Given, $\Delta G^{\circ}=-502 \mathrm{~kJ} \mathrm{~mol}^{-1}$ for the dissociation of ,
$\mathrm{Mg}(\mathrm{OH})_2(s) \rightleftharpoons \mathrm{Mg}^{2+}(a q)+2 \mathrm{OH}^{-}(a q)$ at 298 K . Find the $K_{\mathrm{sp}}$ value.
$(R=8314 \mathrm{~J} / \mathrm{mol} \cdot \mathrm{K})$
$1.2 \times 10^{-9}$
$7.9 \times 10^{-8}$
$4.1 \times 10^{-10}$
$2.6 \times 10^{-7}$
Which of the following is a water-soluble vitamin?
Vitamin A
Vitamin K
Vitamin C
Vitamin D
In a first-order reaction, the initial concentration of $A$ is $0.5 \mathrm{~mol} \mathrm{~L}^{-1}$. After 20 minutes, the concentration reduces to $0.4 \mathrm{~mol} \mathrm{~L}^{-1}$. The rate constant is (in $\mathrm{min}^{-1}$ ).
0.0051
0.0112
0.025
0.051
An unknown ester is hydrolysed to give ethanol as one of the products. Which chemical test can be used to confirm the identity of this alcohol?
2,4-DNP test
Tollen's test
lodoform test
Schiff's test
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