The correct order of atomic/ionic radii is:

(1) $Sc>Ti>V>Cr<mspace\; width="1em"></mspace>$                               

(2) $Co>Ni>Cu>Zn$                                      

(3) $S^{2-}>C{l}^{-}>O^2>N^{3-}$                         

(4) None of these

A metal M and its compound can give the following observable changes in a consequence of reactions

M $\underset{{\mathrm{HNO}}_3}{\overset{\mathrm{dilute}}{\to }}$ [Colourless solutions] $\underset{NaOH}{\overset{\mathrm{aqueous}}{\to }}$ [White precipitate] $\underset{NaOH\mathit{\hspace{0.17em}}\mathit{\left(}aq\mathit{\right)}}{\overset{excess}{\to }}$ [Colourless solutions] $\stackrel{{\mathrm{H}}_2\mathrm{S}}{\to }$ [White precipitate]

(1) Mg     

(2) Pb   

(3) Zn   

(4) Sn

Which two sets of reactants best represent the amphoteric character of $\mathrm{Zn}(\mathrm{OH}{)}_2$?

Set 1: $\mathrm{Zn}\left(\mathrm{OH}{)}_2\right(\mathrm{s})<mspace\; width="1em"></mspace>$ and ${\mathrm{OH}}^{-}\left(\mathrm{aq}\right)$

Set 2: $\mathrm{Zn}\left(\mathrm{OH}{)}_2\right(\mathrm{s})<mspace\; width="1em"></mspace>$and ${\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$

Set 3: $\mathrm{Zn}\left(\mathrm{OH}{)}_2\right(\mathrm{s})<mspace\; width="1em"></mspace>$and ${\mathrm{H}}^{+}$(aq)

Set 4: $\mathrm{Zn}\left(\mathrm{OH}{)}_2\right(\mathrm{s})<mspace\; width="1em"></mspace>$and ${\mathrm{NH}}_3\left(\mathrm{aq}\right)$

(a) 1 and 2       (b) 1 and 3     (c) 2 and 4     (d) 3 and 4

Which compound is formed when iron reacts with carbon?

(1) ${\mathrm{FeC}}_2$       

(2) ${\mathrm{Fe}}_3{\mathrm{C}}_{}$     

(3) ${\mathrm{FeC}}_3$   

(4) ${\mathrm{Fe}}_2\mathrm{C}$

$\left(\mathrm{X}\right)+{\mathrm{K}}_2{\mathrm{CO}}_3+\mathrm{Air}\stackrel{\mathrm{heat}}{\to }\left(\mathrm{Y}\right)$
$\left(\mathrm{Y}\right)+{\mathrm{Cl}}_2\stackrel{}{\to }\left(\mathrm{Z}\right)\mathrm{Pink}$

Which of the following is correct?

(a) X= black, ${\mathrm{MnO}}_2$,Y=Blue, ${\mathrm{K}}_2{\mathrm{CrO}}_4$, Z = ${\mathrm{KMnO}}_4$

(b) X= green, ${\mathrm{Cr}}_2{\mathrm{O}}_3$, Y=Yellow ,${\mathrm{K}}_2{\mathrm{CrO}}_4$, Z = ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$

(c) X= black, ${\mathrm{MnO}}_2$, Y = green, ${\mathrm{K}}_2{\mathrm{MnO}}_4$, z = ${\mathrm{KMnO}}_4$

(d) x = black, ${\mathrm{Bi}}_2{\mathrm{O}}_3$, Y = Colourless, ${\mathrm{KBiO}}_2$, z = ${\mathrm{KBiO}}_3$

Consider the following transformation:

$2{\mathrm{CuX}}_2\stackrel{\mathrm{Room}<mspace\; width="1em"></mspace>\mathrm{temperature}}{\to }2\mathrm{CuX}+{\mathrm{X}}_2$

Then ${\mathrm{X}}^{-}$ can be:

(1) ${\mathrm{F}}^{-},<mspace\; width="1em"></mspace>{\mathrm{Br}}^{-}$                         

(2) ${\mathrm{Cl}}^{-},{\mathrm{Br}}^{-}$

(3) ${\mathrm{CN}}^{-},{\mathrm{I}}^{-}$                         

(4) ${\mathrm{Cl}}^{-},{\mathrm{F}}^{-}$

Acidified permanganate solution does not oxidize:

(1) ${\mathrm{C}}_2{\mathrm{O}}_4^{2-}\left(\mathrm{aq}\right)$                   

(2) ${\mathrm{NO}}_2^{-}\left(\mathrm{aq}\right)$

(3) ${\mathrm{S}}^{2-}\left(\mathrm{aq}\right)$                         

(4) ${\mathrm{F}}^{-}\left(\mathrm{aq}\right)$

Which of the following statements is incorrect?

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) ${\mathrm{VOSO}}_4$