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
Bases turn red litmus blue and acids turn blue litmus red. A student tested a liquid with red litmus paper and it stayed red with no change. This shows that the liquid.
(a) must be pure water
(b) must be an acid
(c) is not a base
(d) is neither a base nor an acid
Option c – is not a base
Which one among the following is the correct order of strength of acids?
(a) H₂SO4> H3PO3 > CH3COOH
(b) H3PO3 > H₂SO4 > CH3COOH
(c) CH3COOH > H3PO3 > H₂SO4
(d) CH3COOH > H₂SO4 > H3PO3
Option a – H₂SO4> H3PO3 > CH3COOH
The pH of fresh milk is 6. When it turns sour, the pH
(a) becomes < 6
(b) remains the same i.e., 6
(c) becomes > 6
(d) becomes neutral, i.e., 7
Option a – becomes
Which one among the following is 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
The pH of fresh groundwater slightly decreases upon exposure to air because
(a) carbon dioxide from the air is dissolved in the water
(b) oxygen from the air is dissolved in the water
(c) the dissolved carbon dioxide of the groundwater escapes into the air
(d) the dissolved oxygen of the groundwater escapes into the air
Option a – carbon dioxide from the air is dissolved in the water
Aluminium is used in thermite welding because
(a) aluminium is a light metal
(b) aluminium has more affinity for oxygen
(c) aluminium is a strong oxidising agent
(d) aluminium is a reactive metal
Option b – aluminium has more affinity for oxygen
Antacids are commonly used to get rid of acidity in the stomach. A commonly used antacid is
(a) sodium hydrogen phthalate
(b) magnesium hydroxide
(c) calcium hydroxide
(d) manganese acetate
Option b – magnesium hydroxide
In paper manufacturing, degumming of the raw material is done using
(a) sulphuric acid.
(b) bleaching powder
(c) caustic soda
(d) nitric acid
Option b – bleaching powder
Dolomite powder is applied in some agricultural lands. The purpose of applying it is to
(a) increase the pH of the soil
(b) lower the pH of the soil
(c) increase the phosphorus content of the soil
(d) increase the nitrogen content of the soil
Option a – increase the pH of the soil
Which one of the following salts when dissolved in water makes the solution basic?
(a) Sodium chloride
(b) Copper sulphate
(c) Ferric chloride
(d) Sodium acetate
Option d – Sodium acetate
Arrange the following bases in increasing order of their, basic strength 1. Sodium hydroxide 2. Magnesium hydroxide 3. Aluminium hydroxide 4. Ammonium hydroxide Select the correct answer using the code given below Codes :
(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 one among the following is not a property of salt?
(a) Salts have ordered packing arrangements called lattices
(b) Salts have low melting points but high boiling points
(c) Salts are brittle
(d) Salts conduct electricity when dissolved in water or even in the molten state
Option b – Salts have low melting points but high boiling points
The concentration of hydrochloric acid in a given solution is 10-8 M. What is the value of pH for this solution?
(a) 7
(b) > 7 but not 14
(c) <7
(d) 14
Option d – 14
The human stomach produces acid ‘X’ which helps in the digestion of food. Acid ‘X’ is
(a) acetic acid
(b) methanoic acid
(c) hydrochloric acid
(d) citric acid
Option c – hydrochloric acid
Natural indicator litmus is extracted from
(a) lichens
(b) earthworms
(c) ants
(d) algae
Option a – lichens
Why bases are kept in glass bottles?
(a) Bases produce OH-ions in aqueous solutions
(b) Basic solutions are conducted in nature
(c) Bases are corrosive in nature
(d) Basis has a soapy texture
Option c – Bases are corrosive in nature
Calamine solution contains
(a) zinc hydroxide
(b) zinc carbonate
(c) sodium hydrogen carbonate
(d) magnesium hydroxide
Option b – zinc carbonate
Identify the correct representation of the reaction occurring during the chloralkali process
(a) 2NaCI(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)
When vinegar reacts with baking soda the gas evolved is
(a) hydrogen
(b) oxygen
(c) carbon dioxide
(d) nitrogen dioxide
Option c – carbon dioxide
While preparing copper sulphate crystals from copper sulphate solution, dilute sulphuric acid is used instead of concentrated sulphuric acid, because
(a) concentrated sulphuric acid is corrosive in nature
(b) dilute sulphuric acid makes large crystals
(c) concentrated acid is ineffective
(d) Both (a) and (b)
Option a – concentrated sulphuric acid is corrosive in nature
During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to
(a) absorb the evolved gas
(b) moisten the gas
(c) absorb moisture from the gas
(d) absorb Cl ions from the evolved gas
Option c – absorb moisture from the gas
The aqueous solution of aluminium sulphate is :
(a) Acidic
(b) Basic
(c) Amphoteric
(d) Both (b) and (c)
Option a – Acidic
Available chlorine is formed when bleaching powder reacts with :
(a) dilute acid
(b) dilute base
(c) nascent oxygen
(d) chlorine
Option a – dilute acid
What does the ‘p’ in pH stand for?
(a) Pressure
(b) Potenz
(c) Physical change
(d) Precipitate
Option b – Potenz
Which one of the following is not a base?
(a) B(OH)3
(b) KOH
(c) Ca(OH)₂
(d) NH4OH
Option a – B(OH)3
Ammonium chloride is a salt of
(a) weak Acid and Weak Base
(b) weak Acid ami Strong Base
(c) strong Acid and Strong Base
(d) strong Acid and Weak Base
Option d – strong Acid and Weak Base
Baking soda is
(a) sodium carbohydrate
(b) sodium bicarbonate
(c) sodium sulphate
(d) sodium hydroxide
Option b – sodium bicarbonate
What is the pH value of pure water?
(a) 1
(b) 6
(c) 7
(d) 10
Option c – 7
Brine is an aqueous solution of
(a) NaCl
(b) NaOH
(c) NaHCO3
(d) Na₂CO3
Option a – NaCl
Temporary hardness in water is due to which one of the following of Calcium and Magnesium?
(a) Hydrogen carbonates
(b) Carbonates
(c) Chlorides
(d) Sulphates
Option a – Hydrogen carbonates
Which compound, when dissolved in water, conducts electricity and forms a basic solution?
(a) HCI
(b) CH3COOH
(c) CH3OH
(d) NaOH
Option d – NaOH
Which one among the following chemical is used as washing soda?
(a) Calcium carbonate
(b) Calcium bicarbonate
(c) Sodium carbonate
(d) Sodium bicarbonate
Option c – Sodium carbonate
Ammonium hydroxide is a weak base because
(a) it has low vapour pressure
(b) it is only slightly ionised
(c) it is not a hydroxide of any metal
(d) it has a low density
Option b – it is only slightly ionised
On passing excess carbon dioxide through lime water
(a) the milkiness of lime water increases
(b) there is no change in the milkiness of lime water
(c) the milkiness of lime water disappears
(d) None of the above is correct.
Option c – the milkiness of lime water disappears
HCl gas changes the colour of
(a) dry litmus paper
(b) wet litmus paper
(c) Both dry and wet litmus paper
(d) None of the above is correct
Option b – wet litmus paper
The colour of pH paper when put in distilled water changed to green. Now some common salt is added to water and pH paper is tested in this solution. The colour of pH paper in this case is likely to be
(a) green
(b) yellow
(c) red
(d) blue
Option a – green
Plaster of Paris hardens by
(a) giving off CO₂
(b) changing into CaCO3
(c) combining with water
(d) giving out water
Option c – combining with water
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