Calcium phosphate is present in tooth enamel. Its nature is 

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? 

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

$\mathrm{pH}$ is defined as 

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]

Write a balanced chemical equation the following reaction:

Action of dilute sulphuric acid on sodium hydroxide.