Write the basic and acidic radical present in sodium bisulphite.

Given below are two statements:
Statement-I : Methyl orange is a weak acid.
Statement-II : The benzenoid form of methyl orange is more intense/deeply coloured than the quinonoid form.
In the light of the above statement, choose the most appropriate answer from the options given below:

State the differences between cation and anion.

Give examples of metals with variable valency.

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

Cations are _____ charged.

(Chromatography, Valency, Cuprum, Negatively, ${\mathrm{ZnCl}}_2$, one, $\mathrm{ZnS}$, Positively, Separating funnel)

Explain how the element sodium is monovalent.

Identify the odd one out and justify.

Chloride, nitrate, hydride, ammonium.