Xjee14-07-25

The name of the carbon is derived from Latin word is

• Coal

• Carbo

• Cabro

• Carro

The third most important element for existence of life on the earth is

• Hydrogen

• Oxygen

• Carbon

• Nitrogen

The forces of interaction holding graphite sheets are

• Ionic forces

• Covalent forces

• Vanderwaals forces

• Metallic forces

The most common isotope of carbon is

• C12

• C13

• C14

• C11

Choose the correct statements related to graphite

• It is the hard substance

• It is used in making jewelery

• Smooth black solid, which can conduct heat and electricity

• Carbons in graphite show sp3 hybridization

What are the two important carbon compounds from which we get the vast amount of energy needed to run factories?

• Wood and charcoal

• Coal and petroleum

• Carbohydrates and proteins

• Hydrogen gas and Natural gas

What is the hybridization of carbon in diamond?

• sp

• sp2

• sp3

• sp3 d

Moderate electrical conductivity is shown by

• Carborundum

• Diamond

• Graphite

• Silicon

Which of the following is not the property of diamond?

• Bad conductor of heat and electricity

• Good conductor of heat and electricity

• Hardest known substance

• Transparent and extraordinary brilliance

The refractive index of diamond is

• 5.52

• 2.5

• 4.52

• 1.52