alleryStart learning →Which one is a strong acid?
- Acetic acid
- Carbonic acid
- Nitric acid
- Citric acid
Show answer and solution
Correct answer: C. Nitric acid
Nitric acid ionises completely in water, unlike citric, acetic and carbonic acids.
Olympiad (Class 7) Acids, bases and salts — practice questions — page 2
Explore 58 free Acids, bases and salts questions in Olympiad (Class 7) Science. Open each question or exercise to read its content, reference answers and available explanation.
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Showing questions 31–58 of 58.
Which one is a strong acid?Read the answer and worked solution →Which solution is the most acidic?Read the answer and worked solution →Solution P has pH 3 and Q has pH 6. Which has more hydrogen ions?Read the answer and worked solution →Pure water has pH 7. Dissolving which substance makes its pH rise above 7?Read the answer and worked solution →Why are rhubarb leaves toxic?Read the answer and worked solution →Which acid is present in tomatoes and spinach?Read the answer and worked solution →Why is citric acid added to pickles and sauces?Read the answer and worked solution →DNA and RNA are examples of which acids?Read the answer and worked solution →Proteins are built from subunits of which acids?Read the answer and worked solution →Salts are made of which kind of particles?Read the answer and worked solution →What holds the ions together in common salt?Read the answer and worked solution →Solid sodium chloride does not conduct electricity but its solution does. Why?Read the answer and worked solution →Which property fits salts made of small ions?Read the answer and worked solution →A salt crystal is struck hard with a hammer. What happens?Read the answer and worked solution →How can solid salt be recovered from its solution in water?Read the answer and worked solution →Lead nitrate and sodium sulfate solutions are mixed. Which insoluble solid forms?Read the answer and worked solution →A salt crystal that holds water in its structure is called aRead the answer and worked solution →Which sulfate is not soluble in water?Read the answer and worked solution →Which liquid dissolves common salt best?Read the answer and worked solution →Common salt is chemically namedRead the answer and worked solution →Fireworks get their colours mainly fromRead the answer and worked solution →Zinc oxide reacts with both acids and bases. Such a substance is calledRead the answer and worked solution →Calcium burns in chlorine gas. Which salt forms?Read the answer and worked solution →Which substance is used in a soda acid fire extinguisher?Read the answer and worked solution →In water, the free H+ ion is found as theRead the answer and worked solution →Which statement is true for sodium hydroxide solution in water?Read the answer and worked solution →Ammonia solution acts as a base though NH3 has no hydroxide. Why?Read the answer and worked solution →An acid raises the hydronium concentration in water. What does a base do?Read the answer and worked solution →
Worked practice questions
Which solution is the most acidic?
- pH 5
- pH 9
- pH 2
- pH 7
Show answer and solution
Correct answer: C. pH 2
A lower pH means higher acidity, and pH 2 is the lowest value.
Solution P has pH 3 and Q has pH 6. Which has more hydrogen ions?
- Q, as its pH is higher
- P, as its pH is lower
- Neither has any
- Both have the same
Show answer and solution
Correct answer: B. P, as its pH is lower
A lower pH indicates a higher concentration of hydrogen cations, so P has more.
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