Is demineralised or distilled water useful for drinking purposes? If not, how can it be made useful?

Distillation is used for the refining of

Denatured spirite is used for industrial purposes. What is dentured spirit?

There are two compounds of sodium whose formulae are different by one H atom. Both the compounds can be prepared by the same process. One compound can be used for washing purpose and other can be used in fire extinguishes. Name the method of preparation.

There are two compounds of sodium whose formulae are (anhydrous form) different by one H- atom. Both the compounds can be prepared by the same process. One compound can be used for washing purpose and other one can be used in fire extinguishes. (a) Identify the compounds? (b) Name the method of preparation?

There are two compounds of sodium whose formulae are different by one H atom. Both the compounds can be prepared by the same process. One compound can be used for washing purpose and other can be used in fire extinguishes. Identify the compounds?