Sublimation

There are four substances $W, X, Y$ and $Z$. The substance W is a dark violet solid having diatomic molecules. A solution of $W$ in alcohol is used as a common antiseptic $C$. The substance $X$ is a white solid which is usually recovered from sea water on a large scale. The substance $Y$ is a white solid which is insoluble in water and used in the form of small balls for the safe storage of woollen clothes. The substance $Z$ is a yet another white solid which is used in making commonly used dry cells.

What is the name of substance $C$ ?

There are four substances $W, X, Y$ and $Z$. The substance W is a dark violet solid having diatomic molecules. A solution of $W$ in alcohol is used as a common antiseptic $C$. The substance $X$ is a white solid which is usually recovered from sea water on a large scale. The substance $Y$ is a white solid which is insoluble in water and used in the form of small balls for the safe storage of woollen clothes. The substance $Z$ is a yet another white solid which is used in making commonly used dry cells.

Out of $W, X, Y$ and $Z$, which substance/substances can undergo sublimation ?

With the help of a well-labelled diagram (with two labelling) explain how solid ammonium chloride converts directly to gaseous state on heating?  

Describe the process of sublimation by taking the example of ammonium chloride.

Explain, why naphthalene balls kept in stored clothes in our homes disappear over a period of time?

Give one use of dry ice.

What is the common name of solid carbon dioxide?

Is dry ice the same thing as ordinary ice?

Name the process due to which dry ice changes into carbon dioxide gas.

What is the name of the process in which: a gas changes directly into a solid?

What is the name of the process in which: a solid change directly into a gas?

What is sublimation? Name two substances that undergo sublimation.

Name a suitable technique to separate sand from ammonium chloride.