Question

4. A pinch of common salt is dissolved in 50mL of water taken in a graduated cylinder.Which of the following observation is correct?

a) level of water in the graduated cylinder decreases.

b) level of water in the graduated cylinder increases.

c) level of water in the graduated cylinder remains same.

d) all the observations are correct.

Answer 1

Answer:

answer is c

according to me

Answer 2

Answer:

The correct answer is (c) Level of water in the graduated cylinder remains the same.

Explanation:

When common salt is added to water, it dissolves in it, producing a cation and anion.

1. Cation- $Na^{+}$
2. Anion- $Cl^{-}$

• We do not see any rise in level because the cations and anions occupy the free spaces amongst the water molecules.
• It is also because the quantity of salt is not enough to cause a change in level.
• When a large amount of salt is added, the dissociation becomes quite difficult and they will be an increase in level.