Idetify the correct sequence of increasing number of π bonds in the structure of the following molecules :

(I) H2S2O6     (II) H2S2O3   (III)  H2S2O5

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

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

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The state of hybridisation of central atom in dimer of BH3 and BeH2 is:

(a) sp2,sp2    (b) sp3,sp2  (c) sp3,sp3  (d) sp2,sp3

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

(a) OCN- 

(b) H2O

(c) C2H2Cl2

(d) O3

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O2F2 is an unstable yellow orange solid and H2O2 is a colourless liquid both have OO bond and 

OO bond length in  H2O2 and O2F2 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 :-

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The bond length of the SO bond in maximum in which of the following compounds?

(a)  SOCI2 

(b) SOBr2 

(c)SOF2 

(d) All have the same length

Concept Questions :-

Covalent Bonding
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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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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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In which of the following compounds BF bond length is shortest ?

(a) BF4-       (b) BF3NH3

(c) BF3         (d) BF3NCH33

Concept Questions :-

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

(a) NH3<H2O<HF<H2S    (b) H2S<NH3<H2O<HF

(c) H2O<NH3<H2S<HF    (d) HF<H2O<NH3<H2S

Concept Questions :-

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The correct order or boiling point is:

(a) T2<D2<H2                                 

(b) n-pentane<neo pentane

(c) Xe<Ar<He

(d) m-nitrophenol>o-nitrophenol

Concept Questions :-

Types of Bonding
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