Which of the following non-metal is a liquid?

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: 86 Which of the following metal exists in the liquid state? 88 Which of the following pair of reactants can undergo a displacement reaction under appropriate conditions? 89 An element E forms an oxide E₂O. An aqueous solution of E₂O turns red litmus paper blue.

(a) What is the nature of the oxide E₂O?

(b) State whether element E is a metal or a non-metal.

(c) Give one example of an element like E.