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Which of the following does not contain zinc?

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in Construction & Building Materials by (190k points)
Which of the following does not contain zinc?

(a) Speculum metal

(b) Gunmetal

(c) Delta metal

(d) Muntz metal

The question was asked during an online interview.

Enquiry is from Non-Ferrous Metals and Alloys topic in portion Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials

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Best answer
Right answer is (a) Speculum metal

Easy explanation: Delta metal and Muntz metal are the common varieties of brass which contain zinc. Gunmetal is a variety of bronze but forms an exception to their general rule and contains 2-4 % of zinc. Speculum metal does not contain zinc.

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