The nature of calcium phosphate present in tooth enamel is

Choose the method of preparation of Sodium nitrate, from the methods given in the list:

[List: A. Neutralization B.Precipitation C.Direct combination D.Substitution]

A milkman adds a very small amount of baking soda to fresh milk.

Why does he shifts the pH of the fresh milk from 6 to slightly alkaline?

Write a balanced chemical equation the following reaction:

Action of dilute sulphuric acid on sodium hydroxide.

Which of the following pair of compounds cannot exist together in a solution? 

A milkman adds a very small amount of baking soda to fresh milk.

Why does this milk take a long time to set as curd?

An equal volume of molar hydrochloric acid and sulphuric acid is neutralised by dilute $\mathrm{NaOH}$ solution and $\mathrm{x} \mathrm{Kcal}$  and $\mathrm{y} \mathrm{Kcal}$ of heat are liberated. Which of the following is true?