$$ \text { Match the mixtures listed in Column I with the correct method used for their separation. } $$
| $$ \text { Column I } $$ |
$$ \text { Column I } $$ |
||
|---|---|---|---|
| A | Glycerol from spent Lye | P | Steam distillation |
| B | Mixture of Benzoic acid and Naphthalene dissolved in organic solvent | Q | Distillation |
| C | Aniline & Chloroform | R | Distillation under reduced pressure |
| D | 2- Nitrophenol & 4- Nitrophenol | S | Differential extraction using $\mathrm{NaHCO}_3$ |
$$ A-Q \quad B-R \quad C-S \quad D-P $$
$$ A-Q \quad B-R \quad C-S \quad D-P $$
$$ A-R \quad B-S \quad C-Q \quad D-P $$
$$ A-R \quad B-P \quad C-S \quad D-Q $$
An aqueous solution of an unknown solute " $X$ " is prepared by adding 4.0 g of it into 2.0 moles of water. What is the mass percent of " $X$ " in the aqueous solution?
20
40
15
10
The rate constants for two different reactions, $\mathrm{k}_1$ and $\mathrm{k}_2$ are $10^{16} \cdot \mathrm{e}^{-2000 / \mathrm{T}}$ and $10^{15} \cdot \mathrm{e}^{-1000 / \mathrm{T}}$ respectively. The temperature at which $k_1=k_2$ is
$1000 K$
$\frac{2000}{2.303} K$
$\frac{1000}{2.303} K$
$2000 K$
The hybridisation of atomic orbitals of nitrogen in $\mathrm{NO}_2{ }^{+}, \mathrm{NO}_3{ }^{-}$and $\mathrm{NH}_4{ }^{+}$are respectively
$s p, s p^2, s p^3$
$s p, s p^3, s p^2$
$s p^2, s p^2, s p^3$
$s p^2, s p, s p^3$
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