Which one of the following correctly represents Sodium oxide?

Identify the product which represents the solid state in the below reaction.

1. Barium chloride
2. Barium sulphate
3. Sodium chloride
4. Sodium sulphate

The colour of the solution observed after 30 minutes of placing zinc metal to copper sulphate solution is

1. Blue
2. Colourless
3. Dirty green
4. Reddish Brown

On adding dilute sulphuric acid to a test tube containing a metal 'X', a colourless gas is produced when a burning match stick is brought near it. Which of the following correctly represents metal 'X'?

1. Sodium
2. Sulphur
3. Copper
4. Silver