Water is not effective in extinguishing a fire caused by petrol because
1). die flame is too hot for water to cool it down
2). water and petrol react chemically
3). water and petrol are miscible with each other
4). water and petrol are immiscible with each other and petrol which forms the upper layer continues to bum
1. Photo oxidation process is initiated by
2. When iron rusts, its weight ......
4. The common name for the compound having formal NaOH is
5. Which of the following is used for refrigeration
6. Which among the following coal contains 90 per cent of carbon?
7. Which one of the following is known as the 'brown coal'?