A hypothetical gaseous element having mo...

A hypothetical gaseous element having molecular formula `M_x` at 310 K.In this act volume of the gas is contracted from 12 ml to a volume of 8 ml.The simplest possible molecular formula of the two allotropes is :

`M_5 and M_3`

`M_3 and M_5`

`M_1 and M_2`

`M_2 and M_3`

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