Acid Bases and Salts Class 7 MCQ. We covered all the Acid Bases and Salts Class 7 MCQ in this post for free so that you can practice well for the exam.
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MCQ on Acid Bases and Salts for Class 7 Students
Sodium hydroxide is used
(a) as an antacid
(b) in the manufacture of soap
(c) as a cleansing agent
(d) in alkaline batteries
Option b – in the manufacture of soap
Sodium hydroxide turns phenolphthalein solution
(a) pink
(b) yellow
(c) colourless
(d) orange
Option a – pink
The chemical formula of washing soda is
(a) Na₂CO3 7H₂O
(b) Na2 CO3 5H₂O
(c) Na₂CO3 2H₂O
(d) Na₂CO3 10H₂O
Option d – Na₂CO3 10H₂O
How many water molecules does hydrated calcium sulphate contain?
(a) 5
(b) 10
(c) 7
(d) 2
Option d – 2
Sodium carbonate is a basic salt because it is a salt of an
(a) strong acid and strong base
Alkalis are
(a) acids, which are soluble in water
(b) acids, which are insoluble in water
(c) bases, which are insoluble in water
(d) bases, which are soluble in water
Option d – bases, which are soluble in water
Which of the following statements is correct about an aqueous solution of an acid and of 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
(a) (i) and (iii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (ii) and (iv)
Option d – (ii) and (iv)
The apparatus given in the adjoining figure was set up to demonstrate electrical conductivity. Which of the following statement(s) is (are) correct? (i) Bulb will not glow because the electrolyte is not acidic. (ii) Bulb will glow because HCl is a strong acid and furnishes ions for conduction. (iii) Bulb will not glow because the circuit is incomplete. (iv) Bulb will not glow because it depends upon the type of electrolytic solution.
(a) (i) and (iii)
(b) (ii) and (iv)
(c) (ii) only
(d) (iv) only
Option c – (ii) only
Lime water reacts with chlorine to give
(a) bleaching powder
(b) baking powder
(c) baking soda
(d) washing soda
Option c – baking soda
Nettle sting is a natural source of which acid?
(a) MetiWanoic acid
(b) Lactic acid
(c) Citric acid
(d) Tartaric acid
Option a – MetiWanoic acid
Tooth enamel is made up of
(a) calcium phosphate
(b) calcium carbonate
(c) calcium oxide
(d) potassium
Option a – calcium phosphate
What is the pH range of our body?
(a) 7.0 – 7.8
(b) 7.2 – 8.0
(c) 7.0 – 8.4
(d) 7.2 – 8.4
Option a – 7.0 – 7.8
Rain is called acid rain when its :
(a) pH falls below 7
(b) pH falls below 6
(c) pH falls below 5.6
(d) pH is above 7
Option c – pH falls below 5.6
Sodium hydroxide is a
(a) weak base
(b) weak acid
(c) strong base
(d) strong acid
Option c – strong base
An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?
(a) Baking powder
(b) Lime
(c) Ammonium hydroxide solution
(d) Hydrochloric acid
Option d – Hydrochloric acid
When copper oxide and dilute hydrochloric acid react, colour changes to
(a) white
(b) bluish-green
(c) blue-black
(d) black
Option b – bluish-green
At what temperature is gypsum heated to form Plaster of Paris?
(a) 90°C
(b) 100°C
(c) 110°C
(d) 120°C
Option b – 100°C
Na2CO3 10H₂O is
(a) washing soda
(b) baking soda
(c) bleaching powder
(d) tartaric acid
Option a – washing soda
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