NCERT Class 12 Chemistry Objective type Questions & Answers
54 The temperature at which 10% aqueous solution of (W/V) of glucose will show the osmotic pressure of 16.4 atom is (R = 0.082 L atom K-1 mol-1)
Answer: 360 K
56 A number of elements are available in earth’s crust but most abundant elements are ___________ .
Answer: Al and Fe
57 In the extraction of chlorine by electrolysis of brine ___________ .
Answer: oxidation of Cl– ion to chlorine gas occurs.
58 When 1 mole of benzene is mixed with 1 mole of toluene (vapour pressure of benzene – 12.8 kPa, Toluene = 3.85 kPa)
Answer: The vapour will contain a higher percentage of benzene.
60 Cone. H2SO4 is 98 % H2SO4 by mass has d = 1.84 g cm-3. Volume of acid required to make one litre of 0.1 M H2SO4 is
Answer: 5.55 mL