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Chemistry Class - XII 1997
(CBSE)
You are on questions of Set II
Q 1 What values are permitted for the
magnetic quantum number, m for for an electron with angular momentum
number, l=2?
Q 3 Name the metal ion with tri-positive
charge represented by the configuration
1s22s22p63s23p63d6.
Q 4 How is the unit of molar conductivity
arrived at ?
Q 5 Which one among the following is
strongest oxidising agent : ClO4-, BrO4-, IO4-
Q 11 Calculate the kinetic energy of moving
electron which have wavelength of 4.8 pm. (Mass of electron = 9.11 x 10-31
kg, h = 6.63 x 10-34Js)
Q 12 The solubility of Ba(OH)2.8H2O in water
at 288k is 5.6g per 100g of water. What is the molarity of the hydroxide
ions in the saturated solution of barium hydroxide at 288k? (Atomic mass :
Ba=137, O=16, h=1)
Q 14 Consider the following data for the
reaction : A + B -----> Products
| run |
Initial
Concentration |
Initial
Concentration |
Initial
rate(mols-1) |
|
| |
A |
B |
|
|
| 1 |
0.10M |
1.0M |
2.1x10-3 |
|
| 2 |
0.20M |
1.0M |
8.4x10-3 |
|
| 3 |
0.20M |
2.0M |
8.4x10-3 |
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Determine the
order of reaction with respect to A and with respect to B, and the over
all order of the reaction.
Q 27 A
solution containing 12.5g of a non electrolyte substance in 175g of water
gave a boiling point elevation of 0.70K. Calculate the molar mass of the
substance. (Elevation constant for water is Kb=0.52K kg mol-1)
Q 28 (a) The standard potential are given as
: EoCu+2/Cu = 0.34 V and EoAg+/Ag = 0.80 V. Calculate the cell potential
(E) for the cell containing 0.100 M Ag+ and 4.00 M Cu+2 at
298K.
(b) How many hours does it take to reduce 3 mol of Fe3+ to
Fe2+ with 2.00 a current? (R = 8.314 JK-1 ; F = 96,500 C mol-1)
Q 29 A wood piece from an archaeological
source shows a 14C activity which is 10% of the activity found in green
wood. Calculate the age of the wood piece. (tt1/214C = 5770 years).
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