Which metal in aluminium alloy reacts with water to give out hydrogen filled pinholes?(a) Manganese(b) Iron(c) Magnesium(d) AluminiumI have been asked this question by my school teacher while I was bunking the class.My enquiry is from Mold-Metal Reaction in chapter Mold and Mold Making of Casting-Forming-Welding I

Which metal in aluminium alloy reacts with water to give out hydrogen

1.	Which metal in aluminium alloy reacts with water to give out hydrogen filled pinholes?(a) Manganese(b) Iron(c) Magnesium(d) AluminiumI have been asked this question by my school teacher while I was bunking the class.My enquiry is from Mold-Metal Reaction in chapter Mold and Mold Making of Casting-Forming-Welding I
Answer» Correct ANSWER is (c) Magnesium The explanation is: Magnesium which is PRESENT in small quantity INSIDE the light alloy, when REACTS with WATER, causes the formation of hydrogen filled pinholes.

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