carbon and its compounds

Which consists of carbon atoms?

• graphite
• diamond
• fullerene
• all of these

Which has every carbon atom covalently bonded to four other atoms?

• graphite
• diamond
• fullerene
• none of these

Which is used as a cutting tool and in jewelry?

• graphite
• diamond
• fullerene
• none of these

Define the term allotropes

• Atoms with same proton number but different number of neutrons
• Atoms with same proton number but different mass number
• Atoms in different arrangement in structure
• Atoms in different arrangement and different physical form

Carbon is arranged in what shape to make diamond?

• Triangle

• Hexagon

• Octahedron

• Tetrahedron

Cation is formed when

• Atom gains electrons

• Atom loses electrons

• Proton is lost by the atom

• Atom shares electrons

The property of self-linkage among identical atoms to form long chain compounds is known

• Superposition

• Catenation

• Isomerisation

• Halogenation

Which of the following statements about graphite and diamond is true?

• They have the same crystal structure

• They have the same degree of hardness

• They have the same electrical conductivity

• They can undergo the same chemical reactions

From which of the following substance pencil lead is formed?

• Charcoal

• Wood

• Lead

• Graphite

Covalent bonds

• has low melting and boiling point

• are generally poor conductors of electricity

• has weak inter-molecular forces

• All of the above