Chemistry

Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).

A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular ...

Differentiate between metal and non-metal on the basis of their chemical properties.

You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels.

Give reasons (a) Platinum, gold and silver are used to make jewellery. (b) Sodium, potassium and lithium are stored under oil. (c) Aluminium is a highly reactive metal, yet it is used to make utensils for cooking. (d) Carbonate and sulphide ores are usually ...

What type of oxides are formed when non-metals combine with oxygen?

State two ways to prevent the rusting of iron.

Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it, as shown in figure below. (a) What will be the action of gas on (i) dry litmus paper? (ii) moist litmus ...

In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte?