Reduction of $7.2 \, g$ of a metal oxide yields $6.4 \, g$ of the metal. If the atomic mass of the metal is $128 \, g/mol$,the formula of the oxide is .....

  • A
    $MO_2$
  • B
    $M_2O_4$
  • C
    $MO$
  • D
    $M_3O_4$

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