What is change in oxidation number of ' Mn ' during the decolourisation of acidified potassium permanganate by moist sulfur dioxide?
increases by 2
increase by 5
decrease by 2
decreases by 5
Calculate the energy associated with second orbit of $\mathrm{He}^{+}$.
$-2.18 \times 10^{-18} \mathrm{~J}$
$-4.36 \times 10^{-18} \mathrm{~J}$
$-6.54 \times 10^{-18} \mathrm{~J}$
$-8.72 \times 10^{-18} \mathrm{~J}$
Calculate cryoscopic constant of solvent if 2 g solute having molar mass $80 \mathrm{~g} \mathrm{~mol}^{-1}$ dissolved in 75 g solvent decreases its freezing point by 0.4 K .
$1.2 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$
$1.6 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$
$2.1 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$
$2.5 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$
Identify the order of reactivity of halogens towards alkanes.
$\mathrm{I}_2>\mathrm{Br}_2>\mathrm{Cl}_2>\mathrm{F}_2$
$\mathrm{Br}_2>\mathrm{Cl}_2>\mathrm{F}_2>\mathrm{I}_2$
$\mathrm{F}_2>\mathrm{Cl}_2>\mathrm{Br}_2>\mathrm{I}_2$
$\quad \mathrm{Cl}_2>\mathrm{F}_2>\mathrm{I}_2>\mathrm{Br}_2$
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