Question

1. More reactive metals occur in the combined form where is less reactive metals occur as free metal in the nature give reasons

2. mention one use of each of the following

Copper,aluminium, phosphorus and hydrogen

Answer 1

1)
More reactive metals such as aluminium, magnesium etc. have a tendency to react or combine with other elements to form compounds and thus they occur in combined form but less reactive metals such as gold, platinum etc. donot have a tendency to combine with other elements and thus they exist as free metal.

2)
COPPER- it is used for making electrical wires and cables,coils,pipe fittings, parts of electrical equipment, to make cooking utensils, in integrated circuits, and electromagnets.

ALUMINIUM- it is used for making cooking utensils, packaging tins, cans, packing foils, parts of machinery , automobiles and building materials

PHOSPHORUS-it is used for making matchsticks and fireworks. Compounds of phosphorus called phosphates are an important agricultural fertilizer.

HYDROGEN- it is primarily used for the synthesis of ammonia and methyl alcohol. it is used in welding torches and in the extraction of metals. Hydrogen is also used as a non polluting fuel