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Reshma and her mother went to a shop to buy a shawl to keep them warm during winter. The shopkeeper gave her an expensive one that looked very attractive and told her that it was pure wool. After coming home, Reshma took a small thread from it and tested it by burning. Immediately she realized that they were cheated and the shawl was not of pure wool. Which of the following would have helped her to come to the correct conclusion? The thread ………………………………. (i) formed a crushable bead. (ii) gave out the smell of burning paper. (iii)started melting (iv) formed a hard bead. (a) (i) and (ii) (b) (i) and (iii) (c) (iii) and (iv) (d) (ii) and (iv)​

Answer»

Answer: (iii) It STARTED melting

Explanation:  When you burn Wool, and other Protein Fibers: Burns with an orange sputtery color, but does not melt. It shrinks from the flame. It has a strong odor of burning hair or feathers. The residue is a black, HOLLOW irregular BEAD that can be easily crushed into a GRITTY black powder.



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