a non metal combines with oxygen to form 2 gases A & B gas A is poisonous and combustible while gas B is non poisonous and extinguishes fire. the non metal also exists in 2 allotropic formsC & D. the form C is a good conductor of electricity where as form d is a bad conductor. name the non metal and A,B,C&D ?

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Solution

The non metal is carbon.
2C + O₂ → 2CO
A
C + O₂ → CO₂
B
A is carbon monoxide, B is carbon dioxide.
CO + O₂ → CO₂
A

Carbon exists in two allotropic forms, graphite and diamond. Graphite is a good conductor of electricity where as diamond is a bad conductor.
C is graphite and D is diamond.

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Q. Question 30
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous; non-sonorous; non-malleable and are coloured.
(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 which shows allotropy.
(f) Name a non-metal which is required for combustion.

Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.

The allotropic form of a non-metal, which is a good conductor of electricity is:

Q. A non-metal

X

exists in two different forms

Y

and

Z

Y

is the hardest natural substance whereas

Z

is a good conductor of electricity.

Y

is :

Fill in the following balnks with suitable words:

(a) Metals are ........................... conductors of heat and ............................

(b) Most non-metals are ........................... conductors of heat and ...........................

(d) Metals react with acids to produce ........................... gas.

(e) Iron is more ........................... than copper.

(f) Metals form ........................... oxides whereas non-metals form ........................... oxides.

(g) Sulphur forms ........................... oxide whereas magnesium forms ........................... oxide.

(h) A non-metal is used to make an antiseptic solution called tincture ...........................

A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y and Z. [3 MARKS]

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