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Chemistry Class - XII 1997
(CBSE)
You are on questions of Set III
Q 2 Which one out of
O+2 and O-2 is more stable.
(1 mark)
Q 5 How is the unit of molar
conductivity arrived at ? (1 mark)
Q 6 Which one among the following is
strongest oxidising agent : (1
mark)
ClO4-, BrO4-,
IO4-
Q 12 The solubility of
Ba(OH)2.8H2O in water at 288k is 5.6g per 100g of
water. What is the morality of the hydroxide ions in the saturated
solution of Barium hydroxide at 288k? (Atomic mass : Ba=137, O=16, h=1)
(2 marks)
Q 16
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. (2 marks)
Q 18 What are lipids? Describe their two
main function. (2 marks)
Q 19 Mention which of the following are addition polymer : (i) Terylone
(ii) Nylon-66 (iii) Neoprene (iv) Teflon (2
marks)
Q 24 Write an ionic equation to
represent the oxidising action of Cr2O72-
in acidic medium. Also draw a structure of
Cr2O72- (2 marks)
Q 27 (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 0.100M 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) (3
marks)
Q 29 A wood piece from an archaeological
source shows a 140C activity which is 10% of the activity found
in green wood. Calculate the age of the wood piece.
(tt1/214C = 5770 years). (3 marks )
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