Matter in Our Surroundings

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1. 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.