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.

The correct group of halide ions which can be oxidised by oxygen in acidic medium is

Describe the following about halogen family (group 17 elements):

Relative strength of their hydrides

Describe the following about halogen family (group 17 elements):

Relative oxidising power.

The principal products obtained on heating iodine with concentrated caustic soda solution is :

The least stable halogen oxide among given is:

Which of the following is the correct order?

${\mathrm{IF}}_7$ exists but ${\mathrm{BrF}}_7$ does not, why ?

When ${\mathrm{Cl}}_2$ reacts with excess of ${\mathrm{F}}_2, {\mathrm{ClF}}_3$ is formed and not ${\mathrm{FCl}}_3$ ?

Iodine forms ${{\mathrm{I}}_3}^{-}$ but ${\mathrm{F}}_2$ does not form ${{\mathrm{F}}_3}^{-}$ ions. Why ?

${\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3$ reacts with ${\mathrm{Cl}}_2$ and ${\mathrm{I}}_2$ to give different oxidation products. Write the equations of the reactions involved and give a plausible explanation of their contrasting behaviour.

Iodine is liberated when $\mathrm{KI}$ is added to a solution of ${\mathrm{Cu}}^{2+}$ ions but ${\mathrm{Cl}}_2$ is not liberated when $\mathrm{KCl}$ is added to a solution of ${\mathrm{Cu}}^{2+}$ ions. Why?

In aqueous solution, $\mathrm{HI}$ is a stronger acid than $\mathrm{HCl}$?

$\mathrm{F}$ atom is more electronegative than $\mathrm{I}$ atom, yet $\mathrm{HF}$ has lower acid strength than $\mathrm{HI}$. Explain.

Which is a stronger acid in aqueous solution, $\mathrm{HF}$ or $\mathrm{HCl}$?

Hydrogen fluoride is a weaker acid than hydrogen chloride in aqueous solution.

Give an example of a disproportionation reaction of ${\mathrm{F}}_2$ ?

Name the halogen which forms only one oxo acid also write the formula of the oxo acid