MCQ
When fluoride is heated with conc. ${H_2}S{O_4}$ and $Mn{O_2}$ the gas evolved is
- A${F_2}$
- B$SF$
- ✓$HF$
- DNone
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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 :
$n = 4$______________
$n = 3$______________
$n = 2$ _____________
$n = 1$______________