Chemistry NCERT Exemplar Solutions Class 12th Chapter Eight

On heating, lead (II) nitrate gives a brown gas (A). The gas (A) on cooling changes to a colourless solid/liquid (B). (B) on heating with NO changes to a blue solid (C). The oxidation number of nitrogen in solid $\left(C\right)$ is:

Which one of the lanthanoids given below is the most stable in divalent form?

In neutral of faintly alkaline medium KMnO₄ being a powerful oxidant can oxidize, thiosulphate almost quantitatively, to sulphate. In this reaction overall change in oxidation state of manganese will be:

In following pairs, the one in which both transition metal ions are colourless is:

Consider the following equations :

$2{\mathrm{F}\mathrm{e}}^{2+}+{\mathrm{H}}_2{\mathrm{O}}_2\to \mathrm{x}\mathrm{A}+\mathrm{y}\mathrm{B}$ (in basic medium)

(in acidic medium)

$2{\mathrm{M}\mathrm{n}\mathrm{O}}_4^{-}+6{\mathrm{H}}^{+}+5{\mathrm{H}}_2{\mathrm{O}}_2\to {\mathrm{x}}^{\mathrm{\text{'}}}\mathrm{C}+{\mathrm{y}}^{\mathrm{\text{'}}}\mathrm{D}+{\mathrm{z}}^{\mathrm{\text{'}}}\mathrm{E}$

(in acidic medium)

The sum of the stoichiometric coefficients $x,y,x^{\mathrm{\text{'}}},y^{\mathrm{\text{'}}}$ and $z^{\mathrm{\text{'}}}$ for products $A,B,C,D$ and $E$ , respectively, is

The incorrect statement(s) among (a) - (c) is (are):

(a) $\mathrm{W}\left(\mathrm{V}\mathrm{I}\right)$ is more stable than $\mathrm{C}\mathrm{r}\left(\mathrm{V}\mathrm{I}\right)$ .

(b) In the presence of $\mathrm{H}\mathrm{C}\mathrm{l}$ , permanganate titrations provide satisfactory results.

Product 'A' of following sequence of reaction is

What will be the major product of following sequence of reactions?

Which of the following is most stable?

Which amongst the given plots is the correct plot for pressure (p) vs density (d) for an ideal gas?