Give the preparation method of the following compound:
`Na_2CO_3`

Give the preparation method of the following compound: NaHCO_3

Give the preparation method of the following compound: CaCO_3

Select the best method for the preparation of the following compounds :

Which one of the following compounds on reaction with Na_(2)O_(3) in alkaline medium gives yellow colour solution?

give one method of preparation of Na_(2)B_(4)O_(7)

The laboratory method of preparation of CO is