p-Block Elements

Which among the following is NOT in accordance with the property stated against it?

Choose the pair of elements $[(\mathrm{A})$ to $(\mathrm{F})]$ which:
(i) belong to the Chalcogen family
(ii) form monovalent oxides which give alkalies in aqueous solution
(iii) form stable monovalent anions
(A) $1 s^2 2 s^2 2 p^6 3 s^2 3 ...

The order of acidic strength of boron trihalides is

Given are \(\mathrm{H}_3 \mathrm{PO}_2, \mathrm{H}_3 \mathrm{PO}_3, \mathrm{H}_3 \mathrm{PO}_4\) and \(\mathrm{H}_4 \mathrm{P}_2 \mathrm{O}_7\). Which of the above oxacids results into two series of salts?

The cololur of CrO\(_4^{2-}\) changes to Cr\(_2\)O\(_7^{2-}\) is

Give the correct order of acidity of

Arrange the hydrides of group 15 in correct decreasing order of reducing nature.

When conc. H\(_2\)SO\(_4\) is heated with P\(_2\)O\(_5\), the acid is converted into