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Answer:
i. manganese dioxide is used as catalyst.
ii.The potassium chlorate is heated and oxygen is evolved leaving KCl. CHEMICAL EQUATION 2KClO3(s) 2KCl(s) + 3O2(g)
iii. downward displacement of water
iv. Oxygen is collected by the downward displacement of water because it is only slightly soluble in water and is less dense than water. It cannot be collected by downward displacement of air since oxygen is slightly heavier than air and also it will get mixed with other gases in the air.
v. when an electric current is passed through acidified water , the water ionizes and splits into oxygen and hydrogen atoms.
vi. required for breathing
required for formation of water along with hydrogen
Explanation:
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