EASY
10th CBSE
IMPORTANT
Earn 100
A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue?
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Important Questions on Acids, Bases and Salts
EASY
10th CBSE
IMPORTANT
Which of the following gives the correct increasing order of acid strength?
EASY
10th CBSE
IMPORTANT
If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?
EASY
10th CBSE
IMPORTANT
Sodium hydrogen carbonate when added to acetic acid evolves a gas. Which of the following statements are true about the gas evolved?
(i) It turns lime water milky.
(ii) It extinguishes a burning splinter.
(iii) It dissolves in a solution of sodium hydroxide.
(iv) It has a pungent odour.
EASY
10th CBSE
IMPORTANT
Common salt besides being used in kitchen can also be used as the raw material for making
(i) washing soda
(ii) bleaching powder
(iii) baking soda
(iv) slaked lime
EASY
10th CBSE
IMPORTANT
One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is
EASY
10th CBSE
IMPORTANT
To protect tooth decay we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is
EASY
10th CBSE
IMPORTANT
Which of the following statements is correct about an aqueous solution of an acid and a base?
(i) Higher the pH, stronger the acid
(ii) Higher the pH, weaker the acid
(iii) Lower the pH, stronger the base
(iv) Lower the pH, weaker the base
EASY
10th CBSE
IMPORTANT
The pH of the gastric juices released during digestion is
