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Question
Assertion :8:8 co-ordination of CsCl at low temperature changes to 6:6 co-ordination at 760K. Reason: Temperature also influences the structure of solids.
Assertion :8:8 co-ordination of CsCl at low temperature changes to 6:6 co-ordination at 760K. Reason: Temperature also influences the structure of solids.
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Pressure and temperature also influences the structure of ionic solids. The structures of chlorides, bromides and iodides of sodium, potassium and rubidium having 6:6 co-ordination at normal temperature and pressure changes to 8:8 co-ordination like CsCl structure at high pressure. Thus, high pressure increases co-ordination number. Furthermore, CsCl structure changes to NaCl structure at 760 K. Thus, high temperature decreases the co-ordination number.
Pressure and temperature also influences the structure of ionic solids. The structures of chlorides, bromides and iodides of sodium, potassium and rubidium having 6:6 co-ordination at normal temperature and pressure changes to 8:8 co-ordination like CsCl structure at high pressure. Thus, high pressure increases co-ordination number. Furthermore, CsCl structure changes to NaCl structure at 760 K. Thus, high temperature decreases the co-ordination number.
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