Question

a.Name a lustrous non-metal.
b.Name a non-metal which exists as a liquid at room temperature.
c.The allotropic form of a non-metal is a good conductor of electricity. Name the allotrope.
d.Name a non-metal which is known to form the largest number of compounds.
e.Name a non-metal other than carbon that shows allotropy.
f.Name a non-metal which is required for combustion.

Answer 1

Hint: First we know that lustrous materials are those that have a shine on them. Examples are gold, silver, etc. The term allotrope refers to one or more physical forms of a chemical element that occurs in the same physical state. In a combustion reaction, a substance reacts with oxygen from the air. Allotropy is the property of some chemical elements to exist in two or more different forms, in the same physical state, known as allotropes of these elements.

Complete answer:
(a)
Iodine is a lustrous non-metal.
(b)
Bromine is a non-metal which exists as a liquid at room temperature.
(c)
Graphite is the allotropic form of carbon, and it is a good conductor of electricity.
(d)
Carbon is a non-metal which is known to form the largest number of compounds. Because of the Catenation property of the carbon element due to which its atoms can join one another to form long carbon chains.
(e)
Phosphorus is a non-metal other than carbon which shows allotropy.
(f)
Oxygen is a non-metal which is required for combustion.

Note:
Allotropes may show differences in chemical and physical properties. Non-lustrous materials are dull in appearance. Examples are Wood, Plastic, etc. Mercury is a metal that is a liquid at room temperature. Diamond (the hardest natural substance made of carbon) is another nonmetal which is lustrous in nature. Combustion reactions happen at high temperatures, and transfer energy to the surroundings as light and heat. This is why you see flames when things burn.