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) ${H}_{2}{S}_{2}{O}_{3}$   (III)  ${H}_{2}{S}_{2}{O}_{5}$

(a) I II and III         (b) II I and III

(c) II III and I         (d) I III and II

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Difficulty Level:

The state of hybridisation of central atom in dimer of $B{H}_{3}$ and $Be{H}_{2}$ is:

(a) $s{p}^{2},s{p}^{2}$    (b) $s{p}^{3},s{p}^{2}$  (c) $s{p}^{3},s{p}^{3}$  (d) $s{p}^{2},s{p}^{3}$

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Difficulty Level:

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

(a) $OC{N}^{-}$

(b) ${H}_{2}O$

(c) ${C}_{2}{H}_{2}C{l}_{2}$

(d) ${O}_{3}$

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Difficulty Level:

${O}_{2}{F}_{2}$ is an unstable yellow orange solid and ${H}_{2}{O}_{2}$ is a colourless liquid both have O$—$O bond and

O$—$O bond length in  ${H}_{2}{O}_{2}$ and ${O}_{2}{F}_{2}$ respectively is:

(a) 1.22 A, 1.48               (b) 1.48 A, 1.22A

(c) 1.22 A, 1.22A             (d) 1.48 A, 1.48A

Concept Questions :-

Resonance
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Difficulty Level:

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

(a)

(b) $SOB{r}_{2}$

(c)$SO{F}_{2}$

(d) All have the same length

Concept Questions :-

Covalent Bonding
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Difficulty Level:

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

and

(A)                                  (B)

(a) Highr than that of A

(b) Lower than that of A

(c) same as that of A

(d) can be higher or lower depending upon the size of the vessel

Concept Questions :-

Hydrogen Bonding
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Difficulty Level:

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

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

(b) both energy decrease down the group but decrease in hyderation energy is rapid

(c) both energy decrease down the group but decrease in lattice energy is rapid

(d) both energy decrease down the group but increase in hyderation energy is rapid

Concept Questions :-

Lattice/Hydration Energy
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Difficulty Level:

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

(a) $B{{F}_{4}}^{-}$       (b) $B{F}_{3}←N{H}_{3}$

(c) $B{F}_{3}$         (d) $B{F}_{3}←N{\left(C{H}_{3}\right)}_{3}$

Concept Questions :-

Hybridisation
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Difficulty Level:

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

(a) $N{H}_{3}<{H}_{2}O    (b) ${H}_{2}S

(c) ${H}_{2}O    (d) $HF<{H}_{2}O

Concept Questions :-

Polarity
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Difficulty Level:

The correct order or boiling point is:

(a) ${\mathrm{T}}_{2}<{\mathrm{D}}_{2}<{\mathrm{H}}_{2}$

(b) n-pentane<neo pentane

(c) Xe<Ar<He

(d) m-nitrophenol>o-nitrophenol

Concept Questions :-

Types of Bonding