List of practice Questions

Shown below is an arrangement of closely stacked spheres. Assume each one to be in contact with its immediate neighbour. What is the total number of points where the spheres touch each other?

Which of the following gases has the lowest solubility in water at 298 K?
Hardness of water is estimated by titration with

Calculate the boiling point of a solution containing 18 g of glucose (C\(_6\)H\(12\)O\(_6\)) in 100 g of water. (K₋b = 0.52°C·kg/mol, Molar mass of glucose = 180 g/mol)

Calculate the molality of a solution prepared by dissolving 10 g of NaCl (\( M = 58.5 \, \text{g/mol} \)) in 500 g of water:
What are the mole fractions of glucose and water respectively, in 20% (w/w) aqueous glucose solution? (\(C = 12\,u\); \(O = 16\,u\); \(H = 1\,u\))
A liquid mixture of aniline and 'x' forms a non-ideal solution with negative deviation from Raoult's law. What is 'x'?
The osmotic pressure of 0.01 molar solution of an electrolyte is found to be 0.65 bar at 27°C. The van’t Hoff factor of the electrolyte is (R = 0.083 bar L K$^{-1}$ mol$^{-1}$)

At 298 K, liquid A (solute) forms an ideal solution with liquid B (solvent). The following graph is obtained for this solution.

Identify the correct statements about this graph:
I) x-axis represents the mole fraction of A
II) Point Z represents the vapour pressure of pure solvent
III) x-axis represents the mole fraction of B
 

Consider the following:
Assertion (A): Nitric acid - water mixture is a maximum boiling azeotrope.
Reason (R): Nitric acid - water mixture shows positive deviation from Raoult’s law.
The mole fractions of glucose and water in aqueous glucose solution are 0.0244 and 0.9756 respectively. What is the weight percentage (w/w) of glucose in this solution?
At T(K), the vapour pressure of an aqueous solution of a non-volatile solute,
whose mole fraction is 0.02 is found to be 34.65 mm Hg.
What is the vapour pressure (in mm Hg) of pure water at the same temperature?
In an aqueous glucose solution, the mole fraction of water is 40 times the mole fraction of glucose. What is the weight percentage (w/w) of glucose in the solution?
Benzoic acid molecules undergo dimerisation in benzene. 2.44 g of benzoic acid when dissolved in 30 g of benzene caused depression in freezing point of 2 K. What is the percentage of association of it ? (Given $K_f (C_6H_6) = 5\operatorname{K kg mol^{-1}}$; molar mass of benzoic acid $= 122\operatorname{g mol^{-1}}$)
Two acids A and B are titrated separately. 25 mL of 0.5 M Na$_2$CO$_3$ solution requires 10 mL of A and 40 mL of B for complete neutralisation. The volume (in L) of A and B required to produce 1 L of 1 N acid solution respectively are
The pH of 0.01 M NaOH solution is:
The molarity of a solution containing 4 g of NaOH in 250 mL solution is:
The osmotic pressure of a 0.1 M solution of NaCl at \(27^\circ\)C is (\(R=0.082\) L atm mol\(^{-1}\) K\(^{-1}\)):
The solubility product of AgCl is \(1.8\times10^{-10}\). The solubility in mol/L is:
Compound of which transition metal ion is colourless?
By which of the following is sugarcane sown?
In a coding system, if CAT = 48, DOG = 72, then BIRD = ?
What is the role of technology in Globalisation ?
The number of elements present in the fifth period of the modern periodic table:
What is the product formed when magnesium ribbon is burnt in oxygen?