Option 1 states that magnetite ore of iron is known as black ore. This statement is correct. Magnetite is a black-colored iron ore.
Option 2 states that magnetite ore contains 60% to 70% of pure iron. This statement is correct. Magnetite is one of the primary sources of iron ore and typically contains a high percentage of iron.
Option 3 states that magnetite ore possesses magnetic properties. This statement is correct. Magnetite is a naturally occurring magnetic mineral and is strongly attracted to magnets.
Therefore, all three options are correct. Magnetite ore of iron is known as black ore, it contains 60% to 70% of pure iron, and it possesses magnetic properties.