Match the columns: Column A Column B 1 . CO 2 (i) Lava 2 . Water purifier (ii) Quartzite 3 . Sandstone (iii) Tsunami 4 . Obsidian (iv) Fire extinguisher 5 . Earthquake (v) Ultra-violet rays

1-iv The carbon dioxide gas puts out fire because it is inflammable. So it is used in fire extinguishers. 2-v Electromagnetic radiations like ultraviolet rays obtained from the sun and are used to kill germs present in the water. 3-ii Quartzite is formed from sandstone which is a metamorphic rock. 4-i Obsidian is an igneous rock formed by the lava that cools and turns hard into solid rock. 5-iii Natural events that cause damage to life and property are called natural disasters or natural calamities. Earthquakes and tsunamis are natural calamities. Tsunamis can be caused by undersea earthquakes or volcanic eruptions. Column A Column B 1 . CO 2 (iv) Fire extinguisher 2 . Water purifier (v) Ultra-violet rays 3 . Sandstone (ii) Quartzite 4 . Obsidian (i) Lava 5 . Earthquake (iii) Tsunami

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Which gas is released from the fire extinguishers-

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C O_{2}

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Match the columns:

Column A	Column B
$1$ . ${CO}_{2}$	(i) Lava
$2$ . Water purifier	(ii) Quartzite
$3$ . Sandstone	(iii) Tsunami
$4$ . Obsidian	(iv) Fire extinguisher
$5$ . Earthquake	(v) Ultra-violet rays

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Which gas is released from the fire extinguishers-

Important Questions on Acids, Bases and Salts

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