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Hansa, a class XII student, was discussing diazonium salts. She emphasized that although azo dyes are excellent for dyeing fabric but the food coloured with azo dyes is harmful particularly for young children and asthma patients. Therefore, she stressed that only natural dyes should be used for colouring food. After reading the above passage, answer the following questions :

(i) What are azo dyes? Give one example.

(ii) Name an azo dye which has been used as a food colour in the past but has now been banned?

(iii) Name a few natural food dyes. (iv) What values are expressed by Hansa.