Q11. Define: Double Displacement Reactions.
Questions 12 to 14 carry 2 marks each-
Q12. Explain with the help of examples why, decomposition reactions are termed as oppos
combination reactions?
Q13. Write two observations for the reaction that will take place when ferrous sulphate wi
heated strongly.
Q14. What happens when water is added to quick lime?
a) Write the equation for the reaction that takes place.
b) Name the two types of reactions involved.
Question 15 carries 3 marks-
Q15. Translate the following statements into chemical equations and then balance the eq
a) Aluminum sulphate reacts with sodium hydroxide to give aluminium hydroxide an
sulphate
b) Ammonia gas reacts with oxygen gas to give nitrogen gas and water.
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Answer:
11. Double displacement reaction is a bimolcular process in which two elements are exchanged to give new products.
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