Question

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Answer 1

Answer:

2nd question assertion true reason false

Explanation:

3 re question both A and R are true I guess

Answer 2

1)Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Explanation:-According to the law of conservation of mass, matter can neither be created nor destroyed, so the total quantity of matter, i.e., the total mass, before and after a change, remains the same. So, the mass of the substances, taken together, before and after a chemical change, will also remain same. From this, it can be concluded that any new substance formed during a chemical change is due to the rearrangement of the atoms of the original substance. The number of atoms of each kind remains the same, before and after the chemical change.

2) calcium oxide and carbon dioxide.

Explanation:-In presence of heat, calcium carbonate gets decomposes into calcium oxide and carbon dioxide.

Reaction:

CaCO

3

Δ

CaO+

CO