When zinc metal is treated with a dilute solution of a strong acid, a gas is evolved, which is utilised in the hydrogenation of oil. Name the gas evolved. Write the chemical equation of the reaction involved and also write a test to detect the gas formed.

A metal is treated with dilute sulphuric acid. The gas is collected by the method shown in figure ahead. Answer the following: Name the gas.

Write the chemical equation for the action of atmosphere CO_2 gas on bleaching powder when exposed in open.

A piece of zinc metal is dropped in dilute solution of hydrochloric acid. Answer the following: How will you test the presence of the gas evolved?

when a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube Write a balanced chemical equation to represent the above reaction.

What happens when an aqueous solution of sodium sulphate reacts with an aqueous solution of barium chloride? State the physical conditions of reactants in which the reaction between them will not take place. Write the balanced chemical equation for the reaction and name the type of reaction.

A piece of zinc metal is dropped in dilute solution of hydrochloric acid. Answer the following: Which gas is liberated when the metal reacts with the acid?

A brown substance 'A' on heating in air forms a substance 'B'. When hydrogen is passed over heated B, it changes back to A. Write chemical equations for the reactions.