Chemical Properties of Group 17 Elements

Which of the following statements is/are true?

(i) Halogens are strong oxidising agents.

(ii) ${\mathrm{NH}}_3$ is clearly basic while ${\mathrm{PH}}_3$ is only feebly basic.

When sodium reacts with chlorine

A solution of potassium dissolved in bromine is treated with each of the following. Which one would liberate molecular bromine?

Sulphur reacts with chlorine in $1: 2$ ratio to form $\mathrm{X}.\mathrm{X}$ on hydrolysis gives a Sulphur compound$Y$$.$Then the central atom of the anion of $Y$ has__________ hybridization.

Molecular bromine on reaction with three moles of molecular fluorine produces an inter halogen compound. The total number of lone pairs at the central halogen atom is

${\mathrm{HClO}}_4$ is a stronger acid than ${\mathrm{H}}_2{\mathrm{SO}}_4$ due to which of the following reasons?
(i) Oxidation state of $\mathrm{Cl}$ in ${\mathrm{HClO}}_4$ is $+7$ and that of $\mathrm{S}$ in ${\mathrm{H}}_2{\mathrm{SO}}_4$ is $+6$
(ii) $\mathrm{Cl}$ is more electronegative than $\mathrm{S}$
(iii) ${\mathrm{HClO}}_4$ is monobasic, whereas ${\mathrm{H}}_2{\mathrm{SO}}_4$ is dibasic
(iv) ${\mathrm{ClO}}_3$ part of ${\mathrm{HClO}}_4$ can break  $\mathrm{O}-\mathrm{H}$ bond more easily to liberate a proton than ${\mathrm{SO}}_3$ part in ${\mathrm{H}}_2{\mathrm{SO}}_4$

Bleaching powder can be obtained by which of the following reactions?

Which is the most covalent?

Which of the following represents the correct order for oxidizing power of the given species ${\mathrm{ClO}}_4^{-},{\mathrm{BrO}}_4^{-}$ and ${\mathrm{IO}}_4^{-}$ _______

The oxidising action increases in the following order.

Which element of Group-$17$ does not show $+1$ oxidation state?

Fluorine can exist in the oxidation state:

Which one is the strongest reducing agent?

Most powerful oxidizing agent is:

Select correct statement for ${\left(\mathrm{SCN}\right)}_2$ and ${\left(\mathrm{CN}\right)}_2$.

Which of the following does not decolourise iodine ?

${\mathrm{HgCl}}_2$ and ${\mathrm{I}}_2$ both when dissolved in water containing ${\mathrm{I}}^{-}$ ions the pair of species. formed is :-