CBSE Class 10 Science Acids Bases and Salts MCQs Set 05

Question: Which one is suitable method to find the accurate pH value?
a) pH meter
b) pH paper
c) Universal indicator
d) Litmus solution
Answer: c

Question: Which of the following substances will not give carbon dioxide on treatment with dilute acid?
a) Marble
b) Limestone
c) Baking soda
d) Lime
Answer: d

Question: Calcium phosphate is present in tooth enamel. Its nature is:
a) Basic
b) Acidic
c) Neutral
d) Amphoteric
Answer: a

Question: Solid sodium bicarbonate was placed on a strip of pH paper. The color of the strip
a) turned red
b) did not change
c) turned green and slightly yellow
d) turned pink
Answer: b

Question: On electrolysis of brine solution, the products formed are
a) sodium and chlorine
b) hydrogen, chlorine and oxygen
c) hydrogen, chlorine and sodium hydroxide
d) sodium hydroxide, chlorine and oxygen
Answer: c

Question: Bleaching powder gives smell of chlorine because it -
a) is unstable
b) gives chlorine on exposure to atmosphere
c) is a mixture of chlorine and slaked lime
d) contains excess of chlorine
Answer: b

Question: Why is universal indicator a better one than litmus paper?
a) Litmus paper can only be used for acids.
b) Litmus paper can only be used for alkalis.
c) Universal indicator goes green if something is neutral.
d) Universal indicator is useful for all ranges of pH of the solution.
Answer: d

Question: The colour of neutral litmus solution is
a) Red
b) Blue
c) Purple
d) Yellow
Answer: c

Question: Which of the following salts has the minimum pH value?
a) (NH₄)₂SO₄
b) NaHCO₃
c) K₂SO₄
d) NaCl
Answer: a

Question: The equation between an acid and a base is XOH + HY →XY + H₂O Which of the following is the cation part of salt ? 
a) X
b) OH
c) H
d) Y
Answer: a

Question: When a drop of unknown solution X is placed on a strip of pH paper, a deep red colour is produced. This sample is which one of these?
a) NaOH
b) HCl
c) Water
d) CH₃COOH
Answer: b

Question: A student tests a sample drinking water and reports its pH value as 6 at room temperature. Which one of the following might have been added in water?
a) Calcium chloride
b) Sodium chloride
c) Sodium bicarbonate
d) Bleaching powder
Answer: a

Question: What are the products obtained when potassium sulphate reacts with barium iodide in an aqueous medium?
a) KI and BaSO₄
b) KI, Ba and SO₂
c) K, I2 and BaSO₄
d) K, Ba, I2 and SO₂
Answer: a

Question: A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains
a) NaCl
b) HCl
c) LiCl
d) KCl
Answer: b

Question: The acid used in making of vinegar is
a) formic acid
b) acetic acid
c) sulphuric acid
d) nitric acid
Answer: b

Question: Which one of the following can be used as an acid-base indicator by a visually impaired student?
a) Litmus
b) Turmeric
c) Vanilla essence
d) Petunia leaves
Answer: a

Question: You are given four unknown solutions I, II, III, and IV. The pH values of these solutions are found to be 3, 7, 8, and 10 respectively. Among the given solutions, which solution has the highest hydrogen ion concentration?
a) I
b) II
c) III
d) IV
Answer: a

Question: Which acids are highly corrosive in nature?
a) Acetic acid and oxalic acid
b) Acetic acid and sulphuric acid
c) Sulphuric acid and nitric acid
d) Carbonic acid and acetic acid
Answer: c

Question: Four drops of red litmus solution were added to each of the following samples. Which one turns red litmus blue?
a) Alcohol
b) Distilled water
c) Sodium hydroxide sol
d) HCl
Answer: c

Question: The pH of which of the following samples cannot be found directly using pH paper?
a) Lemon juice
b) Dilute HCl
c) Solid sodium bicarbonate
d) Solution of a detergent.
Answer: c

Question: To relieve pain caused due to acidity, we can take
a) sour milk
b) lemon juice
c) orange juice
d) milk of magnesia
Answer: d

Question: Which of the following salts is basic in nature?
a) NH4NO₃
b) Na₂CO₃
c) Na₂SO₄
d) NaCl
Answer: b

Question: Which one of the following is required to identify the gas evolved when dilute hydrochloric acid reacts with zinc metal?
a) blue litmus paper
b) red litmus paper
c) a burning splinter
d) lime water
Answer: c

Question: Zinc reacts with an acid as well as with a base to liberate hydrogen. On the basis of this what should be the nature of the zinc metal?
a) Basic
b) Acidic
c) Amphoteric
d) Neutral
Answer: c

Question: Which of the following indicators is an olfactory indicator?
a) Litmus
b) Vanilla
c) Turmeric
d) Phenolphthalein
Answer: b

Question: Slaked lime is prepared by adding water to
a) bleaching powder
b) lime water
c) milk of lime
d) quicklime
Answer: d

Question: Acetic acid was added to a solid X kept in a test tube. A colourless and odourless gas was evolved. The gas was passed through lime water which turned milky. It was concluded that
a) solid X is sodium hydroxide and the gas evolved is CO₂
b) solid X is sodium bicarbonate and the gas evolved is CO₂
c) solid X is sodium acetate and the gas evolved is CO₂
d) solid X is sodium chloride and the gas evolved is CO₂
Answer: b

Question: Which of the following is the weakest base ?
a) NaOH
b) Ca(OH)₂
c) NH4OH
d) KOH
Answer: c

Question: When you test the solutions of sodium bicarbonate, sodium hydroxide, hydrochloric acid and acetic acid with universal indicator, in which case would you get a red colour?
a) Sodium bicarbonate
b) Hydrochloric acid
c) Sodium hydroxide
d) Acetic acid
Answer: b

Question: Which of the following phenomena occur, when a small amount of acid is added to water? 
(i) Ionisation
(ii) Neutralisation
(iii) Dilution
(iv) Salt formation
a) (i) and (ii)
b) (i) and (iii)
c) (ii) and (iii)
d) (ii) and (iv)
Answer: b

Question: Which of the following properties are shown by dilute HCl?
(i) It turns blue litmus red
(ii) It turns red litmus blue
(iii) It reacts with zinc and a gas is evolved
(iv) It reacts with solid sodium carbonate to give brisk effervescence
a) 1 and 2
b) 1 and 3
c) 1, 3 and 4
d) 2, 3 and 4
Answer: b

Question: 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
a) (i) and (ii)
b) (i), (ii) and (iv)
c) (i) and (iii)
d) (i), (iii) and (iv)
Answer: c