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Which of the following is not a property of cobalt?

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Which of the following is not a property of cobalt?

(a) Cobalt is a lustrous white metal

(b) It is attacked by alkalies

(c) Cobalt is malleable

(d) Cobalt is ductile

I have been asked this question in an online quiz.

My question is based upon Non-Ferrous Metals and Alloys topic in division Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials

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Right option is (b) It is attacked by alkalies

The best explanation: Cobalt is a lustrous white metal which is not attacked by alkalies. Cobalt is ductile and malleable. The specific gravity of cobalt is 8.8.

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