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 whit 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.

(a) Name (i) W (ii) X (iii) Y and (iv) Z.
(b) Out of W,X,Y and Z, which substance/substances can undergo sublimation?
(c) Which substance is organic in nature ?
(d) What is the name of substance C ?
(e) Which substance belongs to the halogen family ?

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Solution

(a) The names are :
(i) Iodine
(ii) Sodium chloride, which is commonly known as common salt
(iii) Naphthalene
(iv) 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.

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