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Practice each question, then open the answer or worked solution.
Common salt besides being used in the kitchen can also be used as the raw material for making:
(a) (i) and (ii)
(b) (i), (ii) and (iv)
(c) (i) and (iii)
(d) (i), (iii) and (iv)
The answer is (a) (i) and (ii)
One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is
The answer is (b) tartaric acid
Explanation:
A mild edible acid along with Sodium Hydrogen Carbonate is used to prepare baking powder. Here, acetic acid or citric acid can also be used in place of tartaric acid.
To protect tooth decay we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is
The answer is c) Basic
Explanation:
Teeth will be acidic in nature because of bacterial activity in the mouth. To neutralize the acid, toothpaste will be neutral in nature.
Which of the following statements is correct about an aqueous solution of an acid and of a base?
(a) (i) and (iii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (ii) and (iv)
The answer is (d) (ii) and (iv)
Explanation:
On a PH scale acids are those whose PH is below 7 lower is the PH stronger will be acid and similarly Bases are those whose PH is more than 7. Higher is the PH strong will be acid.
The pH of the gastric juices released during digestion is
The answer is (a) less than 7
Explanation:
The PH is acidic to below 7 to ensure an easy breakdown of food particles. PH of stomach juices is usually 3.
Which of the following phenomena occur, when a small amount of acid is added to water?
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (ii) and (iv)
The answer is (b) (i) and (iii)
Which one of the following can be used as an acid-base indicator by a visually impaired student?
The answer is (c) Vanilla essence
Explanation:
Vanilla essence can be used as an olfactory indicator hence it can be used as an acid-base indicator by visually impaired students.
Which of the following substance will not give carbon dioxide on treatment with dilute acid?
The answer is (d) Lime
Explanation:
Marble, Limestone and baking soda have carbonates which produces CO2 gas. Lime contains Hydroxide which will not produce CO2.
Which of the following is acidic?
The answer is (a) Lime juice
Explanation:
Lime juice has citric acid in it. Hence it is acidic in nature.
In an attempt to demonstrate electrical conductivity through an electrolyte, the following apparatus
(Figure 2.1) was set up. Which among the following statement(s) is(are) correct?
The answer is (c) (ii) only