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Sodium carbonate is a basic salt, because it is a salt of:

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Important Questions on Acids, Bases and Salts

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10th CBSE
IMPORTANT
ESSENTIALS OF CHEMISTRY X>Chapter 2 - Acids, Bases and Salts>Value Based Questions>Q 64
Baking soda is one of the constituents of baking powder. The other constituent is:
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10th CBSE
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ESSENTIALS OF CHEMISTRY X>Chapter 2 - Acids, Bases and Salts>Value Based Questions>Q 65
Which of the following can be used as an acid-base indicator by a visually impaired student?
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10th CBSE
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ESSENTIALS OF CHEMISTRY X>Chapter 2 - Acids, Bases and Salts>Value Based Questions>Q 66

The following solutions were tested for their pH value by using pH paper. The solutions which would show a value of pH less than 7 would be. 
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10th CBSE
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ESSENTIALS OF CHEMISTRY X>Chapter 2 - Acids, Bases and Salts>Value Based Questions>Q 67
When a few drops of universal indicator were added to a dilute solution of HCI, it is observed that the colour of the solution changes from
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10th CBSE
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ESSENTIALS OF CHEMISTRY X>Chapter 2 - Acids, Bases and Salts>Value Based Questions>Q 68
A student was given three samples containing hydrochloric acid, sodium bicarbonate solution and water in test-tubes l, Il and III respectively. On dipping a pH paper in them, he observed that the colour turned orange in I, blue in Il, and green in Ill. If arranged in increasing order of their pH it would be :
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ESSENTIALS OF CHEMISTRY X>Chapter 2 - Acids, Bases and Salts>Value Based Questions>Q 69
Dilute hydrochloric acid is added to sodium carbonate. It is observed that:
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10th CBSE
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ESSENTIALS OF CHEMISTRY X>Chapter 2 - Acids, Bases and Salts>Value Based Questions>Q 70
On putting a few drops of a liquid on a pH strip, the colour of pH strip changed to green. The liquid is most probably.
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10th CBSE
IMPORTANT
ESSENTIALS OF CHEMISTRY X>Chapter 2 - Acids, Bases and Salts>Value Based Questions>Q 71
Which of the following chemical properties are shown by dilute hydrochloric acid? 
(i) turns blue litmus red 
(ii) turns red litmus blue 
(iii) reacts with zinc and a gas is evolved 
(iv) reacts with solid sodium carbonate to give brisk effervescence.