Oxyacids of Phosphorus: Preparation, Structure, Properties and Uses

The number of $\mathrm{P}-\mathrm{O}-\mathrm{P}$ bonds in ${\mathrm{H}}_4{\mathrm{P}}_2{\mathrm{O}}_7, {\left({\mathrm{HPO}}_3\right)}_3$, and ${\mathrm{P}}_4{\mathrm{O}}_{10}$ are respectively

What is the ratio of $\mathrm{\sigma } \mathrm{and} \mathrm{pi}$ bonds in pyrophosphoric acid?

The strong reducing property of hypophosphorous acid is due to

The strongest reducing agent among the given options is

The number of $\mathrm{P}-\mathrm{O}-\mathrm{P}$ bonds in the structure of phosphorus pentoxide and phosphorus trioxide are respectively.

For ${\mathrm{H}}_3{\mathrm{PO}}_3$ and ${\mathrm{H}}_3{\mathrm{PO}}_4$, the correct choice is

Among oxoacids of phosphorus, the best reducing agent is

Phosphorous forms different oxyacids such as, hypophosphorous acid $\left({\mathrm{H}}_3{\mathrm{PO}}_2\right)$, orthophosphorous acid $\left({\mathrm{H}}_3{\mathrm{PO}}_3\right)$ and orthophosphoric acid $\left({\mathrm{H}}_3{\mathrm{PO}}_4\right)$. Orthophosphorous acid on heating forms orthophosphoric acid, which on heating first forms pyrophosphoric acid $\left({\mathrm{H}}_4{\mathrm{P}}_2{\mathrm{O}}_7\right)$ and on further heating forms polyphosphoric acid. The correct statement is.

Select the incorrect statement about the oxyacids of phosphorus.

The chemical formula of the compound that contains one $\mathrm{P}-\mathrm{OH},$ two $\mathrm{P}-\mathrm{H}$ and One $\mathrm{P}=\mathrm{O}$ bond in its one molecule is

The correct order of acidic strength is

Cyclotrimeta phosphoric acid has total number of $\mathrm{P}=\mathrm{O} \& \mathrm{P}-\mathrm{O}$bonds respectively

Which is dibasic?

Number of $\mathrm{S}=\mathrm{O}$ bonds in pyrosulphuric acid are

In ${\mathrm{P}}_4{\mathrm{O}}_{10}$ the number co-ordinate bonds is

Phosphorus reacts with chlorine gas to give a colourless liquid, which fumes in moist air to produce $\mathrm{HCl}$ and

The order of the oxidation state of the phosphorus atom in $H_{3}P{O}_2, H_{3}P{O}_4, H_{3}P{O}_3$ and $H_4{P}_2{O}_6$ is

What is the chemical formula of hypophosphorous acid?

Decreasing order of number of ionisable hydrogen atoms in the following molecules is

$\left(\mathrm{i}\right)$ ${\mathrm{H}}_3{\mathrm{PO}}_4$
$\left(\mathrm{ii}\right)$ ${\mathrm{H}}_3{\mathrm{PO}}_3$
$\left(\mathrm{iii}\right)$ ${\mathrm{H}}_3{\mathrm{PO}}_2$
$\left(\mathrm{iv}\right)$ ${\mathrm{H}}_4{\mathrm{P}}_2{\mathrm{O}}_6$

For next two question please follow the same

Phosphorus forms a number of oxoacids which differ in their structures and oxidation state of phosphorus. All the acids contain phosphorus atom/atoms linked tetrahedrally to four other atoms or groups. Each of them has at least one P = O or $\text{P} \to \text{O}$ unit and one P - OH unit. The -OH group is ionisable but H atom linked directly to P is non-ionisable. Structures of all the  acids are considered to be derived either from phosphorus acid or phosphoric acid.

Which one is mono-basic acid?