Class 7th Science Chapter – 4 Acids, Bases and Salts
| Textbook | NCERT |
| Class | 7th |
| Subject | Science |
| Chapter | 4th |
| Chapter Name | Acids, Bases and Salts |
| Category | Class 7th Science MCQ |
| Medium | English |
| Source | Last Doubt |
| Class 7th Science Chapter – 4 Acids, Bases and Salts MCQ Is toothpaste an acid?, What is base class 7?, What is 5th bases?, Is soap an acid or base?, What is the pH of human blood?, What is the pH of milk?, Is Mustard an acid?, Is Honey acidic? |
Class 7th Science Chapter – 4 Acids, Bases and Salts
Chapter – 4
Acids, Bases and Salts
MCQ
| (1) Acids taste A. Sour B. Sweet C. Bitter D. Salty Answer – (A) Sour |
| (2) Bases taste A. Sweet B. Sour C. Bitter D. Salty Answer – (C) Bitter |
| (3) Colours of phenolphthalein indicator in acidic and basic medium, respectively are A. Pink and colourless B. Colourless and pink C. Blue and red D. Red and blue Colourless Pink Answer – (B) Colourless and pink |
| (4) The nature of bases is A. Acidic B. Basic C. Neutral D. All of these Answer – (B) Basic |
| (5) Which of the following feel soapy on touching? A. Acid B. Base C. Salt D. None of these Answer – (B) Base |
| (6) Which of the following is a natural indicator? A. China rose petal B. Turmeric C. Litmus D. All of these Answer – (D) All of these |
| (7) The most commonly used natural indicator is A. Turmeric B. Beetroot C. China rose petal D. Litmus Answer – (D) Litmus |
| (8) The correct way of making a solution of acid in water is to A. Add water to acid B. Add acid to water C. Mix acid and water simultaneously D. Add water to acid in a shallow container Answer – (B) Add acid to water |
| (9) Which of the following is basic in nature? A. Lime water B. Baking soda C. Both (a) and (b) D. Lemon juice Answer – (C) Both (a) and (b) |
| (10) Litmus is extracted from A. Curd B. Grapes C. Lichens D. Cabbage Answer – (C) Lichens |
| (11) Calcium hydroxide is found in A. Window cleaner B. Lime water C. Soap D. Lime juice Answer – (B) Lime water |
| (12) On adding phenolphthalein indicator to a colorless solution, no change is observed. The nature of the solution may be A. Acidic or basic B. Basic C. Acidic or neutral D. Basic or neutral Answer – (C) Acidic or neutral |
| (13) Neutralisation reaction is a A. Physical and reversible change B. Physical and irreversible change C. Chemical and reversible change D. Chemical and irreversible change Answer – (D) Chemical and irreversible change |
| (14) When a drop of vinegar solution is put on the litmus paper, it turns A. Red B. Blue C. Green D. Yellow Answer – (A) Red |
| (15) Tap water is A. Acidic B. Basic C. Neutral D. Depends on source Answer – (D) Depends on source |
| (16) When phenolphthalein is added to a acidic solution, it gives A. Pink colour B. Red colour C. Blue colour D. No colour Answer – (D) No colour |
| (17) A neutralisation reaction gives A. Salt and water B. Acid and salt C. Base and salt D. Acid and base Answer – (A) Salt and water |
| (18) Our stomach contains A. Hydrochloric acid B. Sodium hydroxide C. Sulphuric acid D. Nitric acid Answer – (A) Hydrochloric acid |
| (19) When we suffer from acidity, we should take A. Iron tonic B. Vitamins C. Antacid D. Lactocalamine Answer – (C) Antacid |
| (20) When an ant bites, it injects A. Acidic liquid B. Basic liquid C. Both (a) and (b) D. Neutral liquids Answer – (A) Acidic liquid |
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