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##### Worked Example 1: What is the pH of 0.004 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{HCl} (fully dissociated) at 25^{\circ} \mathrm{C} .

Worked Example 2: The pH of a solution is 9.63. Compute its hydrogen ion concentration.

(b) Give the oxidation number of:(vi) \mathrm{O} in \mathrm{OF}_{2}

Example 2: The oxidation of \mathrm{FeSO}_{4} by \mathrm{KMnO}_{4} in acidic solution

10. Tyndall effect is due to:(a) blockage of beam of light(b) non-scattering of beam of light(c) scattering of beam of light(d) passing through beam of light

6. A hiker walks due east at 4 \mathrm{~km} per hour and a second hiker starting at the same point walks 55^{\circ} north-east at the rate of 5 \mathrm{~km} per hour. How far apart will they be after 3 hours?

\mathrm{Q} 21.4 .675 \mathrm{~g} of a compound with empirical formula \mathrm{C}_{3} \mathrm{H}_{3} \mathrm{O} were dissolved in 212.5 \mathrm{~g} of pure benzene. The freezing point of solution was found 1.02^{\circ} \mathrm{C} less than that of pure benzene. The molal freezing point constant of benzene is 5.1^{\circ} \mathrm{C} . Calculate (i) the relative molar mass and (ii) the molecular formula of the compound.