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Combination Reaction
Combination Reaction
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1)
On passing CO₂ gas through the product formed by the reaction between CaO and H₂O, solution becomes which colour?
Red
Pink
Black
White
2)
CaO is commonly known as __________.
Lime water
Slaked lime
Quick lime
Lemon water
3)
Which of the following behaviours is true about the solution obtained by mixing CaO with water?
Basic solution
Acidic solution
Neutral solution
Amphoteric solution
4)
Which of the following information about the reaction of CaO with water is not true?
CaO reacts with water vigorously.
During the reaction the test tube becomes hot.
CaO reacts with water to form slaked lime.
During the reaction the test tube becomes cold.
5)
Which of the following represents a combination reaction?
Reaction of zinc metal with copper sulphate solution.
Heating of lead nitrate.
Reaction between silver nitrate and sodium chloride.
Burning of magnesium in air.
6)
Which one of the following is a combination reaction?
Liquefaction of air
Electrolysis of water
Combustion of hydrogen
Freezing of water
7)
While performing an activity in the lab, Meera exhaled air into a colourless solution taken in a test tube. Suddenly its colour turned to milky white. Which among the following is the colourless solution?
Lime water
Soda water
Aqueous solution of NaOH
Aqueous solution of NaCl
8)
To observe the reaction between quicklime and water, do you require the mixture to be heated?
We need to heat the mixture initially, even though it is an exothermic reaction.
We do not need to heat the mixture as it is an exothermic reaction.
We need to heat the mixture as it is an exothermic reaction.
None of these.
9)
If a student takes 5ml of the clear liquid obtained after the reaction of quick lime with water in a test tube and breathes out carbon dioxide through it. What does he observe?
The clear liquid turns black.
The clear liquid turns milky.
The clear liquid turns blue.
No change occurs.
10)
What is a clear solution of slaked lime in water commonly called?
Milk of lime
Calcium hydroxide solution
Lime water
Quick lime