Duralimin has composition as $A l = 95 %, C u = 4 %, M n = 0.5 %, M g = 0.5 %$ .

True

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False

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Solution

The correct option is A True
In addition to aluminium, the main materials in duralumin are copper, manganese and magnesium. Duralumin is 95% aluminium ( $A l$ ), 4% copper ( $C u$ ), 0.5% magnesium ( $M g$ ), and 0.5% manganese ( $M n$ )
Option A is correct

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γ

K M n O_{4}

C u_{2} S

K M n O_{4} + C u_{2} S \to M n^{2 +} + C u^{2 +} + S O_{2}

E_{M g^{2 +} / M g}^{0} = - 2.4 V, E_{S n^{4 +} / S n^{2 +}}^{0} = 0.1 V, E_{M n O_{4}^{-}, H^{+} / M n^{2 +}}^{0} = 1.5 V, E_{I_{2} / I^{-}}^{0} = 0.5 V

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