Life and How It's Formed

Q. Which of the following fuels contain carbon in them?

1. Coal
2. Petroleum
3. Biogas
4. Natural gas

Q.

Find out the valency of oxygen and aluminium.

Q.

In which forms are carbon present in the environment?

Q.

Define valency

Q. Select the one which was not found during the origin of life.

1. Ammonia
2. Methane
3. Oxygen
4. Hydrogen

Q. The energy required to remove the valence electrons of an isolated gaseous atom is called ionization energy.

1. True
2. False

Q.

What is the difference between a pigment and a compound? Why is chlorophyll called a pigment?

Q.

Calculate the valency of chlorine.

Q. Which of the following is a biodegradable waste?

1. Plastic
2. Glass
3. Metal scrap
4. Food waste

Q. Most of the fuels are:

1. carbon compounds with sulphur
2. nitrogen compounds with carbon
3. carbon compounds with hydrogen
4. none of the above

Q. All the compounds given below contain carbon atoms except:

1. marble
2. fat molecule
3. wool
4. gypsum

Q. Food chain begins with ________.

1. carnivores
2. herbivores
3. producers
4. decomposers

Q. The valency of carbon is ________.

1. two
2. four
3. one
4. three