On passing gas ‘X’ through lime water a white insoluble precipitate of ‘P’ is formed but on passing excessof gas ‘X’ the white precipitate disappears due to the formation of soluble salt ‘Q’. Identify ‘X’, ‘P’ and‘Q’. Write the chemical equation for the reactions involved.

On passing gas ‘X’ through lime water a white insoluble precipitat

1.	On passing gas ‘X’ through lime water a white insoluble precipitate of ‘P’ is formed but on passing excessof gas ‘X’ the white precipitate disappears due to the formation of soluble salt ‘Q’. Identify ‘X’, ‘P’ and‘Q’. Write the chemical equation for the reactions involved.
Answer» On passing gas ‘X’ through lime water a white insoluble precipitate of ‘P’ is formed but on passing excess of gas ‘X’ the white precipitate disappears due to the formation of soluble salt ‘Q’. Identify ‘X’, ‘P’ and ‘Q’. Write the chemical equation for the reactions involved.