All form ideal solution except:
[1 Mark]

H_{2} O

and

H C l

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C_{2} H_{5} B r

and

C_{2} H_{5} I

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C_{6} H_{5} C l

and

C_{6} H_{5} B r

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n - C_{6} H_{14}

and

n - C_{7} H_{16}

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Solution

The correct option is A $H_{2} O$ and $H C l$
Raoult's law is valid for ideal solutions only. The element of non- ideality enters into the picture when the molecules of the solute and solvent affect each others intermolecular forces. A solution containing components of A and B behaves as ideal solution when A-B attraction force remains same as A - A and B - B attraction forces.
Here except option (A), in all the cases intermolecular and intermolecular bonding remains same.
But in option (A), there will be extensive intermolecular hydrogen bonding. Thus it will not form an ideal solution.

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