<mspace\; width="1em"></mspace>\stackrel{°}{\mathrm{A}}$ ) in  $H_2{O}_2$ and $O_2{F}_2$ is respectively:

The bond length of the S$—$O bond in maximum in which of the following compounds?

1. $<mspace\; width="1em"></mspace>SOC{I}_2$ 

2. $SOB{r}_2$ 

3.$SO{F}_2$ 

4. All have the same length

Out of the two compounds shown below, the vapour pressure of B at a particular temperature is expected to be :

(A)  and (B) 

(1) Higher than that of A

(2) Lower than that of A

(3) Same as that of A

(4) Can be higher or lower depending upon the size of the vessel

Solubillity of alkali metal fluorides increases down the group select correct explanation for given statement :

(1) Hydration energy increase and lattice energy decrease down the group 

(2) Both energy decrease down the group but decrease in hydration energy is rapid

(3) Both energy decrease down the group but decrease in lattice energy is more

(4) both energy decrease down the group but increase in hydration energy is rapid

In which of the following compounds B$—$F bond length is shortest ?

(a) $B{F_4}^{-}$       (b) $B{F}_3\leftarrow N{H}_3$

(c) $B{F}_3$         (d) $B{F}_3\leftarrow N{\left(C{H}_3\right)}_3$

In terms of polar character which of the following order is correct?

1. $N{H}_3<H_{2}O<HF<H_{2}S$   

2. $H_{2}S<N{H}_3<H_{2}O<HF$

3. $H_{2}O<N{H}_3<H_{2}S<HF$   

4. $HF<H_{2}O<N{H}_3<H_{2}S$