How is the impurity of iron present in several substances removed in industries?
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In industries, the impurity of iron present in several substances is removed by the use of magnets. Iron objects stick to the magnet leaving behind other objects.
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What is meant by (i) homogeneous mixtures, and (ii) heterogeneous mixtures? Give two examples of homogeneous mixtures and two of heterogeneous mixtures.
Classify the following into metals, non-metals and metalloids: Silicon, Mercury, Diamond, Sulphur, Iodine, Germanium, Sodium, Carbon, Magnesium, Copper, Boron, Helium.
Differentiate between physical and chemical change. Give one example of each. Give one example where both physical and chemical change is taking place.
A solution of alcohol in water has been prepared by mixing $150\ mL$ of alcohol with $600\ mL$ of water. Calculate the volume percentage of the solution.