With F highest stable oxidation state of Mn is

Cr₂O₇^2-+X$\stackrel{{\mathrm{H}}^{+}}{\to }$Cr³⁺+H₂O + oxidized product of X. X in the above reaction cannot be

Basic oxide amongst the following is:

The pair having similar magnetic moment is

Lanthanoid which is radioactive is

Actinide contraction is mainly related to :-

The most basic hydroxide among the following is -

Which is colorless in water?

CrO₄^2- and MnO₄^- are strong yellow and intense purple  respectively in aqueous solution The darkening of colour is due to

In the dichromate ion Cr₂O₇^2-,

Electronic configuration of a transition element X in +3 Oxidation state is [Ar]3d⁵.

What is its atomic number?

Magnetic moment of K₃[Fe(CN)₅(H₂O)] is

Name the gas that can readily decolourise acidified KMnO₄ solution.

HgCl₂ and I₂ both when dissolved in water containing I^- ions the pair of species formed is

(a) HgI₂, ${\mathrm{I}}_3^{-}$                              (b) HgI₂, I^-

(c) ${\mathrm{HgI}}_4^{2-}, {\mathrm{I}}_3^{-}$                             (d) Hg₂I₂, I^-

A pair among the following has the same size is -

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] $\underset{NaOH\mathit{ }\mathit{\left(}aq\mathit{\right)}}{\overset{excess}{\to }}$ [Colourless solutions] $\stackrel{{\mathrm{H}}_2\mathrm{S}}{\to }$ [White precipitate]

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

Set 1: $\mathrm{Zn}\left(\mathrm{OH}{)}_2\right(\mathrm{s})$ and ${\mathrm{OH}}^{-}\left(\mathrm{aq}\right)$

Set 2: $\mathrm{Zn}\left(\mathrm{OH}{)}_2\right(\mathrm{s})$and ${\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$

Set 3: $\mathrm{Zn}\left(\mathrm{OH}{)}_2\right(\mathrm{s})$and ${\mathrm{H}}^{+}$(aq)

Set 4: $\mathrm{Zn}\left(\mathrm{OH}{)}_2\right(\mathrm{s})$and ${\mathrm{NH}}_3\left(\mathrm{aq}\right)$

Which compound is formed when iron reacts with carbon?

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

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:

Acidified permanganate solution does not oxidize:

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

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

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

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

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?

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

Anhydrous ferric chloride is prepared by

Anhydrous ferrous sulphate on heating gives :