What is the composition of metals in pyrophoric mischmetal?
- A$Ce\, 50\%, La\, 40\%, Fe\, 10\%$
- B$Ce\, 50\%, La\, 40\%, Fe\, 7\%, \text{others } 3\%$
- C$Ce\, 40\%, La\, 50\%, Fe\, 5\%, \text{others } 5\%$
- D$Ce\, 40\%, La\, 50\%, Fe\, 10\%$
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