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- 1. Fill in the Blank
________ of electrons is oxidation.
- 2. Multiple Choice
Electrolysis of water is a decomposition reaction. The molar ratio of hydrogen and oxygen gases liberated during electrolysis of water is:
1:1
2:1
1:2
4:1
- 3. Multiple Choice
What is observed when a solution of potassium iodide is added to silver nitrate solution?
No reaction takes place
White precipitate of silver iodide is formed
Yellow precipitate of AgI is formed
AgI is soluble in water
- 4. Fill in the Blank
The oxidizing agent in the following reaction is _________
CuO + H2 -->Cu + H2O
- 5. Multiple Choice
Rusting of iron is a physical change.
True
False
- 6. Multiple Choice
CaO + H2O --> Ca(OH)2
This is an example of
Combination reaction
Decomposition reaction
Displacement reaction
None of the above
- 7. Fill in the Blank
The process of wasting away of metals on exposure to moist air is called ____________.
- 8. Multiple Choice
Assertion: AgBr is used on photographic and X – ray film.
Reason: AgBr is photosensitive and changes to Ag and bromine in presence of sunlight and undergoes decomposition reaction.
Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
Assertion is true but the reason is false.
The statement of the Assertion is false but the Reason is true.
- 9. Multiple Choice
Assertion: Zinc reacts with sulphuric acid to form zinc sulphate and hydrogen gas and it is a displacement reaction.
Reason: Zinc reacts with oxygen to form zinc oxide.
Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
Assertion is true but the reason is false.
The statement of the Assertion is false but the Reason is true.
- 10. Fill in the Blank
Corrosion of iron is known as ________________.
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