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NCERT 7th Class (CBSE) Science: Chemical and Chemical Changes

10 Class Science Periodic Test I B (2018-19)

10 Class Science Periodic Test I B (2018-19)

School Name: Prince Public School, Pocket-6, Sector-24, Rohini, Delhi 110085 India
Class: X
M.M: 20
Time: 35 min

General Instructions:

  1. This question paper consists of 9 questions in all. All questions are compulsory
  2. Answer the questions after carefully reading the text
  3. Q.No. 1 carry 1 mark
  4. Q.No. 2-6 carries 2 marks each
  5. Q.No. 7-9 carries 3 marks each

Question: 1. What happens when Silver Chloride is exposed to sunlight? Write chemical equation for this reaction.

Question: 2. What is the difference between thermal and thermite reactions? Write equations for these reactions.

Question: 3. What is chemical reaction? Illustrate its properties.

Question: 4. What is an redox equation? Is it exothermic or endothermic? Give one example of redox reaction.

Question: 5. Balance the following chemical reactions.

  1. NH4NO2 → N+ H2O
  2. SO2 + H2S → H2O + S

Question: 6. What happens when

  1. Zink Oxide reacts with Carbon.
  2. Lead Sulphide reacts with Hydrogen per Oxide.

Question: 7. What is observed when the solution of barium chloride is added to potassium nitrate solution? What type of reaction is this? Write a balanced chemical equation for this reaction.

Question: 8. What is rancidity? Explain why, food products containing fats and oil are packed in nitrogen.

Question: 9. In the refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal. Write down the chemical equation of the reaction involved.

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