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School/+2

Chemistry Class - XII 1999 (CBSE)
You are on questions 1 to 20 of Set I


Q.1 Define an atomic orbital. What does angular momentum quantum number tell about an orbital ? (1 mark)


Q.2 Which one of the two, O-2 or O 2-2 has higher bond order and why?
(1 mark)


Q.3 Define dislocation in crystal. (1 mark)


Q.4 Write an example of neutral molecule which is isoelectronic to CIO-.
(1 mark)

Q.5 Express the relationship between degree of dissociation of an electrolyte and its molar. Conductivity. (1 mark)


Q.6 What for are quaternary ammonium salts widely used? (1 mark)


Q.7 What is meant by Faraday constant? (1 mark)


Q.8 Define the "Ligand". Give an example also. (1 mark)


Q.9 Give an example of the compound in which hydrogen bonding results in the formation of adimer. (1 mark)


Q.10 Write an general formula by which the electronic configurations of the transitions element is represented. (1 mark)


Q.11 Calculate the uncertainty in the position of an electron if the uncertainty in its velocity is 5.7 x 105 ms-1. (h = 6.6 x 10-34 Js and mass of electron = 9.1 x 10-31kg) (1 mark)

.
Q.12 (i) What is the basic building unit of silicates?
(ii) Draw the structure of asbestos (a silicate containing SiO2-3 anions).
(2 marks)


Q.13 State Rault's law. Discuss the factors responsible for the deviation from this low. (2 marks)

Q.14 Calculate the molarity and molality of a 15% solution (by weight) of sulphuric acid of density 1.020 g cm-3. (Atomic masses : H = 1, O = 16, S = 32 amu) (2 marks)


Q.15 Derive the following equation : (2 marks)
D H = DE + ( Dn) RT


Q.16 A first order reaction is 15% complete in 20 minutes. How long will it take to be 60% complete. (2 marks)


Q.17 Calculate the potential of a zinc-zinc ion electrode in which the zinc ion activity is 0.001 M.
(EoZn2+/Zn. = -- 0.76 V, R = 8.314 JK-1 mol-1, F = 96,500 mol-1) (2 marks )


Q.18 Nitric oxide reacts with hydrogen to give nitrogen and water.
2 NO + 2 H2 --> N2 + 2 H2O
The kinetics of this reaction is explained by the following steps :
(i) 2 NO + 2 H2 --> N2 + 2 H2O (slow)
(ii) H2O2 + H2 --> 2 H2O (fast)
What is the predicted rate low ? (2 marks)


Q.19 Write the IUPAC names of the following compounds.
(i)
(ii)


Q.20 Write the reaction involved in the preparation of benzene daizonium chloride. What happens when benzene daizonium chloride reacts with (i) Cu2Cl2 and (ii) phenol ?(Given equation for the reaction) (2 marks)

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