CARBON AND ITS COMPOUNDS

The use of diamond in abrasives is due to its

• high melting point

• hardness

• octahedral shape

• durability

Graphite and diamond are similar in that they

• have octahedral shape

• have same density

• form carbon(IV) oxide o combustion

• conduct electricity

Which of the allotropes of carbon is a constituent of a lead pencil?

• Graphite

• Diamond

• Lampblack

• Soot

The 'gasification of coke' is used for the manufacture of

• producer gas

• natural gas

• synthetic gas

• industrial gas

Which of the following compounds is a neutral oxide?

• Carbon(IV) oxide

• Carbon(II) oxide

• Sulphur (IV) oxide

• Sulphur (VI) oxide

A form of carbon used for absorbing poisonous gases and purification of noble gases is

• wood charcoal

• animal charcoal

• carbon fibres

• carbon black

Synthetic gas is a mixture of

• CH₄ and H₂O

• CH₄ and H₂

• CO and H₂

• CO₂ and H₂

The allotropes of carbon used in the decolourisation of sugar of

• graphite

• soot

• charcoal

• lamp black

When steam is passed over red - hot carbon, the substances produced are

• hydrogen and trioxocarbonate(IV) acid

• hydrogen, oxygen and carbon(II)oxide

• hydrogen and carbon(II) oxide

• hydrogen and carbon(IV) acid

Carbon is tetravalent because

• electrons in both the 2s and 2p orbitals are equivalent

• the electrons in all the orbitals of carbon are equivalent

• the 2s and 2p orbitals hybridised

• all the atomic orbitals of carbon hybridise