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IGNOU INORGANIC CHEMISTRY: CHE-02 December, 2017 Solved Question Paper
Note: (i) Answer all the five questions.
(ii) All questions carry equal marks.
Q1. Answer any ten parts of the following:
(a) Which of the following has the highest electron affinity?
F, Cl, Br, l
(b) Is acetylene an ionic or covalent hydride?
(c) What is the other name for borazine?
(d) What is water gas?
(e) Which property of germanium makes it useful in infrared windows, prisms and lenses?
(f) What is the structure of the unit found in silicates?
Ans. Refer to Chapter CLICK HERE FULL ANSWER
(g) In liquid ammonia, state whether behaves as an acid or a base.
Ans. behaves as an acid in liquid ammonia.
(h) According to VSEPR theory, what is the shape of molecule?
Ans. Refer to Chapter CLICK HERE FULL ANSWER
(i) What is the electronic configuration of chromium?
Ans. Refer to Chapter-11, Q.No.-3 CLICK HERE FULL ANSWER
(j) Is sulphate ion a monodentate or a bidentate ligand?
(k) Which of the following is the strong field ligand?
(l) Name the process by which sulphide ore of copper is concentrated.
Q2. Answer any five parts of the following:
(a) What is the electronic configuration of phosphorus? From that, explain how we can infer whether it is a metal or a non-metal.
(b) Explain why in alkali metals, the second ionisation energies are much higher than the first.
(c) What are the two different forms of hydrogen and what type of isomerism is present between them?
Ans. Refer to Chapter-2, Q.No.-7 CLICK HERE FULL ANSWER
(d) Why does the solubility of the sulphates in water decrease down the group for alkaline earth metals?
(e) Explain why lithium compounds are more covalent than potassium compounds.
Ans. Refer to Chapter-3, Q.No.-10 (d)
(f) Why does exist as a polymer?
Ans. Refer to Chapter-4, Q.No.-1(xiv) CLICK HERE FULL ANSWER
(g) In Group 13 elements, why is the atomic size of gallium smaller than expected?
Q 3. Answer any five parts of the following:
(a) Explain with the help of MO theory, why the bond length of NO+ is shorter than that of NO.
(b) Explain the chemistry behind “acid rain”.
(c) What is the expected structure of on the basis of Valence Bond theory?
(d) Give the reaction of with water with the help of a balanced chemical equation.
(e)Why is (aq) less stable than (aq)?
(f) Why are the compounds of and white or colourless?
(g) The atomic number of Mn is 25. Calculate the number of unpaired electrons in
(h) Do the magnetic moments of the lanthanide ions agree to their spin only values? Explain.
Q4. (a) Answer any two parts of the following:
(i) What is the trend of change in the electron affinity down the group in s- and p-block elements? In which period is this general trend violated and why?
Ans. Refer to Chapter-1, Q.No.-9(c) CLICK HERE FULL ANSWER
(ii) Give the chemical equations for the preparation of hydrogen bromide and hydrogen iodide in the laboratory.
(iii) Draw the structures of and How can you distinguish from ?
(b) Explain with the help of chemical equations why cannot be handled in glass or quartz apparatus.
Q5. (a) Write the formulae of any two of the following:
(i) Hexaamminecobalt (III) chloride
Ans. Refer to Chapter === CLICK HERE FULL ANSWER
(ii) Octaaqua-µ-dihydroxodiiron (III)
Ans. Refer to Chapter
(iii) Potassium hexachloroplatinate (IV)
Ans. Refer to Chapter ===CLICK HERE FULL ANSWER
(b) Answer any two parts of the following:
(i) How can you infer whether a four coordinated complex will be a tetrahedral or square planar?
(ii) How is the bonding between nitrogen and oxygen different from the bonding between phosphorus and oxygen?
Ans. Refer to Chapter-7, Q.No.-9
(iii) Write a short note on Zone Refining or Roasting.
Ans. Refer to Chapter-13, Q.No.-3 CLICK HERE FULL ANSWER