MCQ
Zinc is obtained from ZnO by ____________.
- ✓Carbon reduction
- BReduction using silver
- CElectrochemical process
- DAcid leaching
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| Column - I | Column - II |
| A. $CCl _3 NO _2$ | 1. Diuretic |
| B. $C _6 H _5 NO _2$ | 2. Fuel additive |
| C. $C _2 H _5 NO _2$ | 3. Insecticide |
| D. $C _2 H _5- O - N = O$ | 4. Explosive |
The hydrogen ion concentration of a buffer solution consisting of a weak acid and its salts is given by
$
\left[ H ^{+}\right]= K _{ a } \frac{[ acid ]}{[\text { salt }]}
$
$
\left.\left[ H ^{+}\right]= K _{ a } \text { [salt }\right]
$
$
\left[ H ^{+}\right]= K _{ a } \text { [acid] }
$
$
\left[ H ^{+}\right]= K _{ a } \frac{[\text { salt }]}{[\text { acid }]}
$