Which of these minerals is used in hardening of steel?
(1) Cooking coal
(2) Lime stone
(3) Manganese
(4) Mica
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Which of these minerals is used in hardening of steel?
(1) Cooking coal
(2) Lime stone
(3) Manganese
(4) Mica
Which of these minerals is used in hardening of steel?
(1) Cooking coal
(2) Lime stone
(3) Manganese
(4) Mica
(3) Manganese