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Acid Bases and Salts Class 10 NCERT Solutions. We covered all the Acid Bases and Salts Class 10 NCERT Solutions 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 10 Students NCERT
A Base changes red litmus paper to blue, while an Acid changes blue litmus to red. If a student uses red litmus on a liquid and sees no color change, what does this indicate about the liquid?
(a) It is pure water
(b) It is acidic
(c) It is not basic
(d) It is neither acidic nor basic
Option c – It is not basic
Which of the following sequences correctly represents decreasing Acid strength?
(a) H₂SO₄ > H₃PO₃ > CH₃COOH
(b) H₃PO₃ > H₂SO₄ > CH₃COOH
(c) CH₃COOH > H₃PO₃ > H₂SO₄
(d) CH₃COOH > H₂SO₄ > H₃PO₃
Option a – H₂SO₄ > H₃PO₃ > CH₃COOH
Fresh milk typically has a pH around 6. What happens to the pH when it becomes sour?
(a) It drops below 6
(b) It remains at 6
(c) It increases above 6
(d) It becomes neutral, around 7
Option a – It drops below 6
Which of the following substances is categorized as a double Salt?
(a) K₄Fe(CN)₆
(b) K₂SO₄·Al₂(SO₄)₃·24H₂O
(c) CuSO₄·5H₂O
(d) NaCl
Option b – K₂SO₄·Al₂(SO₄)₃·24H₂O
When groundwater is exposed to air, why does its pH tend to decrease slightly?
(a) It absorbs carbon dioxide from the air
(b) It absorbs oxygen from the air
(c) Carbon dioxide escapes from the water
(d) Oxygen escapes from the water
Option a – It absorbs carbon dioxide from the air
Why is aluminium preferred in thermite welding?
(a) It is lightweight
(b) It has a strong affinity for oxygen
(c) It acts as an oxidizing agent
(d) It is highly reactive
Option b – It has a strong affinity for oxygen
Which compound is frequently used as an antacid to relieve stomach acidity?
(a) Sodium hydrogen phthalate
(b) Magnesium hydroxide
(c) Calcium hydroxide
(d) Manganese acetate
Option b – Magnesium hydroxide
In the paper production process, which chemical is used for degumming raw material?
(a) Sulphuric Acid
(b) Bleaching powder
(c) Caustic soda
(d) Nitric Acid
Option b – Bleaching powder
Why is dolomite powder added to certain agricultural soils?
(a) To increase soil pH
(b) To reduce soil pH
(c) To boost phosphorus content
(d) To enrich nitrogen levels
Option a – To increase soil pH
Which of the following Salts, when mixed with water, results in a basic solution?
(a) Sodium chloride
(b) Copper sulphate
(c) Ferric chloride
(d) Sodium acetate
Option d – Sodium acetate
Arrange these Bases by increasing basicity: 1. Sodium hydroxide 2. Magnesium hydroxide 3. Aluminium hydroxide 4. Ammonium hydroxide
(a) 4, 2, 1, 3
(b) 4, 1, 2, 3
(c) 4, 3, 2, 1
(d) 1, 2, 3, 4
Option c – 4, 3, 2, 1
Which of the following is not a typical characteristic of Salts?
(a) They have a structured lattice arrangement
(b) They possess low melting points but high boiling points
(c) They are brittle
(d) They can conduct Electricity in molten form or when dissolved in water
Option b – They possess low melting points but high boiling points
A solution of hydrochloric Acid has a concentration of 10⁻⁸ M. What would be the pH of this solution?
(a) 7
(b) Greater than 7, but not 14
(c) Less than 7
(d) 14
Option d – 14
The human stomach secretes an Acid that aids Digestion. Identify this Acid.
(a) Acetic acid
(b) Methanoic acid
(c) Hydrochloric acid
(d) Citric acid
Option c – Hydrochloric acid
Litmus, a natural pH indicator, is derived from which organism?
(a) Lichens
(b) Earthworms
(c) Ants
(d) Algae
Option a – Lichens
Why are Bases typically stored in glass containers?
(a) They release OH⁻ ions in solution
(b) They conduct Electricity in solution
(c) They are corrosive in nature
(d) They have a slippery texture
Option c – They are corrosive in nature
What compound is found in calamine solution?
(a) Zinc hydroxide
(b) Zinc carbonate
(c) Sodium hydrogen carbonate
(d) Magnesium hydroxide
Option b – Zinc carbonate
Which equation correctly describes the chemical reaction in the chlor-alkali process?
