d and f Block Elements · Chemistry · JEE Advanced
MCQ (More than One Correct Answer)
The pair(s) of diamagnetic ions is(are)
The pairs of ions where BOTH the ions are precipitated upon passing H2S gas in presence of dilute HCl, is(are)
The correct statements about Cr2+ and Mn3+ is(are) (Atomic numbers of Cr = 24 and Mn = 25)
For the given aqueous reactions, which of the statement(s) is(are) true?
MCQ (Single Correct Answer)
In the following reaction, sequence in aqueous solution, the species X, Y and Z, respectively, are
$${S_2}O_3^{2 - }\buildrel {A{g^ + }} \over \longrightarrow \mathop X\limits_{Clear\,solution} \buildrel {A{g^ + }} \over \longrightarrow \mathop Y\limits_{White\,precipitate} \buildrel {With\,time} \over \longrightarrow \mathop Z\limits_{Black\,precipitate} $$
Upon treatment with ammoniacal H2S, the metal ion that precipitates as a sulphide is
The colour of light absorbed by an aqueous solution of CuSO4 is
Numerical
$$H$$ atom, $$N{O_2}$$ monomer, $${O_2}^ - $$ (superoxide), dimeric sulphur in vapor phase, $$M{n_3}{O_4},\,\,$$ $${\left( {N{H_4}} \right)_2}\left[ {FeC{l_4}} \right],$$ $${\left( {N{H_4}} \right)_2}\left[ {NiC{l_4}} \right],\,$$ $$\,{K_2}Mn{O_4},\,$$$${K_2}Cr{O_4}$$
The oxidation number of Mn in the product of alkaline oxidative fusion of MnO$$_2$$ is ___________.