Answer: A mixture of concentrated nitric and hydrochloric acids. It is a highly corrosive liquid able to attack gold and other resistant substances.
Question: Plaster of Paris should be stored in a moisture-proof container. Explain why?
Answer: Plaster of paris should be stored in moisture proof container because Plaster of paris is powdered form of gypsum with less water of crystallization. But when we keep in open it will react with water to for hard solid mass Gypsum.
CaSO4. 1/2H2O + 3/ H2O ------- > CaSO4. 2H2O
Question: Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid (HCl) is added to test tube A, while acetic acid (CH3COOH) is added to test tube B. Amount and concentration taken for both the acids are same. In which test tube will the fizzing occur more vigorously and why?
Answer:-In test tube A fizzing occur more vigorously. Because HCl is stronger acid than acetic acid. Hence, HCl liberates hydrogen gas more vigorously, which causes fizzing more vigorously.