In a chemistry laboratory, a research scholar while conducting an experiment , observed at a certain step, that a yellow coloured gas (X) was released and it has been found to be poisonous. This was later made to react with a highly reactive metal (Y). A new compound (Z) was formed which is used for preservation of fish, meat and pickles. The professor asked him to identify X, Y and Z.

Explanation

A greenish yellow poisonous gas X is chlorine. On reaction with the metal sodium (highly reactive metal) chlorine gas forms sodium chloride which is used for preservation of fish, meats and pickles. So, Z is sodium chloride, X is chlorine gas and Y is sodium metal.