Question

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.

1. Name (i) W (ii) X (iii) Y and (iv) Z.
2. Out of W, X, Y and Z, which substance/substances can undergo sublimation ?
3. Which substance is organic in nature ?
4. What is the name of substance C ?
5. Which substance belongs to the halogen family ?

Answer 1

(a) The names are :

1. Iodine
2. Sodium chloride, which is commonly known as common salt
3. Naphthalene
4. Ammonium chloride

(b) In this ‘W’-iodine, ‘Y’-naphthalene and ‘Z’- ammonium chloride that undergo sublimation.

(c) ‘Naphthalene’ is organic in nature.

(d) The name of the substance ‘C’ is tincture iodine.

(e) In this Iodine belongs to the halogen family.