Point out the incorrect statement among the following :

(1) The oxidation state of oxygen is +2 in OF₂.

(2) Acidic character follows the order H₂O < H₂S < H₂Se < H₂Te.

(3) The tendency to form multiple bonds increases in moving down the group from sulphur to tellurium (towards C and N)

(4) Sulphur has a strong tendency to catenate while oxygen shows this tendency to a limited extent.

Which of the following statements is unacceptable?

(1) Among HClO₃, HClO₄,HClO and HClO₂, HClO₃ is the weakest acid.

(2)Bromide ion can be oxidised to Br₂ by chlorine.

(3) Cl₂O₇ is the anhydride of HClO₄.

(4) Among halide ions, F^- has the highest hydration energy.

Moist ammonia gas is dried over

(1) P₂O₅

(2) Anhydrous CaCl₂

(3)Quick lime

(4)Conc. H₂SO₄

The correct increasing order for the acid strength of nitrogen oxides is: 

1. ${\mathrm{N}}_2\mathrm{O }< \mathrm{NO }< {\mathrm{N}}_2{\mathrm{O}}_{\mathrm{4 }}< {\mathrm{N}}_2{\mathrm{O}}_{\mathrm{3 }}< {\mathrm{N}}_2{\mathrm{O}}_5$

2. ${\mathrm{N}}_2\mathrm{O}$ $< \mathrm{NO }< {\mathrm{N}}_2{\mathrm{O}}_{\mathrm{3 }}< {\mathrm{N}}_2{\mathrm{O}}_{\mathrm{4 }}< {\mathrm{N}}_2{\mathrm{O}}_5$

3. ${\mathrm{N}}_2\mathrm{O}$ $< {\mathrm{N}}_2{\mathrm{O}}_{\mathrm{3 }}< {\mathrm{N}}_2{\mathrm{O}}_{\mathrm{4 }}< {\mathrm{N}}_2{\mathrm{O}}_{\mathrm{5 }}< \mathrm{NO}$

4. $\mathrm{NO }< {\mathrm{N}}_2\mathrm{O}$ $< {\mathrm{N}}_2{\mathrm{O}}_{\mathrm{3 }}< {\mathrm{N}}_2{\mathrm{O}}_{\mathrm{4 }}< {\mathrm{N}}_2{\mathrm{O}}_5$

In the compounds of the type POX₃, the P atom multiple bond is of the type

(1) $p\mathrm{\pi }-\mathrm{p\pi }$

(2) $d\mathrm{\pi }-\mathrm{d\pi }$

(3) $p\mathrm{\pi }-\mathrm{d\pi }$

(4) None of these

Which of the following statement is not true for phosphorus?

Dipole moment is highest for

(1) NCl₃

(2) NBr₃

(3) NI₃

(4) NF₃

The basicity of the acids H₃PO₂, H₃PO₃, H₃PO₄  and H₄P₂O₇ are respectively

(A) 1,2,3,7

(B) 2,3,4,7

(C) 1,2,3,4

(D) 1,2,3,5

The correct order of decreasing Lewis acid strength of trichlorides of group 15 elements is

$\left(A\right) AsC{l}_3>PC{l}_3>BiC{l}_3>SbC{l}_3$
$\left(B\right)PC{l}_3>AsC{l}_3>SbC{l}_3>BiC{l}_3$
$\left(C\right) NC{l}_3>PC{l}_3>AsC{l}_3>SbC{l}_3$
$\left(D\right)SbC{l}_3>BiC{l}_3>PC{l}_3>AsC{l}_3$

Which of the following flourides has the least capacity as fluoride ion acceptor

(1)AsF₅

(2) SbF₅

(3) PF₅

(4) None of these