Detergents used for cleaning clothes and utensils contain
1). nitrates
2). bicarbonates
3). sulphonates
4). bismuthates
1. Solder metal is an alloy of
2. German silver is an alloy of
3. Extensively used nitrogenous fertilizer is
4. Which one of the following metals is used to galvanise iron
5. "Firefighting clothes" are made from
6. Fermentation of milk to curd is due to :
7. Iron and manganese present as pollutants in water cannot be removed by_____