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Class 10
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Properties of Acids and Bases
Properties of Acids and Bases
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1)
pH of a solution is 8.3. Then the solution is:
Less acidic
Basic
Neutral
More acidic
2)
Why do Na₂CO₃ and NaOH not react?
Both are alkali
Both are acid
Na₂CO₃ is an acid & NaOH is a base
Both are neutral
3)
When CO₂ gas is passed through lime water, it turns milky. This is due to the formation of:
Ca(OH)₂
CaCO₃
CaO
CaSO₄
4)
Take a test tube containing zinc metal and add a little amount of dil. HCl into it. Evolution of gas bubbles occurs. The gas evolved is:
H₂
O₂
N₂
Cl₂
5)
What is the acid-base indicator which gives a pink color in an alkaline medium?
methyl orange
phenol red
phenolphthalein
methyl red
6)
The hydrogen ion concentration of a solution is 0.001moles/liter. What is the pH of the solution?
0.001
1
3
11
7)
While performing an activity in the lab students poured phenolphthalein indicator to four different solutions taken in four different test tubes. A pink colour is observed in test tube.
8)
The picture given below shows the reaction of Zn with sodium hydroxide solution. The gas produced during the reaction extinguishes the burning candle and burns with mild explosion producing a pop sound. The gas evolved during the reaction is:
Oxygen
Hydrogen
Carbon monoxide
Carbon dioxide
9)
Which one of the following is required to identify the gas evolved when dil. HCl reacts with zinc metal?
Blue litmus paper
Red litmus paper
Lime water
A burning splinter
10)
Which one of the following is observed when solid sodium carbonate is added to dilute hydrochloric acid?
No change takes place
A loud sound is produced
Brisk effervescence occurs
The solution turns blue