Solubility of $\mathrm{Mg}(\mathrm{OH})_2$ is ' S ' $\mathrm{mol} / \mathrm{dm}^3$ its solubility product is equal to
$\mathrm{S}^2$
$27 \mathrm{~S}^4$
$4 \mathrm{~S}^3$
$4 \mathrm{~S}^2$
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 .
$1.2 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$
$1.6 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$
$2.1 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$
$2.5 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$
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