Question

I. Answer the following:

1. Identify the type of each of the following reactions:
a. A reaction in which a single product is formed from two or more reactants.
b. The reaction mixture becomes warm.
c. An insoluble substance is formed.
d. External surface of the container in which reaction takes place becomes cold. [CBSE 2012]

2. A solution of potassium chloride when mixed with silver nitrate solution, an insoluble white substance is formed. Write the chemical reaction involved and also mention the type of reaction.
Ans : [CBSE 2012, 2011, 2010]

3. Decomposition reactions require energy either in the form of heat, light or electricity for breaking down the reactants. Write an equation each for decomposition reactions where energy is supplied in the form of heat, light and electricity. [CBSE 2018, 2014]

4. In the electrolysis of water:
a. Name the gas collected at the cathode and anode respectively.
b. Why is volume of gas collected at one electrode double than that at the other? Name this gas.
c. How will you test this gas? [CBSE 2012, CBSE Sample Paper 2018]

5. In a schematic diagram for the preparation of hydrogen gas as shown in the figure. What would happen if the following changes are made?
a. In place of zinc granules, same amount of zinc dust is taken in the test tube?
b. Instead of dilute sulphuric, dilute hydrochloric acid is taken?
c. Sodium hydroxide is taken in place of dilute sulphuric acid and the flask is heated? [CBSE2014,2010]
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Answer 1

Answer:

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