No,we cannot store lemon pickle in an aluminium utensil because lemon is acidic in nature and when aluminium comes in contact with lemon, which is acidic, produce hydrogen and hence the lemon pickle will be spoiled.As well as the lemon which is acidic will make holes in the aluminium utensil.

Since lemon pickle is fundamentally an acid & aluminum is a metal and as we know, metals react with acids to produce hydrogen gas. So, it is not advisable to store lemon pickle in an aluminum utensil because it will spoil the lemon pickle and holes will be formed in the vessel. Hence, what you have written is absolutely right. Hope this helps you! :)