Which of the following compound has lowest melting point?

RbCl

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RbF

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RbI

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RbBr

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Solution

The correct option is C RbI
The melting points of the compounds are as follows :

RbCl = $718^{0}$ C

RbF = $795^{0}$ C

RbI = $642^{0}$ C

RbBr = $682^{0}$ C

Hence, RbI has lowest melting point.

Therefore, the correct option is C.

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