MCQ questions for class 7 Science Chapter 5 Acids, Bases and Salts
Question 1: Which of the following substances is not acidic?
Lemon juice
Vinegar
Baking soda
Tomato juice
Question 2: What is the taste of lemon juice?
Sour
Bitter
Sweet
Salty
Question 3: Which of the following is a property of bases?
Turns blue litmus paper red
Tastes sour
Feels slippery
Forms a precipitate with calcium chloride
Question 4: What is the color change observed when red litmus paper is dipped into a solution of lemon juice?
Remains red
Turns blue
Turns green
Turns yellow
Question 5: Which of the following is a strong base?
Ammonia
Sodium hydroxide
Acetic acid
Carbon dioxide
Question 6: What is the term for a substance that can act as both an acid and a base?
Neutral substance
Ionic substance
Alkaline substance
Aqueous substance
Question 7: Which of the following is a natural indicator?
Turmeric
Phenolphthalein
Methyl orange
Litmus
Question 8: What is the color change observed when blue litmus paper is dipped into a solution of vinegar?
Remains blue
Turns red
Turns green
Turns yellow
Question 9: Which of the following is a weak acid?
Hydrochloric acid
Sulfuric acid
Citric acid
Nitric acid
Question 10: What is the term for the reaction between an acid and a base to form water and a salt?
Neutralization
Oxidation
Reduction
Combustion
Question 11: Which of the following is an example of a strong acid?
Acetic acid
Citric acid
Hydrochloric acid
Carbonic acid
Question 12: What is the term for the solution formed by dissolving a gas in water?
Suspension
Emulsion
Solution
Aqueous solution
Question 13: Which of the following is used as an antacid to neutralize excess stomach acid?
Sodium hydroxide
Baking soda
Magnesium hydroxide
Ammonium chloride
Question 14: What is the pH range of neutral substances?
0 to 7
7 to 14
1 to 6
0 to 14
Question 15: Which of the following is a common indicator for testing the presence of acids and bases?
Sulfuric acid
Hydrochloric acid
Litmus
Sodium hydroxide
Question 16: What is the term for the ion formed by the loss of a proton from an acid?
Hydronium ion
Hydroxide ion
Acetate ion
Conjugate base
Question 17: What is the term for the ion formed by the gain of a proton by a base?
Hydronium ion
Hydroxide ion
Acetate ion
Conjugate acid
Question 18: What is the color change observed when red litmus paper is dipped into a solution of baking soda?
Remains red
Turns blue
Turns green
Turns yellow
Question 19: Which of the following is a property of acids?
Tastes bitter
Feels slippery
Turns blue litmus paper red
Turns red litmus paper blue
Question 20: What is the term for the substances that change color when added to acidic or basic solutions?
Indicators
Reactants
Catalysts
Precipitates
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