Last seen: Oct 19, 2020
(c) 170 Explanation: p°benzene = 0.850 bar; Wbenzene = 39.0g M.W. = 78 g/mol p°solution = 0.845 bar; w = 0.5 g Let n be the no. of moles of ...
(c) 269.07 K Explanation: From the relation 2s.png So, freezing point of glucose solution = 273.15 – 4.085 = 269.07 K
(b) 0.31 mol /L Explanation: π = cRT 7.8 = c x 0.082 x 310 c = 7.8/0.082 x 310 = 0.31 mol /L
(c) Vapour pressure of pure benzene decreases by the addition of naphthalene Explanation: The decrease in vapour pressure of benzene by addition o...
(d) 1198 Explanation: πV = nRT 500/1000 π = 20/m x 0.082 x (273 + 15) 500/1000 x 600/760 = 20/m x 0.082 x 288 m = (20 x 0.082 x 288 x 1000 x...
(c) optical activity Explanation: Optical activity is not dependent upon number of molecules of the compound, so it is not a colligative property.
(d) 17.3 g mol-1 Explanation: ΔT = Kb w/m x 1000/W 0.52 = 0.6 x 3/m x 1000/200 m = 1.8 x 5/0.52 = 17.3 g mol-1
(c) normal molecular mass/observed molecular mass Explanation: Van’t Hoff factor = Normal molecular mass/Observed molecular mass
(b) 0.51°C Explanation: ΔT = Kb w/m 0.170 = Kb 0.450/60 x 1000/22.5 Kb = (0.170 x 60 x 22.5)/1000 x 0.450 = 0.51°C
(b) 5.08 Explanation: ΔTf = Kf x m (5.45 – 3.55) = Kf x 0.374 Kf = 1.9/0.374 = 5.08
(c) 356.3 g Explanation: According to Raoult's law, 2s.png
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect. Explanation: Ionization enthalpy is the energy required to remove an electron from an isolate...
(c) If Assertion is correct but Reason is incorrect. Explanation: Assertion is true but Reason is false. Electron affinity is experimentally me...
(d) If both the Assertion and Reason are incorrect. Explanation: The ionisation energy of N is more than that of O because N has exactly half fill...
(a) Cl, Br, I Explanation: According to the law of triads the atomic wt of the middle element is arithmetic mean of I and III. At wt of Br = (A...
(c) F > N > C > Be > B Explanation: As we move along the period, the atomic size decreases due to increase in nuclear charge. Therefor...
(c) B < C < N < O Increasing first ionization enthalpy Explanation: In a period the value of ionisation potential increases from left t...
(b) B < Be < C < O < N