Give reasons for the following
a. A silver object gradually turns black when left in open.
b.Gold ornaments retain their lustre even after several years.

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Solution

a.The silver article becomes black sometimes when exposed to air because the sulphur which is present in the atmosphere reacts with silver and forms hydrogen sulphide.
b.Gold is unreactive in nature and that is why it never loses its lustres.

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Similar questions

Q. Why do gold ornaments look new even after several years of use?

Give scientific reasons.

(a) Gold and silver are used is coins.

(b) Ornaments are generally not made from 24-carat gold.

(d) Gold and platinum are called noble elements.

(e) Stainless steel has more lustre than iron.

Metals X and Y can be recovered from the anode mud left behind after the electrolytic refining of copper metal. The coins made of metal X look new even after several years of use but the coins made of metal Y lose their shine gradually and get blackened soon. When metal X is alloyed with a small amount of metal Y, It becomes hard and hence suitable for making ornaments. What are metals X and Y? Also, state the colour of metal X.

Q. Why do ornaments of gold and silver look dull after using for some time?

State reasons for the following:

Some Silver is added to pure gold for making ornaments.

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Give reasons for the followinga. A silver object gradually turns black when left in open.b.Gold ornaments retain their lustre even after several years.

a.The silver article becomes black sometimes when exposed to air because the sulphur which is present in the atmosphere reacts with silver and forms hydrogen sulphide.b.Gold is unreactive in nature and that is why it never loses its lustres.

Give reasons for the following
a. A silver object gradually turns black when left in open.
b.Gold ornaments retain their lustre even after several years.

a.The silver article becomes black sometimes when exposed to air because the sulphur which is present in the atmosphere reacts with silver and forms hydrogen sulphide.
b.Gold is unreactive in nature and that is why it never loses its lustres.