A metal alloy is used in printing presses as a picture, number or alphabet letter-type for printing. It contains:

chromium

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lead

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oxygen

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steel

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Solution

The correct option is A lead
Antimony (Sb) melts at 630 °C. This highly crystalline metalloid gives type metal its hardness and a much better and sharper cast from the matrix. It has a crystalline appearance while being both brittle and fusible. When alloyed with lead, it strengthens the alloy and improves casting detail.
Hence option B is correct answer.

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