Chemistry
The advantage of detergents over soaps is

Detergents give lather even with hard water
Soaps give lather with only soft water
Detergents could not give much lather
Detergents are soluble in water

ANSWER DOWNLOAD EXAMIANS APP

Chemistry
Water is not effective in extinguishing a fire caused by petrol because

The flame is too hot for water to cool it down
Water and petrol are miscible with each other
Water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn
Water and petrol react chemically

ANSWER DOWNLOAD EXAMIANS APP