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Q. 1. Explain any seven of the following :
(i) Alkali metal salts impart a characteristic color to the flame.
(ii) The solubilities of sulphates of Group II decrease down the group.
(iii) BCI3 is monomeric whereas A1C13 is dimeric.
(iv) PbO2 is less stable than PbO.
(v) HF is a liquid whereas HCl is a gas at room temperature.
(vi) NC13 exists but NC15 does not,
(vii) Lithium carborate decomposes on heating,
(viii) Nitric oxide (NO) is paramagnetic,
(ix) Chlorine is a stronger oxidizing agent than iodine.
Answer :
Q. 2. (a) Why does lithium form normal oxides, sodium forms peroxide and potassium, rubidium form superoxides ? 2
(b) BF3 and BrF3 molecules have different structures. Explain.
(c ) Why oxygen exists as O2 and sulphur as S8 ?
Answer :
Q, 3. (a) Describe roasting. What is auto reduction ? 2
(b) Expain zone refining with diagram. 2
(c ) Explain acidic and basic flux with one example each as used in metallurgy.
Answer :
Q. 4. (a) Give a method for preparing borax from the min¬eral colemanite. Give its Four uses.
(b) Give a method of preparation of diborane. Why it is called an electron deficient compound. Discuss its structure. 3
(c ) Give the reaction of diborane with water and ammonia.
Answer :
Q. 5. Write short notes on any two of the following :
(i) Classification of silicates
(ii) Oxyacids of nitrogen
(iii) Pseudohalogens and pseudohalides.
Answer :
Q. 6. (a) What are interhalogen compounds ? How does VSEPR theory explain the structures of AX3, AX5 and AX7 types?
(b) How is hydrazine prepared by Raschig’s Method ? Give its structure.
Answer :
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