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All questions of Acids, Bases And Salts for Class 7 Exam
Which base is commonly used in the production of soap?- a)Sodium hydroxide
- b)Calcium hydroxide
- c)Potassium hydroxide
- d)Magnesium hydroxide
Correct answer is option 'A'. Can you explain this answer?
Which base is commonly used in the production of soap?
a)
Sodium hydroxide
b)
Calcium hydroxide
c)
Potassium hydroxide
d)
Magnesium hydroxide
|
Prepworks Coaching answered |
Sodium hydroxide is commonly used in the production of soap as it can react with fats and oils to form soap.
Which acid is found in citrus fruits?- a)Hydrochloric acid
- b)Nitric acid
- c)Citric acid
- d)Sulphuric acid
Correct answer is option 'C'. Can you explain this answer?
Which acid is found in citrus fruits?
a)
Hydrochloric acid
b)
Nitric acid
c)
Citric acid
d)
Sulphuric acid
|
Bespoke Classes answered |
Citric acid is a weak organic acid that is found in citrus fruits such as lemons and oranges.
Which of the following is a strong base?- a)Ammonia
- b)Sodium hydroxide
- c)Calcium hydroxide
- d)Potassium hydroxide
Correct answer is option 'B'. Can you explain this answer?
Which of the following is a strong base?
a)
Ammonia
b)
Sodium hydroxide
c)
Calcium hydroxide
d)
Potassium hydroxide
|
|
Prepworks Coaching answered |
Sodium hydroxide is a strong base that is commonly used in cleaning products and industrial processes.
Which of the following is an example of a strong acid?- a)Acetic acid
- b)Hydrochloric acid
- c)Carbonic acid
- d)Citric acid
Correct answer is option 'B'. Can you explain this answer?
Which of the following is an example of a strong acid?
a)
Acetic acid
b)
Hydrochloric acid
c)
Carbonic acid
d)
Citric acid
|
Foothill Academy answered |
Hydrochloric acid is a strong acid that is commonly used in industrial processes and laboratory experiments.
Which acid is commonly used as a preservative in food?- a)Acetic acid
- b)Citric acid
- c)Lactic acid
- d)Ascorbic acid
Correct answer is option 'A'. Can you explain this answer?
Which acid is commonly used as a preservative in food?
a)
Acetic acid
b)
Citric acid
c)
Lactic acid
d)
Ascorbic acid
|
|
Bespoke Classes answered |
Acetic acid is commonly used as a preservative in food products such as pickles and sauces.
Which salt is commonly used in the production of glass?- a)Sodium chloride
- b)Calcium carbonate
- c)Sodium carbonate
- d)Potassium chloride
Correct answer is option 'C'. Can you explain this answer?
Which salt is commonly used in the production of glass?
a)
Sodium chloride
b)
Calcium carbonate
c)
Sodium carbonate
d)
Potassium chloride
|
|
Prepworks Coaching answered |
Sodium carbonate is commonly used in the production of glass as it can lower the melting point of glass and make it easier to work with.
Which acid is commonly found in milk?- a)Citric acid
- b)Lactic acid
- c)Acetic acid
- d)Ascorbic acid
Correct answer is option 'B'. Can you explain this answer?
Which acid is commonly found in milk?
a)
Citric acid
b)
Lactic acid
c)
Acetic acid
d)
Ascorbic acid
|
|
Prepworks Coaching answered |
Lactic acid is commonly found in milk and other dairy products and is responsible for their sour taste.
Which of the following is a neutralization reaction?- a)NaOH + H2SO4 → Na2SO4 + H2O
- b)HCl + NaOH → NaCl + H2O
- c)Ca(OH)2 + 2HCl → CaCl2 + 2H2O
- d)None of the above
Correct answer is option 'B'. Can you explain this answer?
Which of the following is a neutralization reaction?
a)
NaOH + H2SO4 → Na2SO4 + H2O
b)
HCl + NaOH → NaCl + H2O
c)
Ca(OH)2 + 2HCl → CaCl2 + 2H2O
d)
None of the above
|
|
Prepworks Coaching answered |
This is a neutralization reaction as the acid (HCl) and base (NaOH) react to form a salt (NaCl) and water (H2O).
Which base is commonly used in cleaning products?- a)Ammonia
- b)Sodium hydroxide
- c)Calcium hydroxide
- d)Potassium hydroxide
Correct answer is option 'B'. Can you explain this answer?
Which base is commonly used in cleaning products?
a)
Ammonia
b)
Sodium hydroxide
c)
Calcium hydroxide
d)
Potassium hydroxide
|
|
Bespoke Classes answered |
Sodium hydroxide is a strong base that is commonly used in cleaning products such as drain cleaners and oven cleaners.
Which of the following is a salt?- a)Hydrochloric acid
- b)Sulphuric acid
- c)Sodium chloride
- d)Nitric acid
Correct answer is option 'C'. Can you explain this answer?
