An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be:

81 A metal less reactive and another metal more reactive than hydrogen are : 82 An element E reacts with water to form a solution which turns phenolphthalein solution pink. The element E is most likely to be : 84 Which one of the following four metals would be displaced from the solution of its salt by the other three metals? 85 An element is soft and can be cut with a knife. It is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be: