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Hello! Shankar Kumar B.Tech -Electronics&Telecommunication Cleared 2017 ESE written & Two times GATE Qualified. 4 Years of teaching experience
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Q.1 Consider the following assumptions made while developing the ionic packing theory: 1. Cations and anions are spherical but these spheres are not harod 2. Cations are always smaller than anions 3. Each cation would tend to be surrounded by the maximum number of anions permitted by geometry 4. Cations and anions do not touch each other Which of the above assumptions are correct? (a) 1 and 3 (c) 2 and 4 (b) 1 and 4 (d) 2 and 3 [ESE: 2017] Ans. (d) For stable structuer in ionic material (like ceramics) Cations and anions are assumed hard sphere ions so statement 1 is wrong Cations and anions must touch each other so statement 4 is wrong Q.2 Consider the following statements: 1. Baking soda is used in fire extinguishers 2. Quick lime is used in the manufacture of glass Which of the above statements is/are correct? (a) 1 only (c) Both 1 and 2 (b) (d) 2 only Neither 1 nor 2 [ESE 2017] Ans. (c) Both statements are correct
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