Download Model question papers & previous years question papers

Posted Date: 06 Mar 2009      Posted By:: Seema RK    Member Level: Gold    Points: 5 (Rs. 1)

2009 CBSE Chapterwise Questions- MATHS Question paper



Course: SSLC   University/board: CBSE





Science For Class 10
Chemical Reactions and Equations


Q 1 Identify the component oxidised in the follwing reaction :
H2S + Cl2 ? S + 2HCl

Mark (1)

Q 2 Define oxidising agent.
Mark (1)

Q 3 Which of the following is a combination and which is a displacement reaction?

(a) Cl2 + 2KI ? 2KCl + I2
(b) 2K + Cl2 ? 2KCl

Mark (1)

Q 4 What is catalytic decomposition?
Mark (1)

Q 5 What are displacement reactions?
Mark (1)

Q 6 What is meant by oxidation?
Mark (1)

Q 7 What is a chemical reaction ?
Mark (1)

Q 8 Define rancidity.
Mark (1)

Q 9 What type of reaction is represented by the digestion of food in our body?
Mark (1)
View Answer
Q 10 Why does the colour of copper sulphate solution change when an iron nail is dipped in it?
Mark (1)
View Answer
Q 11 What are double displacement reactions? Give an example.
Mark (1)

Q 12 What are combination reactions?
Mark (1)

Q 13 Define the term reduction.
Mark (1)

Q 14 Define the term corrosion.
Mark (1)

Q 15 Why do we apply paint on iron articles?
Mark (1)

Q 16 Write the term used for the symbolic representation of a reaction.
Mark (1)

Q 17 In the following reaction between lead sulphide and hydrogen peroxide:
PbS(s) + 4H2O2(aq) ? PbSO4(s) + 4H2



(a) Which substance is reduced?

(b) Which substance is oxidised?

Mark (1)

Q 18 Why do we apply paint on iron articles?
Marks (2)

Q 19 Oil and fat containing food items are flushed with Nitrogen. Why?
Marks (2)

Q 20 What happens when an iron nail is dipped in copper sulphate solution?
Marks (2)

Q 21 Why should magnesium ribbon be cleaned before burning in air?
Marks (2)

Q 22 A solution of a substance ‘X’ is used for white washing.
(a) Name the substance ‘X’ and write its formula.
(b) Write the reaction of the substance ‘X’ named in (a) above with water.
Marks (2)

Q 23 What do you understand by corrosion?
Marks (3)

Q 24 Explain the oxidation in terms of gain or loss of oxygen with examples.
Marks (3)

Q 25 What is a precipitation reaction? Give example.
Marks (3)

Q 26 Write two uses of decomposition reactions.
Marks (3)

Q 27 What is the difference between combination and decomposition reaction? Give one example of each type.
Marks (3)

Q 28 Why is respiration considered an exothermic reaction? Explain.
Marks (3)

Q 29 Write the balanced equation for the following chemical reactions-
(a) Sodium + Water Sodium hydroxide + Hydrogen

(b) Barium Chloride + Aluminium Sulphate Barium Sulphate + Aluminium Chloride


(c) Hydrogen sulphide + Oxygen Water + Sulphur dioxide

Marks (3)

Q 30 What are exothermic and endothermic reactions? Give examples.
Marks (3)

Q 31 Explain the terms oxidizing and reducing agents.
Marks (5)

Q 32 What is the difference between displacement and double displacement reactions? Write example of each reaction.
Marks (5)

Q 33 What do you understand by a balanced chemical equation? Why should the chemical equation be balanced?
Marks (5)





Return to question paper search

Next Question Paper: Integrated Case Studies - I

Previous Question Paper: Chapterwise Questions- Science

Related Question Papers:


  • ICSE Guess Papers : Mathematics (Height and Distance)


  • ICSE Guess Papers : Mathematics (Similarity)


  • ICSE Guess Papers : Mathematics (Mensuration)


  • ICSE Guess Papers : Mathematics (Graphical Representation of Data)


  • ICSE Guess Paper-Mathematics


  • Categories


    Submit Previous Years University Question Papers and make money from adsense revenue sharing program

    Are you preparing for a university examination? Download model question papers and practise before you write the exam.

    Awards & Gifts
    Active Members
    TodayLast 7 Daysmore...

    ISC Technologies, Kochi - India. Copyright © All Rights Reserved.