19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Ethylene glycol is used as an antifreeze in a cold climate. Mass of ethylene glycol which should be added to 4 kg of water to prevent it from freezing at – 6ºC will be (Kf for water = 1.86 K kg mol–1. and molar mass o…
Depression of freezing point for …(i)… is directly proportional to …(ii)… Here, (i) and (ii) refer to
Pure benzene freezes at 5.45ºC at a certain place but a 0.374m solution of tetrachloroethane in benzene freezes at 3.55ºC. The Kf for benzene is
What weight of glycerol should be added to 600 g of water in order to lower its freezing point by 10ºC? (Kf = 1.86ºC m–1). (Molecular mass of glycerol is 92)
Which of the following aqueous solutions has the highest boiling point?
The amount of urea to be dissolved in 500 cc of water (K = 1.86) to produce a depression of 0.186ºC in the freezing point is
The freezing point of a 0.05 molal solution of a non- electrolyte in water is
A solution of urea (mol. mass 56 g mol–1) boils at 100.18ºC at the atmospheric pressure. If Kf and Kb for water are 1.86 and 0.512 K kg mol–1 respectively, the above solution will freeze at
Van’t Hoff factor more than unity indicates that the solute in solution is (Manipal 2008)
Which of the following pair of solutions are expected to be isotonic at the same temperature?
The mixture which shows positive deviation from Raoult’s law is: (NEET 2020)
A plant cell shrinks when it is kept in
Which of the following is a molecular crystal
In graphite, carbon atoms are joined together due to
Particles of quartz are packed by
A crystalline solid
Crystalline solid is
Mostly crystals show good cleavage because their atoms, ions or molecules are
Among solids the highest melting point is established by
Which of the following is an example of covalent crystal solid
Diamond is an example of
Which of the following is an example of ionic crystal solid
Amorphous substances show (1) Short and long range order (2) Short range order (3) Long range order (4) Have no sharp M.P.
Amorphous solids are
Which one of the following forms a molecular solid when solidified?