Question

27. (a) Define a combination reaction.
(b) Give one example of a combination reaction which is also exothermic.
(c) Give one example of a combination reaction which is also endothermic.
28. (a) Give an example of an oxidation reaction.
(b) Is oxidation an exothermic or an endothermic reaction ?
(C) Explain, by giving an example, how oxidation and reduction proceed side by side.
29. (a) What is the colour of ferrous sulphate crystals? How does this colour change after
(b) Name the product formed on strongly heating ferrous sulphate crystals. What type
occurs in this change?
30. What is a decomposition reaction ? Give an example of a decomposition reaction. De
illustrate such a reaction by heating.
31. Zinc oxide reacts with carbon, on heating, to form zinc metal and carbon monoxide. Write
equation for this reaction. Name (i) oxidising agent, and (ii) reducing agent, in this rea
32. Give one example of an oxidation-reduction reaction which is also :
(a) a combination reaction
(b) a displacement reaction
33. (a) What is the difference between displacement and double displacement reactions ?
these reactions.
(b) What do you mean by a precipitation reaction ? Explain giving an example.
4. (a) Explain the following in terms of gain or loss of oxygen with one example each:
(i) oxidation (ii) reduction
(b) When copper powder is heated strongly in air, it forms copper oxide. Write a balanc
for this reaction. Name (1) substance oxidised, and (ii) substance reduced.
5. (a) Define the following in terms of gain or loss of hydrogen with one example each:
(17) reduction​

Answer 1

Explanation:

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A combination reaction is a reaction where two or more elements or compounds combine to form a single compound. Such reactions are represented by equations of the following form: X + Y → XY. The combination of two or more elements to form one compound is called combination reaction

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Answer 2

A combination reaction is a reaction where two or more elements or compounds combine to form a single compound. Such reactions are represented by equations of the following form: X + Y → XY. The combination of two or more elements to form one compound is called combination reaction.

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