Which of the following is a salt?
a)
Hydrochloric acid
b)
Sulphuric acid
c)
Sodium chloride
d)
Nitric acid
|
|
Bespoke Classes answered |
Sodium chloride is a salt that is commonly used in cooking and food preservation.
Which of the following is a basic substance?- a)Lemon juice
- b)Ammonia
- c)Vinegar
- d)Tomato juice
Correct answer is option 'B'. Can you explain this answer?
Which of the following is a basic substance?
a)
Lemon juice
b)
Ammonia
c)
Vinegar
d)
Tomato juice
|
|
Bespoke Classes answered |
Ammonia is a basic substance due to the presence of ammonia gas.
Which acid is commonly used in the manufacture of fertilizers?- a)Sulphuric acid
- b)Nitric acid
- c)Hydrochloric acid
- d)Acetic acid
Correct answer is option 'B'. Can you explain this answer?
Which acid is commonly used in the manufacture of fertilizers?
a)
Sulphuric acid
b)
Nitric acid
c)
Hydrochloric acid
d)
Acetic acid
|
|
Prepworks Coaching answered |
Nitric acid is commonly used in the manufacture of fertilizers as it can provide essential nutrients to plants.
Which of the following is a neutral substance?- a)Lemon juice
- b)Vinegar
- c)Water
- d)Ammonia
Correct answer is option 'C'. Can you explain this answer?
Which of the following is a neutral substance?
a)
Lemon juice
b)
Vinegar
c)
Water
d)
Ammonia
|
|
Bespoke Classes answered |
Water is a neutral substance as it has a pH of 7 and does not show any acidic or basic properties.
Which base is found in antacids?- a)Sodium hydroxide
- b)Calcium hydroxide
- c)Potassium hydroxide
- d)Magnesium hydroxide
Correct answer is option 'D'. Can you explain this answer?
Which base is found in antacids?
a)
Sodium hydroxide
b)
Calcium hydroxide
c)
Potassium hydroxide
d)
Magnesium hydroxide
|
|
Prepworks Coaching answered |
Magnesium hydroxide is commonly used in antacids as it can neutralize excess stomach acid.
Which of the following is a basic indicator?- a)Litmus
- b)Phenolphthalein
- c)Methyl orange
- d)None of the above
Correct answer is option 'C'. Can you explain this answer?
Which of the following is a basic indicator?
a)
Litmus
b)
Phenolphthalein
c)
Methyl orange
d)
None of the above
|
|
Prepworks Coaching answered |
Methyl orange is a synthetic indicator that changes color in the presence of basic substances.
Which of the following is a weak acid?- a)Hydrochloric acid
- b)Sulphuric acid
- c)Acetic acid
- d)Nitric acid
Correct answer is option 'C'. Can you explain this answer?
Which of the following is a weak acid?
a)
Hydrochloric acid
b)
Sulphuric acid
c)
Acetic acid
d)
Nitric acid
|
|
Prepworks Coaching answered |
Acetic acid is a weak acid that is found in vinegar and can be used for cooking and preservation.
Which acid is used in car batteries?- a)Hydrochloric acid
- b)Sulphuric acid
- c)Nitric acid
- d)Acetic acid
Correct answer is option 'B'. Can you explain this answer?
Which acid is used in car batteries?
a)
Hydrochloric acid
b)
Sulphuric acid
c)
Nitric acid
d)
Acetic acid
|
|
Bespoke Classes answered |
Sulphuric acid is commonly used in car batteries as it is a strong acid and can provide high energy.
Which substance is used as an indicator for acidic substances?- a)Phenolphthalein
- b)Methyl orange
- c)Litmus
- d)None of the above
Correct answer is option 'C'. Can you explain this answer?
Which substance is used as an indicator for acidic substances?
a)
Phenolphthalein
b)
Methyl orange
c)
Litmus
d)
None of the above
|
|
Bespoke Classes answered |
Litmus is a natural dye that changes color in the presence of acidic or basic substances.
Which of the following is a natural indicator?- a)Methyl red
- b)Phenolphthalein
- c)Litmus
- d)None of the above
Correct answer is option 'C'. Can you explain this answer?
Which of the following is a natural indicator?
a)
Methyl red
b)
Phenolphthalein
c)
Litmus
d)
None of the above
|
Tutorpedia Coaching answered |
Litmus is a natural dye that is used as an indicator for acidic and basic substances.
Which of the following is an acidic substance?- a)Baking soda
- b)Vinegar
- c)Soap
- d)Bleach
Correct answer is option 'B'. Can you explain this answer?
Which of the following is an acidic substance?
a)
Baking soda
b)
Vinegar
c)
Soap
d)
Bleach
|
|
Bespoke Classes answered |
Vinegar is an acidic substance due to the presence of acetic acid.
Chapter doubts & questions for Acids, Bases And Salts - Class 7 Oxford Science: Chapter Notes, Worksheets & Tests 2025 is part of Class 7 exam preparation. The chapters have been prepared according to the Class 7 exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for Class 7 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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