4. Metallic oxide turn litmus to .

Explanation:

Metal oxides are generally basic in nature.

When metal oxides react with acid they form respective metal salt and water.

Acid + Metal Oxide => Salt + Water

Neutralization Reaction :

Acid + Base => Salt + Water

This is similar to neutralization reaction where base comes instead of Metal oxide. Hence it can be concluded that Metal oxide is a base.

So Bases turn Red litmus to blue.

Hence the solution of any metal oxide will turn Red litmus to Blue but it has no effect on the Blue Litmus paper.

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

the food using pesticides in the future will harm you by giving you diseases like cancer or something since they have things that we should not eat in it like chemicals or pesticides. that is why organic food is more expensive because they take the time to make it right and healthy for you to eat.

explanation: