SPINAL CORD AND REFLEX ACTION
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Thursday, 26 July 2012
Friday, 13 July 2012
Class X: Important Questions (Previous years board exams questions)
Chapter 1: Chemical Reaction and Equations
source|jsuniltutorial : Solved questions 1
source|jsuniltutorial : Solved questions 2
source|jsuniltutorial : Solved questions 3
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
source|jsuniltutorial : Notes
source|jsuniltutorial : Solved questions 1
source|jsuniltutorial : cbse guess questions
source|jsuniltutorial : Important questions
Chapter 6: Life Processes
source|jsuniltutorial : Important questions 1
source|jsuniltutorial : Important questions 2
Chapter 12: Electricity
source|jsuniltutorial : Important questions 1
source|jsuniltutorial : Important questions 2
source|jsuniltutorial : Important questions 3 (MCQ)
Solved board question papers:
source|www.tcyonline.com
source|jsuniltutorial : Solved questions 1
source|jsuniltutorial : Solved questions 2
source|jsuniltutorial : Solved questions 3
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
source|jsuniltutorial : Notes
source|jsuniltutorial : Solved questions 1
source|jsuniltutorial : cbse guess questions
source|jsuniltutorial : Important questions
Chapter 6: Life Processes
source|jsuniltutorial : Important questions 1
source|jsuniltutorial : Important questions 2
Chapter 12: Electricity
source|jsuniltutorial : Important questions 1
source|jsuniltutorial : Important questions 2
source|jsuniltutorial : Important questions 3 (MCQ)
Solved board question papers:
source|www.tcyonline.com
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