Among the following which is an example of chemical change? (a) Glowing of an electric light (b) Dropping sodium into water (c) Dissolving of salt in water (d) Formation of clouds
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Answer:
opt b)Dropping sodium into water
Explanation:
Dropping Sodium into water is a chemical change as it produces heat and light. And a new substance is also formed.
We get caustic soda from it
Caustic soda is NaOH or sodium hydroxide
it sets itself on fire!
the other changes are not chemical but physical
glowing of light bulb is also physical as no new substance is formed.
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Answer:
B) Dropping of sodium into water
Explanation:
Water changes it colour which is a chemical change
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