B SMART TUITION
XII CHEMISTRY CT-1
16/6/2024(Sunday)
25 MARKS
1hour
MCQ
(5)
Q.1. Which of following solution will exhibit highest osmotic pressure? _____________
a. 1M NaCl b. 1M BaCl2 c. 1M AlCl3 d. 1M Al2(SO4)3
Q.2. The molarity of pure water is _______
a. 18 b. 5.56 c. 55.6 d. 100
Q.3.The number of octahedral sites per sphere in fcc structure is _________
a. 1 b. 2 c. 4 d. 5
Q.4.Diamond is a ____________
a. metallic crystal b. covalent crystal c. ionic crystal d. molecular crystal
Q.5. Which of the following is not a colligative property?
a. vapour pressure b. elevation in boiling point c. depression in freezing point d. osmotic pressure
Q.6. Derive an expression.
(2)
Q.7. Differentiate between hexagonal close packing and square close packing.
(2)
Q.8. Give reason.
(8)
a. Solid ice is lighter than water.
b. Pressure cooker reduces cooking time.
c. In cold countries salt is sprinkled over icy roads and footpath.
d. Packing efficiency of ccp crystal is highest amongst all.
Q.9. Niobium is found to crystallize with the structure and found in have density of 8.55 gcm-3. Determine the
atomic radius of niobium if its atomic mass is 93. (2)
Q.10. An element A and B constitute bcc type crystalline structure. Element A occupies body centre position and B is
at the corners of cube. What is the formula of the compound? What are the coordination numbers of A and B? (2)
Q.11. A solution is prepared from 26.2X10-3 kg of an unknown substance and 112.0X10-3 kg acetone at 113K. the
vapour pressure of pure acetone at this temperature is 0.526 atm. Calculate the vapour pressure of substance (the
molar mass of substance is 272.52X10-3 kgmol-1. (Given: atomic masses C=12, H=1, O=16)
(2)
Q.12. 30 g of glucose dissolve in one litre of water has an osmotic pressure 4.91 atm at 303K. if the osmotic pressure
of the glucose solution is 1.5 atm at the same temperature, what would be its concentration? (molar mass of glucose
is 180 gmol-1)
(2)
OR
o
Boiling point of solvent is 80.2 C. When 0.419 g of the solute of molat mass 252.4 g mol-1 was dissolved in 75 g of
the solvent, the boiling point of solution was found to be 80.256 oC. Find the molal elevation constant.
(2)