Assertion (A) In osmosis, solvent molecules pass through a semi-permeable membrane from a more dilute solution to a more concentrated one, when these two are separated by the semi-permeable membrane.

Reason (R) The vapour pressure of the solvent over the dilute solution is less than that over the concentrated solution.

Assertion (A) Surface tension is zero at critical temperature.

Reason (R) At critical temperature surface disappears.

Consider the following statements

1. During the process of osmosis, the solvent travels from the concentrated solution to the dilute solution.

2. In the reverse osmosis, external pressure is applied to the dilute solution.

Which of the statement(s) given above is/are correct?

Which of the following is/are the example/examples of a chemical change?

1. The crystallisation of sodium chloride
2. Melting of ice
3. Souring of milk

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Which of the following statements in connection with the properties of water is /are correct?

$1$. Water has higher specific heat in comparison with other liquid.

$2$. Water has no dipole moment.

$3$. Water has low heat of vaporisation.

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Which of the following represent a chemical change?

1. Magnetisation of iron.

2. Condensation of liquid.

3. Burning of fuel.

4. Rusting of iron.

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