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?

           ${{\mathrm{VO}}_2}^{+},<mspace\; width="1em"></mspace>{{\mathrm{MnO}}_4}^{-},<mspace\; width="1em"></mspace>{\mathrm{Cr}}_2{{\mathrm{O}}_7}^{2-}$

(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 $300°\mathrm{C},<mspace\; width="1em"></mspace>{\mathrm{FeCl}}_3<mspace\; width="1em"></mspace>:$

1. Decomposes into ${\mathrm{FeCl}}_2<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{Cl}}_2.$               

2. Decomposes into $\mathrm{Fe}<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{Cl}}_2.$

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 ${\mathrm{SO}}_2<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{SO}}_3$                         

2. ${\mathrm{SO}}_2<mspace\; width="1em"></mspace>\mathrm{only}$

3. ${\mathrm{SO}}_3<mspace\; width="1em"></mspace>\mathrm{only}$                                       

4. ${\mathrm{Fe}}_2{\left({\mathrm{SO}}_4\right)}_3<mspace\; width="1em"></mspace>\mathrm{only}$

${\mathrm{FeCl}}_3.6{\mathrm{H}}_2\mathrm{O}+\mathrm{C}<mspace\; width="1em"></mspace>{\left({\mathrm{CH}}_3\right)}_2{\left({\mathrm{CH}}_3\mathrm{O}\right)}_2\to \mathrm{Products}$

Reaction products are :

(A) ${\mathrm{FeCl}}_3,<mspace\; width="1em"></mspace>{\mathrm{CH}}_3\mathrm{OH}<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{CH}}_3{\mathrm{COCH}}_3$                       

(B) $\left({\mathrm{CH}}_3\mathrm{O}\right)\mathrm{Fe},<mspace\; width="1em"></mspace>\mathrm{HCl}<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{H}}_2\mathrm{O}$

(C) ${\mathrm{FeCl}}_2,<mspace\; width="1em"></mspace>\mathrm{HCl}<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{CH}}_3{\mathrm{COCH}}_3$                             

(D) $\mathrm{Fe}{\left(\mathrm{OH}\right)}_3,<mspace\; width="1em"></mspace>{\mathrm{FeCl}}_3<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{CH}}_3{\mathrm{COCH}}_3$

Excess of Kl reactions with ${\mathrm{CuSO}}_4$ solution and ${\mathrm{Na}}_2{\mathrm{SO}}_4$ solution is added to it. Which of the following statement is incorrect for this reaction ?

(1) Evolved ${\mathrm{I}}_2$ is reduced                                     

(2) ${\mathrm{Cul}}_2$ is formed

(3) ${\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3$ is oxides                                         

(4) ${\mathrm{Cu}}_2{\mathrm{l}}_2$ is formed.