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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
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
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.