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Q.

'Mischmetal' alloy does not contain :

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a

lanthanoid metal (-95%)

b

iron (-5 %)

c

S, C, Ca and Al traces

d

Mg traces

answer is D.

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Detailed Solution

Mischmetal is a mixture of iron, rare earth elements, and small amounts of S, C, Ca, and Al. The ratio of cerium to lanthanum is 50% to 25%, with trace levels of neodymium and praseodymium. It makes steel more workable. It is a component of the ferrocerium "flint" ignition system found in numerous lighters and torches.

Mischmetal alloy does not contain Mg traces.

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