Question

Shashi bought new silver anklets. After a month she found that the anklets turn black. She hasdoubt that it is not of pure silver but her neighbor Rakhi advised her that it is of pure silver andwash it with tamarind or lemon juice to get the luster back. She followed the advice and get theluster of her anklet back.Read the above passage and answer the following questions:(a) Do you think that the anklets are not of pure silver?(b) Why these turn black after sometime?(c) Why the anklets become lustrous on washing with tamarind or lemon juice?
(d) What values are exhibited by Rakhi?

Answer 1

a)no the bangles were made of pure silver.
b)these turn black because silver reacts with the sulphur present in the air to form a black coating to form silver sulphide.
c)because tamarind juice and lemon juice are acidic in nature and they are capable of removing the layer.
d)intelligence and concern towards her friend's problem.

Answer 2

a). The anklet is of pure silver, it just reacted with water and free air to get converted into greyish silver oxide which turned it black.
b). After washing with tamarind or lemon juice the acidic content in them removed the basic silver oxides. Hence, the lustre came back.
c) They neutralize the silver.
d) Rakhi is a helpful person and is ready to assist people in need, she has good knowledge on chemistry topics.