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Chemistry Class -
XII 1998 (CBSE)
You are on Set no 2 Questions
Q3)
Write the IUPAC name of
[Ni(CN)4]2- ion. (Marks 1)
Q4)
Write the IUPAC name of : (Marks
1)
Q6)
Complete the nuclear reaction expression :
(Marks 1)
13AI27( ,n)....
Q9)
Why do azo dyes not impart fast colour to
fabrics? (Marks 1)
Q11)
Calculate the cell potential of the given cell
at 25oC. ( R = 8.31 JK-1 mol-1 F = 96500
C mol-1)
Ni(s) | Ni2+ (0.01 M) || Cu2+
(0.1 M) | Cu(s)
[Given
EoCu2+/Cu = +0.34 V ;
EoNi2+/Ni = -0.25 V]
(Marks 2)
Q16)
The half-life of C-14 is 5600 years. A sample of
freshly cut wood from a tree contains 10 mg of C-14. How much C-14 will
remain in the wood sample after 56,000 years? (Marks 2)
Q17)
Illustrate elevation in boiling point with the
help of vapour pressure - temperature curve of a solution. Show that
elevation in boiling point is a colligative property. (Marks
2)
Q22)
How is XeO3 obtained ? Write the
related chemical equations. Draw the structure of XeO3.
(Marks 2)
Q26)
How are the following conversions carried
out?
(i) Acetic acid to methylamine
(ii) Acetaldehyde to
methane
Write reactants and reaction conditions. (Marks
2)
Q30)
A solution of sucrose (molar mass = 342 g) has
been prepared by dissolving 68.4 g of sucrose in one kg of water.
Calculate the following :
(i) the vapour pressure of the solution at
298 K,
(ii) osmotic pressure of the solution at 298 K,
(iii)
freezing point of the solution.
[ Given : vapour pressure of water at
298 K = 0.024 atm., Kf for water = 1.86 K kg mol-1 R
= 0.082 L atm mol-1 K ] (Marks 3)
Q31)
(a) Write the balanced equations for the
following reactions :
(i) B2H6 + NaH .gif)
(ii) XeF6 + NaF
(b) Discuss two similar and two dissimilar properties from
the chemistry of nitrogen and that of phosphorus. (Marks
3)
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