Which of the following statements is incorrect?

1.	Transition elements exhibit higher enthalpies of atomization as they have stronger interatomic interaction.
2.	${\mathrm{IE}}_2 \mathrm{of} {}_{23}\mathrm{V}<{}_{24}\mathrm{Cr}>{}_{25}\mathrm{Mn} \mathrm{and} {}_{28}\mathrm{Ni}<{}_{29}\mathrm{Cu}>{}_{30}\mathrm{Zn}.$
3.	Ni(II) compounds are more stable than Pt(II) whereas Pt(IV) compounds are more stable than nickel(IV)
4.	The elements which give the greatest number of oxidation states do not occur in or near the middle of the series.

Which of the following is true for the species $3{\mathrm{d}}^4$ configuration ?

(1) ${\mathrm{Cr}}^{2+}$ is reducing in nature                               

(2) ${\mathrm{Mn}}^{3+}$ is oxidising in nature.

(3) Both (A) and (B)                                             

(4) None of these

In which compound does vanadium have an oxidation number of +4?

(A) ${\mathrm{NH}}_4{\mathrm{VO}}_2$                                 

(B) ${\mathrm{K}}_4\left[\mathrm{V}{\left(\mathrm{CN}\right)}_6\right]$

(C) ${\mathrm{VSO}}_4$                                     

(D) ${\mathrm{VOSO}}_4$

Among the following, the species that is both paramagnetic and coloured is :

(A) ${\left[{\mathrm{MnO}}_4\right]}^{2-}$                                     

(B) ${\left[{\mathrm{TiCl}}_6\right]}^{2-}$ 

(C) ${\left[{\mathrm{VO}}_4\right]}^{3-}$                                       

(D) ${\mathrm{CrO}}_2{\mathrm{Cl}}_2$

Arrange the following species in the increasing order of their magnetic properties.

${\mathrm{VCl}}_3$    ${\mathrm{VOSO}}_4$    ${\mathrm{Na}}_3{\mathrm{VO}}_4$       $\left[\mathrm{V}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]{\mathrm{SO}}_4.{\mathrm{H}}_2\mathrm{O}$

  I              II                  III                      IV

(1) III<II<I<IV                                         

(2) III<IV<II<I

(3) II<III<I<IV                                         

(4) IV<I<II<III

Which of the following increasing order of oxidising power is correct for the following species?

           ${{\mathrm{VO}}_2}^{+}, {{\mathrm{MnO}}_4}^{-}, {\mathrm{Cr}}_2{{\mathrm{O}}_7}^{2-}$

(A) ${{\mathrm{VO}}_2}^{+}<{\mathrm{Cr}}_2{{\mathrm{O}}_7}^{2-}<{{\mathrm{MnO}}_4}^{-}$                           

(B) ${{\mathrm{VO}}_2}^{+}<{{\mathrm{MnO}}_4}^{-}<{\mathrm{Cr}}_2{{\mathrm{O}}_7}^{2-}$

(C) ${\mathrm{Cr}}_2{{\mathrm{O}}_7}^{2-}<{{\mathrm{VO}}_2}^{+}<{{\mathrm{MnO}}_4}^{-},$                           

(D) ${\mathrm{Cr}}_2{{\mathrm{O}}_7}^{2-}<{{\mathrm{MnO}}_4}^{-}<{{\mathrm{VO}}_2}^{+}$

In which of the following oxoanions the oxidation state of the central atom is not the same as that of its group number in the periodic table?

(A) ${{\mathrm{MnO}}_4^{}}^{-}$                               

(B) ${\mathrm{Cr}}_2{\mathrm{O}}_7^{2-}$

(C) ${\mathrm{VO}}_4^{3-}$                                 

(D) ${\mathrm{FeO}}_4^{2-}$

At $300°\mathrm{C}, {\mathrm{FeCl}}_3 :$

1. Decomposes into ${\mathrm{FeCl}}_2 \mathrm{and} {\mathrm{Cl}}_2.$               

2. Decomposes into $\mathrm{Fe} \mathrm{and} {\mathrm{Cl}}_2.$

3. Sublimes go give liquid ${\mathrm{FeCl}}_3$                         

4. Sublimes to give gaseous dimmer ${\left({\mathrm{FeCl}}_3\right)}_2.$

Anhydrous ferric chloride is prepared by

(1) Heating hydrated ferric chloride at a high temperature in a stream of air.

(2) Heating metallic iron in a stream of dry chlorine gas.

(3) Reaction of ferric oxide with HCl (aq).

(4) Reaction of metallic iron with HCl (aq).

Anhydrous ferrous sulphate on heating gives :

1. Both ${\mathrm{SO}}_2 \mathrm{and} {\mathrm{SO}}_3$                         

2. ${\mathrm{SO}}_2 \mathrm{only}$

3. ${\mathrm{SO}}_3 \mathrm{only}$                                       

4. ${\mathrm{Fe}}_2{\left({\mathrm{SO}}_4\right)}_3 \mathrm{only}$