Question

When iron fillings and sulfur powder are mixed together at room temperature, which one of the following statements is correct?


Options:-

They cannot be separated from each other.


A new compound called iron (II) sulfide is formed.


The sulfur may be separated from the mixture by dissolving it in water.


The iron may be separated from the mixture by using a magnet.

PLZ HELP

Answer 1

Answer:

A new compound called iron (II) sulfide is formed.

A new

Answer 2

The correct statement is (D) The iron may be separated from the mixture by using a magnet.

Given: Iron fillings and sulfur powder are mixed at room temperature.

To Find: The correct option.

Solution:

• It is said that the iron fillings and sulfur powder are mixed at room temperature, so we can say that it is a physical process.
• We know that in a physical process, the reactants or the substances involved retain their original chemical properties, and there is no new substance formed.
• A significant physical property of iron is its magnetic property. Also, the color of sulfur is yellow. So, these properties will be retained if the substances are just mixed.
• Had the mixture of iron fillings and sulfur powder been heated strongly, then they can undergo a chemical change with the formation of ferrous sulfide (FeS). It would have been a new product with properties entirely different from iron and sulfur.

Coming to the options given;

(1) They cannot be separated from each other.

This is false because they have been mixed ( which is a physical property ) hence, they can easily be separated using different methods.

(2) A new compound called iron (II) sulfide is formed.

This is false because they have not been heated, so no chemical process has been performed, hence no new substance can be formed.

(3) The sulfur may be separated from the mixture by dissolving it in water.

This is also false since sulfur is insoluble in water.

(4) The iron may be separated from the mixture by using a magnet.

This is true because as said earlier, a significant physical property of iron is its magnetic property. So, the iron filings will cling to the magnet leaving the sulfur powder behind.

Hence, the correct statement is (D) The iron may be separated from the mixture by using a magnet.

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