Hydrogen gas is not widely used as a reducing agent because

A student puts one big iron nail each in four test tubes containing solutions of zinc sulphate, aluminium sulphate, copper sulphate and iron sulphate. A reddish brown coating was observed only on the surface of iron nail which was put in the solution of

Which of the following reactions not occur?

Alloys are homogeneous mixtures of a metal with a metal or non-metal. Which among the following alloys contain non-metal as one of its constituents?

E is an element that's ore is rich in E₂O₃. E₂O₃ is not affected by water. It forms two chlorides, ECl₂ and ECl₃ The element E is