NDA 2017 Chemistry question

Chemistry General Principles and Processes of Isolation of Elements (Metallurgy)NDA 2017

Which of the following statements about magnetite ore of iron is/are correct ? 1. It is known as black ore. 2. It contains 60% to 70% of pure iron. 3. It possesses magnetic properties. Select the correct answer using the codes given below :

(A)1 only
(B)2 and 3 only
(C)1 and 3 only
(D)1, 2 and 3Correct

Answer: (D)

Solution

Magnetite () is the richest ore of iron. Statement 1 is correct: because of its dark colour it is called black ore. Statement 2 is correct: it contains about 60 to 70 per cent (up to 72 per

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Question ID VK-030893