Adding soap to water ................

$A$ cube of edge length $1 \ cm$ is divided into smaller cubes of uniform size of length $1 \ nm$. Assuming that no voids are present, the ratio of total surface area of all the cubes of $1 \ nm$ edge length to the surface area of the initial cube is

Photographic films and plates have an essential ingredient of

Which of the following are not completely surface phenomena?

Which of the following statements are not true?

Identify the correct statement$(s)$ from the following:
$a$) Protective power of a lyophilic sol is more if its gold number is more
$b$) In the coagulation of negative sols,the coagulating power of cations follow the order $Na^{+} > Ba^{2+} > Al^{3+}$
$c$) Cloud is a solid in gas type of colloid
$d$) Physical adsorption is non-specific and multilayered at high pressure.