The correct statements regarding the situation, when a Lyophilic sol is added to a Lyophobic sol, are-

a. Lyophobic sol is protected

b. Lyophilic sol is protected

c. Film of lyophilic sol is formed over lyophobic sol

d. Film of lyophobic sol is formed over lyophilic sol

1. (a, b)

2. (b, c)

3. (c, a)

4. (a, d)

Hint: Lyophobic sol is protected because film of lyophilic sol is formed over lyophobic sol.
Lyophobic sol is unstable in nature when lyophilic sol is added to lyophobic sol then lyophobic sol is protected because a film of lyophilic sol is formed over lyophobic sol.
Hence, (a) and (c) are correct.