Acids Bases and Salts (Class 10 Science)
Acids, bases, and salts are fundamental chemical compounds that react with each other and have important industrial and biological applications. Understand
TL;DR: Acids, bases, and salts are fundamental chemical compounds that react with each other and have important industrial and biological applications. Under…
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Acids, bases, and salts are fundamental chemical compounds that react with each other and have important industrial and biological applications. Understand
Acids Bases and Salts MCQs with Answers & Explanations
Q1. What is the pH of a neutral solution?
- 14
- 0
- 1
- 7 ✓ (correct)
Explanation: A neutral solution has a pH of 7, meaning it has an equal concentration of hydrogen and hydroxide ions.
Q2. Which of the following is a strong acid?
- Hydrochloric acid ✓ (correct)
- Acetic acid
- Phosphorous acid
- Carbonic acid
Explanation: Hydrochloric acid (HCl) is a strong acid that completely ionizes in water, while acetic acid and carbonic acid are weak acids.
Q3. The pH of an acidic solution is:
- Equal to 7
- Less than 7 ✓ (correct)
- Between 7 and 14
- Greater than 7
Explanation: An acidic solution has a pH less than 7, indicating a higher concentration of hydrogen ions than hydroxide ions.
Q4. Which of the following is a property of bases?
- Taste sour
- Turn litmus red
- Are slippery to touch ✓ (correct)
- Increase hydrogen ion concentration
Explanation: Bases are slippery to touch due to the formation of a soapy layer on skin, while acids taste sour and turn litmus blue to red.
Q5. The salt formed from the reaction of HCl and NaOH is:
- Sodium hydroxide
- Hydrochloric sodium
- Chlorine oxide
- Sodium chloride ✓ (correct)
Explanation: The reaction HCl + NaOH produces NaCl (sodium chloride) and water in a neutralization reaction.
Q6. Which indicator changes color in both acidic and basic solutions?
- Methyl orange
- Phenolphthalein
- Litmus
- All of the above ✓ (correct)
Explanation: All three indicators change color in acidic and basic solutions, making them useful for detecting pH changes.
Q7. The pH of a solution is -log of:
- Hydrogen ion concentration ✓ (correct)
- Hydroxide ion concentration
- Water concentration
- Salt concentration
Explanation: pH is defined as the negative logarithm of hydrogen ion concentration: pH = -log[H+].
Q8. Which salt is produced when dilute sulfuric acid reacts with zinc?
- Zinc oxide
- Zinc sulfate ✓ (correct)
- Zinc hydroxide
- Zinc chloride
Explanation: The reaction H2SO4 + Zn produces ZnSO4 (zinc sulfate) and hydrogen gas in a displacement reaction.
Q9. The pH of a basic solution is:
- Less than 7
- Equal to 7
- Greater than 7 ✓ (correct)
- Between 0 and 7
Explanation: A basic solution has a pH greater than 7, indicating a higher concentration of hydroxide ions than hydrogen ions.
Q10. Which of the following salts hydrolyzes to form an acidic solution?
- Na2CO3
- KNO3
- NaCl
- FeCl3 ✓ (correct)
Explanation: FeCl3 hydrolyzes to form acidic solution due to the hydrolysis of Fe3+ ions, producing H+ ions.
Frequently Asked Questions
Why do acidic soils require lime for neutralization?
Lime (calcium carbonate) is a base that neutralizes acidic soils by raising their pH to make them suitable for plant growth.
How is salt produced industrially from seawater?
Salt is produced by evaporating seawater, which leaves behind solid sodium chloride crystals.
More Class 10 Science MCQs
- Light Reflection and Refraction
- Electricity
- Life Processes
- Carbon and its Compounds
- Metals and Non-metals
- Matter in Our Surroundings
🤖 Stuck on any of these? Ask Syllab's free AI Tutor to explain step by step →