Which of the following sets of quantum numbers is not allowed?
The depression in freezing point observed for a formic acid solution of concentration $$0.5 \mathrm{~mL} \mathrm{~L}^{-1}$$ is $$0.0405^{\circ} \mathrm{C}$$. Density of formic acid is $$1.05 \mathrm{~g} \mathrm{~mL}^{-1}$$. The Van't Hoff factor of the formic acid solution is nearly : (Given for water $$\mathrm{k}_{\mathrm{f}}=1.86\, \mathrm{k} \,\mathrm{kg}\,\mathrm{mol}^{-1}$$ )
$$20 \mathrm{~mL}$$ of $$0.1\, \mathrm{M} \,\mathrm{NH}_{4} \mathrm{OH}$$ is mixed with $$40 \mathrm{~mL}$$ of $$0.05 \mathrm{M} \mathrm{HCl}$$. The $$\mathrm{pH}$$ of the mixture is nearest to :
(Given : $$\mathrm{K}_{\mathrm{b}}\left(\mathrm{NH}_{4} \mathrm{OH}\right)=1 \times 10^{-5}, \log 2=0.30, \log 3=0.48, \log 5=0.69, \log 7=0.84, \log 11= 1.04)$$
Match List I with List II
List I | List II | ||
---|---|---|---|
(A) | N$$_2$$(g) + 3H$$_2$$(g) $$ \to $$ 2NH$$_3$$(g) | (I) | Cu |
(B) | CO(g) + 3H$$_2$$(g) $$ \to $$ CH$$_4$$(g) + H$$_2$$O(g) | (II) | Cu/ZnO $$ - $$ Cr$$_2$$O$$_3$$ |
(C) | CO(g) + H$$_2$$(g) $$ \to $$ HCHO(g) | (III) | Fe$$_x$$O$$_y$$ + K$$_2$$O + Al$$_2$$O$$_3$$ |
(D) | CO(g) + 2H$$_2$$(g) $$ \to $$ CH$$_3$$OH(g) | (IV) | Ni |
Choose the correct answer from the options given below :