Chemistry Assertion (A) : Synthetic detergents can lather wen in hard water.Reason (R) : Synthetic detergents form soluble calcium and magnesium salts with hard water. A is false but R is true Both A and R is true but R is not a correct explanation of A A is true but R is false Both A and R is true and R is the correct explanation of A A is false but R is true Both A and R is true but R is not a correct explanation of A A is true but R is false Both A and R is true and R is the correct explanation of A ANSWER DOWNLOAD EXAMIANS APP
Chemistry Where does the oxygen that keeps us alive come from? Oxides of minerals Carbon dioxide Carbonates absorbed from soil Water Oxides of minerals Carbon dioxide Carbonates absorbed from soil Water ANSWER DOWNLOAD EXAMIANS APP
Chemistry In chemical terms, what are alums used for purifying water for drinking purposes ? Double sulphates Hydrated chlorides Nitrates of aluminium Double nitrate Double sulphates Hydrated chlorides Nitrates of aluminium Double nitrate ANSWER DOWNLOAD EXAMIANS APP
Chemistry Brown stains in vessels and clothes indicate the presence of high quantities of ________ in water Manganese None of these Calcium Magnesium Manganese None of these Calcium Magnesium ANSWER DOWNLOAD EXAMIANS APP
Chemistry If water smells bad, then that odour can be removed by adding Alum Activated carbon Deactivated nitrogen Bleach Alum Activated carbon Deactivated nitrogen Bleach ANSWER DOWNLOAD EXAMIANS APP