Chemistry
The function of skimming tank in sewage treatment is to remove

Suspended solids
Oil and fatty substances
Gritty substances
Inorganic substances

ANSWER DOWNLOAD EXAMIANS APP

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

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

ANSWER DOWNLOAD EXAMIANS APP