# First Year Chemistry Solutions

Change the way you learn with Maqsad's classes. Local examples, engaging animations, and instant video solutions keep you on your toes and make learning fun like never before!

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

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

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

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

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

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