Consider the following assumptions made while developing the

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ESE (IES) ECE 2017 Non Technical - 1
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Engineering aptitude

77

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Consider the following assumptions made while developing the ionic packing theory:
1. Cations and anions are spherical but these spheres are not hard
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?

[ESE (IES) ECE 2017 Non Technical - 1]

A 1 and 3

B 1 and 4

C 2 and 4

D 2 and 3