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Aluminium metal becomes passive in :

$\begin {array} {1 1} (1)\;conc.HNO_3 & \quad (2)\;dil.H_2SO_4 \\ (3)\;very\: dil.HNO_3 & \quad (4)\;conc.H_2SO_4 \end {array}$

1 Answer

very dil HNO3
answered Nov 8, 2016 by ragulravi1999
 
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