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

$\left(A\right)<mspace\; width="1em"></mspace>AsC{l}_3>PC{l}_3>BiC{l}_3>SbC{l}_3$
$\left(B\right)PC{l}_3>AsC{l}_3>SbC{l}_3>BiC{l}_3$
$\left(C\right)<mspace\; width="1em"></mspace>NC{l}_3>PC{l}_3>AsC{l}_3>SbC{l}_3$
$\left(D\right)SbC{l}_3>BiC{l}_3>PC{l}_3>AsC{l}_3$

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

(1)AsF₅

(2) SbF₅

(3) PF₅

(4) None of these

The ionic character of H-X is highest in

(1) HBr

(2) HI

(3) HF

(4)HCl

The strongest acid is

(1) H₃PO₂ 

(2) H₃PO₃ 

(3) H₄P₂O₇ 

(4) H₃PO₄ 

Which of the following HY(hydra-acid of halogen) is the strongest acid, best reducing agent, is the least stable and is easily oxidised

(1) HF

(2) HCl

(3) HBr

(4) HI

The strength of halogen acids, HF, HCl, HBr, and HI varies in the order

1. HF>HCl>HBr>HI

2. HF>HBr>HI>HCl

3. HBr>HI>HCl>HF

4. HI>HBr>HCl>HF