Class X: Important Questions (Previous years board exams questions)

Chapter 1: Chemical Reaction and Equations
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Very short answer type questions:
1. Balance the chemical equation:
NaOH + H₂SO₄ ---> Na₂SO₄ + H₂O
Ans: 2NaOH + H₂SO₄ ---> Na₂SO₄ + 2H₂O 

2. What is chemical formula of Rust?
Ans: Fe₂O₃.xH₂O  

3.  Write chemical formula of quick lime?
Ans: CaO

4. What is the chemical name of Lime?
Ans. Calcium Oxide

5. In the refining of silver, the recovery of silver from silver nitrate solution involves displacement by copper metal. Write down the reactions involved.
Ans. When copper is mixed in silver nitrate solution, it displaces the silver because copper is more reactive than silver.
2AgNO₃ + Cu ---> Cu(NO₃)₂ + 2Ag



Further only questions are given. Students can comment for answers if they want to.

6. Give an example of a double displacement reaction.
7. Write chemical equation representing reaction between lime and water.
8. What happens when limestone is heated vigorously?
9. Identify the substances that are oxidized and the substances that are reduced in the following reactions:
4Na(s) + O₂ ---> 2Na₂O(s) and CuO(s) + H₂(g) ---> Cu(s)H₂O(l)

Chapter 2: Acids, Bases and Salts
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Chapter 6: Life Processes
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Chapter 12: Electricity
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Solved board question papers:
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