MCQ
Which of the following has largest ionic radius
- ✓$C{s^ + }$
- B$L{i^ + }$
- C$N{a^ + }$
- D${K^ + }$
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Statement $I:$ Upon heating a borax bead dipped in cupric sulphate in a luminous flame, the colour of the bead becomes green.
Statement $II:$ The green colour observed is due to the formation of copper(I) metaborate.
In the light of the above statements, choose the most appropriate answer from the options given below :