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❓ Question When 81 g of aluminium is allowed to react with 128 g of oxygen gas , find the mass of aluminium oxide ( A l 2 O 3 ) (Al_2O_3) ( A l 2…

❓ Question Consider the following reaction occurring in a blast furnace: F e 3 O 4 ( s ) + 4 C O ( g ) → 3 F e ( l ) + 4 C O 2 ( g ) Fe_3O_4(s)+4…

❓ Question The density of a 3 M NaCl solution is 1.25 g mL⁻¹ . Find the molality of the solution . ✍️ Solution Given molarity: M = 3 M M=3\t…

❓ Question 20 mL of 2 M NaOH solution is added to 400 mL of 0.5 M NaOH solution . Find the final concentration of the solution. ✍️ Solution Mo…

❓ Question A hydrocarbon X X has a molar mass of 80 g mol⁻¹ and contains 90% carbon by mass . Find the degree of unsaturation of the hydrocarbo…

❓ Question The elemental composition of a compound is 54.2% C, 9.2% H and 36.6% O . If the molar mass of the compound is 132 g mol⁻¹ , find its mo…

❓ Question If F = k G x h y c z F=kG^x h^y c^z where G G is the gravitational constant , h h is Planck's constant , c c is the speed of li…

❓ Question In the SI unit system , density is d 1 = 128 kg/m 3 d_1=128\ \text{kg/m}^3 In another unit system, the unit of length is 25 cm 25\t…

❓ Question The percentage error in acceleration due to gravity g g is 4 % 4\% , and the percentage error in time period T T is 3 % 3\% . For a …

❓ Question The radius of a sphere is measured as r = ( 7.50 ± 0.85 ) cm r=(7.50\pm0.85)\text{ cm} Find the percentage error in the volume of the…

❓ Question Given, R = V I where, V = ( 50 ± 2 ) V V=(50\pm2)\,V and I = ( 20 ± 0.2 ) A I=(20\pm0.2)\,A If the percentage error in resistanc…