Which of the following statements about magnetite ore of iron is/are c

1.	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 3
Answer» Correct option (c) 1 and 3 only Explanation: Percentage Fe in magnetite Fe₃O₄ is 168/(168 + 64)=72.4%. So, statement 2 is incorrect. It is the most magnetic of all the naturally-occurring minerals on Earth. So, statement 3 is correct. Magnetite is black or brownish-black with a metallic lustre. So statement 1 is correct.

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 3

Answer»

Correct option (c) 1 and 3 only

Explanation:

Percentage Fe in magnetite Fe₃O₄ is 168/(168 + 64)=72.4%. So, statement 2 is incorrect.

It is the most magnetic of all the naturally-occurring minerals on Earth.

So, statement 3 is correct.

Magnetite is black or brownish-black with a metallic lustre. So statement 1 is correct.

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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 3

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