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Class 10 Science Chapter 4: Carbon and its Compounds Assertion-reason questions with answers

2 assertion-reason questions on Carbon and its Compounds, each with its answer and the reason, written from the NCERT chapter. Open a question's solution to check your working; then take the free test to find your next chapter. Each question gives an Assertion (A) and a Reason (R); choose how they stand to each other.

Question 1
Assertion (A): A solution of soap in water looks cloudy. Reason (R): Soap micelles are large enough to scatter light.
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Answer: (a) Both A and R are true, and R is the correct explanation of A.

Both are true, and the cloudiness is caused by the micelles scattering light, so R explains A.

Question 2
Assertion (A): Both diamond and graphite burn in oxygen to give carbon dioxide. Reason (R): Graphite is a very good conductor of electricity.
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Answer: (b) Both A and R are true, but R is not the correct explanation of A.

Carbon in all its allotropic forms burns in oxygen to give CO₂, so A is true; graphite does conduct, so R is true. Conductivity has nothing to do with burning, so R does not explain A.

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