Question

25 cm of liquid 'A' and 20 cm of liquid

'B' are mixed at 25°C and the volume of
solution was measured to be 44.8 cm3
then correct reaction is
(A) A Hmix = 0, solution shows
ideal

Answer 1

The correct option is;

(B)
`\Delta H_(mix) < 0`, solution shows negative deviation

Step-by-step explanation:

The given parameters are;

The available volume of liquid A = 25 cm³

The available volume of liquid B = 20 cm³

The volume of the solution (mixture) = 44.8 cm³

Therefore, we have;

`\Delta _(mix) V < 0`

Which is one of the prerequisite for the formation of negative deviation

When a non-ideal solution shows negative deviation according to Raoult's Law, we have;

`\Delta _(mix) H < 0`, we have more heat released due to new molecular interactions.