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In KBr, the coordination number of each ion changes from X to Y when the crystal is subjected to which condition?

1. X = 6 to Y = 8 by increasing the temperature
2. X = 8 to Y = 6 by applying high pressure
3. X = 6 to Y = 8 by applying high pressure
4. None of these

Correct answer: X = 6 to Y = 8 by applying high pressure

Solution

KBr (rock-salt, 6:6) converts to the CsCl-type 8:8 structure under high pressure (coordination 6 -> 8). The stored option attributes the change to temperature, which is wrong.

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