CBSE Class 10 Science Acids Bases and Salts MCQs Set A

MCQ Questions for NCERT Class 10 Science Acids Bases and Salts

Question : What happens when a base is added to vanilla?
(a) Color of vanilla changes into red
(b) Vanilla becomes colorless
(c) Vanilla loses its smell
(d) Nothing happens

Answer  :  C

Question :  Calcium phosphate is present in tooth enamel. Its nature is
(a) basic
(b) acidic
(c) neutral
(d) amphoteric

Answer  :  A

Question : The odour of acetic acid resembles that of
(a) Rose
(b) Burning Plastic
(c) Vinegar
(d) Kerosene

Answer  :  C

Question : Ammonium sulphate salt is
(a) Basic salt
(b) Acidic salt
(c) Neutral salt
(d) Complex salt

Answer  :  A

Question : An indicator is one kind of the following compound
(a) Strong acid only
(b) Reducing agent
(c) Weak base or acid only
(d) Complex salt

Answer  :  C

Question : Chemical formula of baking soda is:
(a) MgSO4
(b) Na2CO3
(c) NaHCO3
(d) MgCO3

Answer  :  C

Question : 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

Answer  : D

Question : What is the pH value of sodium chloride?
(a) 7
(b) More than 7
(c) Less than 7
(d) Zero

Answer  : A

Question : Dilute acid does not produce carbon dioxide on being treated with:
(a) Marble
(b) Lime
(c) Baking soda
(d) Limestone

Answer  : B

Question : Setting of Plaster of Paris takes place due to
(a) Oxidation
(b) Reduction
(c) Dehydration
(d) Hydration

Answer  : D

Question : Sodium carbonate is a basic salt because it is a salt of a
(a) strong acid and strong base
(b) weak acid and weak base
(c) strong acid and weak base
(d) weak acid and strong base

Answer  : D

Question : Lime water is
(a) CaO
(b) Ca(OH)₂
(c) CaCO₃
(d) CaCI₂

Answer  : B

Question : Which one of the following types of medicines is used for treating indigestion?
(a) Antibiotics
(b) Analgesic
(c) Antacid
(d) Antiseptic

Answer  :  C

Question. You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. Which of them will turn red litmus to blue.
(a) Acid
(b) Base
(c) Water
(d) All of the above

Answer : B

Question. Acids react with metals to liberate _________gas
(a) Carbon dioxide
(b) Carbon monoxide
(c) Hydrogen
(d) Water

Answer : C

Question. Acids react with metal carbonates to liberate ______ gas
(a) Carbon dioxide
(b) Carbon monoxide
(c) Hydrogen
(d) Water

Answer : A

Question. Lime water turns milky when carbon dioxide is passed due to the formation of ______.
(a) CaCO₃
(b) CaO
(c) CO₂
(d) CaSO₄

Answer : A

Question. The milkiness (on passing excess carbondioxide gas through lime water) disappears due to the formation of:
(a) Calcium carbonate CaCO₃
(b) Calcium hydrogen carbonate CaHCO₃
(c) Calcium oxide CaO
(d) Calcium Nitrate Ca(NO₃)₂

Answer : B

Question. Acids react with bases to form salt and water. This reaction is known as:
(a) Combination
(b) Decomposition
(c) Neutralisation
(d) reduction

Answer : C

Question. A calcium compound reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Identify the compound and the gas evolved)
(a) Calcium Carbonate, Carbon dioxide
(b) Calcium chloride, carbondioxide
(c) Calcium oxide, hydrogen
(d) Calcium carbonate, hydrogen

Answer : A

Question. How is the concentration of hydronium ions (H₃O⁺) affected when a solution of an acid is diluted?
(a) Increases
(b) Decreases
(c) Remains the same
(d) Becomes zero

Answer : A

Question. Why does dry HCl gas not change the colour of the dry litmus paper?
(a) Blue litmus becomes dry in presence of dry HCl gas
(b) No H₃O⁺ ions will be present, litmus changes colour only in the presence of H₃O⁺ ions
(c) HCl gas acts asa dehydrating agent
(d) None of the above

Answer : B

Question. When a bee stings, immediately a paste of lime is put on the sting. Why?
(a) Bee sting is made of a base
(b) Bee sting contains an acid called formic acid) It gets neutralised with CaO
(c) Bee sting is acidic due to hydrochloric acid and this is neutralised
(d) All of the above.

Answer : B

Question : Methyl orange is
(a) Pink in acidic medium, yellow in basic medium
(b) Yellow in acidic medium, pink in basic medium
(c) Colourless in acidic medium, pink in basic medium
(d) Pink in acidic medium, colourless in basic medium.

Answer  :  A

Question : Tooth enamel is made up of
(a) calcium phosphate
(b) calcium carbonate
(c) calcium oxide
(d) potassium

Answer  :  A

Question : If pH of solution is 13, it means that if is
(a) Weakly acidic
(b) Weakly basic
(c) Strongly acidic
(d) Strongly Basic

Answer  : D

Question : When hydrogen chloride gas is prepared 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

Answer  :  C

Question : The Ph of a solution of HCL is 4. This shows that the molarity of the solution is
(a) 4.0M
(b) 0.4M
(c) 0.0001M
(d) 0.001M

Answer  :  A