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Standard XII

Chemistry

Mathematics of Dipole Moment

In given mole...

Question

In given molecules, strongest van der waal bond exists in: hcl N2 H2 O2

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I C l, B r_{2}, H C l, H_{2} S, C O

In which of these molecule is the van der Waals' force likely to be the most important in determining the melting point and boiling point?

Q. The Van der Waals constant

^{'} b^{'}

for

N_{2}

and

H_{2}

has the values

0.04 l i t m o l^{- 1}

and

0.025 l i t m o l^{- 1}

. The density of solid

N_{2}

1 g . c m^{- 3}

. Assuming the molecules in the solids to be close packed with the same percentage void, the density of solid

H_{2}

would be: (in

g . c m^{- 3}

)

Q. For real gases van der Waals' equation is written as

(p + \frac{a n^{2}}{V^{2}}) (V - n b) = n R T

where a and b are van der Waals' constants. Two sets of gases are
(I)

O_{2}, C O_{2}, H_{2} and H e

(II)

C H_{4}, O_{2} and H_{2}

The gases given in set-I in increasing order of b and gases given in set - II in decreasing order of a, are arranged below. Select the correct order from the following:

For real gases the relation between, P, V and T is given by van der Waals' equation

$(P + \frac{a n^{2}}{V^{2}}) (V - n b) = n R T$

where 'a' and 'b' are van der Waals' constants, 'nb' is approximately equal to the total volume of the molecules of a gas. 'a' is the measure of the magnitude of intermolecular attraction.

(i) Arrange the following gases in the increasing order of 'b' Give reason.

$O_{2}, C O_{2}, H_{2}, H e$

(ii) Arrange the following gases in the descending order of magnitude of 'a'. Give reason.

$C H_{4}, O_{2}, H_{2}$

Q. Given van der Waals constant for

N H_{3}, H_{2}, O_{2}

and

C O_{2}

are respectively

4.17, 0.244, 1.36

and

3.59

, which one of the following gases is most easily liquefied?

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