The electronic configuration of $Cs$ is

The alkali metal halides are soluble in water but $LiF$ is insoluble because

Which metal gives $NH_4NO_3$ when it reacts with very dilute $HNO_3$ acid?

Which element from the following has the highest negative standard reduction potential?

Sodium is heated in air at $300^{\circ} C$ to form $X$. $X$ absorbs $CO_2$ and forms $Na_2CO_3$ and $Y$. Which of the following is $Y$?

Magnesium burns in an atmosphere of $CO_2$ because ...