Which of the following non-metals reacts and catches fire on exposure to air?

Which of the following reacts with cold water vigorously?

The metal which produces hydrogen gas on reaction with dilute hydrochloric acid as well as sodium hydroxide solution is

Genearlly metallic oxides are baisc and non-metallic oxides are acidic in nature. Solution of which of the following oxides in water will change the colour of blue litmus to red?

Which of the following property is not responsible for copper to be used as electrical conductive wires?