Consider the following information (X=F or Cl)

Molecule     P-X(axial)       P-X(Equitorial) 

                 bond length     bond length

PF_{5                     a                        b}

PF₄CH_{3            c                        d}

PF₃(CH₃)_{2       e                       f}

PCl_{5                   g                      h}

According to information choose the incorrect order of bond length :

(1)g>a>d>b                                             

(2) g>e>f>b

(3) f>d>a>b                                             

(4) c>f>d>b

For which element would $X{H}_3$ be a stable species :

(1) C                                 

(2) Si

(3) P                                 

(4) S

Hydrolysis of one mole of peroxodi-sulphuric acid produces:

(a) two moles of sulphuric acid 

(b) two moles of peroxomono-sulphuric acid

(c) one mole of sulphuric acid, one mole of peroxomono-sulphuric acid

(d) one mole of sulphuric acid, one mole of peroxomono-sulphuric acid and one

      mole of hydrogen peroxide  

Which of the following statements about acid strength is false?

1. $\mathrm{HI}>\mathrm{HBr}>\mathrm{HCl}$                               

2. ${\mathrm{HIO}}_4>{\mathrm{HBrO}}_4>{\mathrm{HCIO}}_4$

3. ${\mathrm{HClO}}_4>{\mathrm{HClO}}_3>{\mathrm{HClO}}_2$                 

4. $\mathrm{HF}>{\mathrm{H}}_2\mathrm{O}>{\mathrm{NH}}_3$ 

Concentrated nitric acid reacts with iodine to give :

(1) $\mathrm{HOI}$                             

(2) $\mathrm{HI}$

(3) ${\mathrm{HIO}}_3$                         

(4) ${\mathrm{HIO}}_4$

Thermally most stable compound is :

(1) ${\mathrm{HOCIO}}_3$                             

(2) ${\mathrm{HOCIO}}_2$

(3) $\mathrm{HOCl}$                                 

(4) $\mathrm{HOCIO}$ 

Which of the following halogen oxide  is used for estimation of carbon monoxide in automobile exhaust gases?

(1) ${\mathrm{Cl}}_2{\mathrm{O}}_7$                                 

(2) ${\mathrm{I}}_2{\mathrm{O}}_5$

(3) ${\mathrm{ClO}}_2$                                   

(4) ${\mathrm{BrO}}_3$

Only iodine forms hepta-fluoride ${\mathrm{IF}}_7$, but chlorine and bromine give Penta-fluorides. The reason for this is :

(1) low electron affinity of iodine

(2) unusual pentagonal bipyramidal structure of ${\mathrm{IF}}_7$

(3) that the larger iodine atom can accommodate more number of smaller fluorine atom around it 

(4) the low chemical reactivity of ${\mathrm{IF}}_7$

Which of the following compounds undergo thermal decomposition to liberate nitrogen gas?

(1) ${\mathrm{NH}}_4{\mathrm{NO}}_2$                                 

(2) ${\mathrm{NaN}}_3$

(3) ${\left({\mathrm{NH}}_4\right)}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$                           

(4) All of the above