The alkali metals have relatively low melting point. Which one of the following alkali metals is expected to have the highest melting point?

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Q: 67 (NDA-II/2015)
The alkali metals have relatively low melting point.
Which one of the following alkali metals is expected to have the highest melting point?
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question_subject: 

Geography

question_exam: 

NDA-II

stats: 

0,11,13,11,4,1,8

keywords: 

{'alkali metals': [0, 0, 1, 2], 'highest melting point': [0, 0, 0, 1], 'low melting point': [0, 1, 1, 3], 'na': [0, 0, 2, 2]}