Question

What are the possible changes in a chemical reaction?

• A. Evolution of gas
• B. Change in Colour
• C. Formation of Precipitate
• D. A new element is formed

Answer 1

Answer: (A), (B), (C)

The correct options are
A

Evolution of gas

B

Change in Colour

C

Formation of Precipitate

Chemical reactions could evolve a gas, the colour could change and precipitates could be formed.

The products could be in a different state from the reactants too.

The identity of an element depends on the number of protons in it. In a chemical reactions, electrons are transferered or shared. A new element cannot be formed in a chemical reaction.