NCERT Class 8 Science — Chapter 1: Coal and petroleum

Consider the following statements about Coal Gas: 1. It was used for street lighting for the first time in London in 1950. 2. Nowadays, it is primarily used as a source of heat rather than light. 3. It is used as a fuel in industries situated near coal processing plants. Which of the statements given above is/are correct?

With reference to the constituents of petroleum, consider the following statements: 1. Kerosene is primarily used as a fuel for heavy motor vehicles. 2. Lubricating oil is used for lubrication. 3. Paraffin wax is used in ointments and candles. Which of the statements given above is/are correct?

Consider the following statements regarding the formation of petroleum: 1. It is formed from the remains of vegetation on land. 2. It is formed from organisms living in the sea. Which of the statements given above is/are correct?

What is the primary reason petroleum is often referred to as ‘black gold’?