(a) 2NaCl(l) + 2H₂O(l) → 2NaOH(l) + Cl₂(g) + H₂(g)
(b) 2NaCl(aq) + 2H₂O(aq) → 2NaOH(aq) + Cl₂(g) + H₂(g)
(c) 2NaCl(aq) + 2H₂O(l) → 2NaOH(aq) + Cl₂(aq) + H₂(aq)
(d) 2NaCl(aq) + 2H₂O(l) → 2NaOH(aq) + Cl₂(g) + H₂(g)
Option d – 2NaCl(aq) + 2H₂O(l) → 2NaOH(aq) + Cl₂(g) + H₂(g)
What gas is produced when vinegar reacts with baking soda?
(a) Hydrogen
(b) Oxygen
(c) Carbon dioxide
(d) Nitrogen dioxide
Option c – Carbon dioxide
Why is dilute sulphuric acid preferred over concentrated acid during the formation of copper sulphate crystals?
(a) Concentrated sulphuric acid is corrosive
(b) Dilute sulphuric acid forms larger crystals
(c) Concentrated acid doesn’t work effectively
(d) Both (a) and (b)
Option a – Concentrated sulphuric acid is corrosive
During the production of hydrogen chloride gas on a humid day, why is it passed through a guard tube containing calcium chloride?
(a) To absorb the gas
(b) To moisten the gas
(c) To remove moisture from the gas
(d) To remove chloride ions from the gas
Option c – To remove moisture from the gas
The solution of aluminium sulphate in water is:
(a) Acidic
(b) Basic
(c) Amphoteric
(d) Both (b) and (c)
Option a – Acidic
When bleaching powder reacts with a dilute acid, what is formed as a result?
(a) Dilute acid
(b) Dilute Base
(c) Nascent oxygen
(d) Available chlorine
Option a – Dilute acid
In pH, what does the letter ‘p’ represent?
(a) Pressure
(b) Potenz
(c) Physical change
(d) Precipitate
Option b – Potenz
Which of the following does not act as a Base?
(a) B(OH)₃
(b) KOH
(c) Ca(OH)₂
(d) NH₄OH
Option a – B(OH)₃
Ammonium chloride is the Salt formed by the reaction of:
(a) Weak acid and weak Base
(b) Weak acid and strong Base
(c) Strong acid and strong Base
(d) Strong acid and weak Base
Option d – Strong acid and weak Base
Baking soda is chemically known as:
(a) Sodium carbohydrate
(b) Sodium bicarbonate
(c) Sodium sulphate
(d) Sodium hydroxide
Option b – Sodium bicarbonate
What is the pH of pure water?
(a) 1
(b) 6
(c) 7
(d) 10
Option c – 7
Brine is a solution of:
(a) Sodium chloride
(b) Sodium hydroxide
(c) Sodium bicarbonate
(d) Sodium carbonate
Option a – Sodium chloride
What causes temporary hardness in water with respect to calcium and magnesium compounds?
(a) Hydrogen carbonates
(b) Carbonates
(c) Chlorides
(d) Sulphates
Option a – Hydrogen carbonates
Which of the following forms a basic solution and conducts Electricity when dissolved in water?
(a) Hydrochloric acid
(b) Acetic acid
(c) Methanol
(d) Sodium hydroxide
Option d – Sodium hydroxide
Which of the following substances is used as washing soda?
(a) Calcium carbonate
(b) Calcium bicarbonate
(c) Sodium carbonate
(d) Sodium bicarbonate
Option c – Sodium carbonate
Why is ammonium hydroxide classified as a weak Base?
(a) It has low vapour pressure
(b) It is only partially ionised
(c) It is not a metallic hydroxide
(d) It has low density
Option b – It is only partially ionised
What happens to lime water when an excess of carbon dioxide is bubbled through it?
(a) Milkiness increases
(b) No change occurs
(c) Milkiness disappears
(d) None of the above
Option c – Milkiness disappears
Hydrochloric acid gas affects the colour of:
(a) Dry litmus paper
(b) Wet litmus paper
(c) Both dry and wet litmus paper
(d) None of the above
Option b – Wet litmus paper
A pH strip turns green when placed in distilled water. What will be the pH strip’s colour after common Salt is added to the water?
(a) Green
(b) Yellow
(c) Red
(d) Blue
Option a – Green
What causes Plaster of Paris to SET and become hard?
(a) Release of carbon dioxide
(b) Conversion to calcium carbonate
(c) Reaction with water
(d) Loss of water
Option c – Reaction with water
We covered all the acid Bases and Salts Class 10 NCERT solutions above in this post for free so that you can practice well for the exam.
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