1. Water is known as the universal solvent.   True   False   2. Objects appear to weigh less in water than air.   True   False   3. Hardness of water is caused by the presence of certain salts in it.   True   False   4. Water which is absolutely pure and free from any impurity is known as   Distilled Water   Mineral Water   Spring Water   Boiled Water   Hint Half-n-half Clue   5. It is easy to make lather with hard water.   True   False   6. What is formed when hydrogen burns in oxygen?   Water   Carbon Dioxide   Hydrogen Peroxide   Carbon Monoxide   Half-n-half Clue   7. Water in solid form is known as   Ice   Soda   Crystal   Dry Ice   Half-n-half Clue