Prepare effectively for TNPSC exams with this TNPSC Chemistry Acids, Bases and Salts Quiz. This set contains 20 important multiple-choice questions based on fundamental chemistry concepts frequently asked in TNPSC Group 2 and Group 4 exams.
Understanding acids, bases, pH scale, and salts is essential for scoring well in the General Science section. Take this quiz to test your knowledge and improve accuracy.
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Concept Booster – TNPSC Chemistry Acids, Bases and Salts Quiz
Understanding acids, bases and salts is essential for TNPSC Chemistry preparation. Questions from this topic are frequently asked in Group 2 and Group 4 exams, especially from pH scale, indicators, chemical reactions, and common substances used in daily life.
This concept booster will help you revise important definitions, reactions, and real-life examples that are directly connected to the quiz questions, making your preparation more effective and exam-oriented.
Acids, Bases and Salts – Core Concepts
Acids are substances that produce hydrogen ions (H⁺) when dissolved in water.
Example: Hydrochloric acid (HCl), Sulphuric acid (H₂SO₄)
Bases are substances that produce hydroxide ions (OH⁻) in aqueous solutions.
Example: Sodium hydroxide (NaOH), Potassium hydroxide (KOH)
👉 When a base dissolves in water, it is called an alkali
pH Scale and Nature of Substances
The pH scale ranges from 0 to 14 and helps identify whether a substance is acidic or basic:
- pH < 7 → Acidic solution
- pH = 7 → Neutral solution (pure water)
- pH > 7 → Basic solution
👉 Lower pH = stronger acid
👉 Higher pH = stronger base
Indicators and Their Color Change
Indicators are substances that show whether a solution is acidic or basic.
- Litmus paper
- Acid → Turns red
- Base → Turns blue
- Turmeric indicator
- Base → Turns reddish-brown
- Acid → No change (remains yellow)
👉 These are frequently asked in TNPSC exams
Chemical Reactions of Acids
- Acid + Metal → Salt + Hydrogen gas
👉 Example: HCl + Zn → ZnCl₂ + H₂ - Acid + Carbonate → Salt + Water + Carbon dioxide
👉 Example: HCl + Na₂CO₃ → NaCl + H₂O + CO₂
👉 These reactions are very important for MCQs
Salts and Neutralization Reaction
A salt is formed when an acid reacts with a base.
👉 Acid + Base → Salt + Water
This reaction is called neutralization
Example:
HCl + NaOH → NaCl + H₂O
Types of Salts
- Neutral salts → Formed from strong acid + strong base (NaCl)
- Acidic salts → Strong acid + weak base
- Basic salts → Weak acid + strong base
Common Substances in Daily Life
- Vinegar → Contains acetic acid
- Lemon → Contains citric acid
- Baking soda → Sodium bicarbonate (NaHCO₃)
- Washing soda → Sodium carbonate (Na₂CO₃·10H₂O)
👉 These are direct TNPSC questions
Properties of Acids and Bases
Acids:
- Sour taste
- Turn blue litmus red
- React with metals
Bases:
- Bitter taste
- Turn red litmus blue
- Feel soapy
Real-Life Examples (Acids, Bases and Salts)
- Lemon and Orange 🍋 → Contain citric acid and taste sour
- Vinegar → Contains acetic acid, used in cooking and food preservation
- Curd (Yogurt) → Contains lactic acid
- Soap and Detergents 🧼 → Basic in nature, help remove grease and dirt
- Toothpaste → Contains mild bases to neutralize acids in the mouth and prevent tooth decay
- Antacids → Used to reduce excess stomach acid (e.g., magnesium hydroxide)
- Baking Soda (NaHCO₃) → Used in cooking and baking to make food soft
- Washing Soda (Na₂CO₃·10H₂O) → Used for cleaning clothes and removing stains
- Common Salt (NaCl) → Used in daily food and cooking
- Tooth Decay 🦷 → Occurs when mouth pH falls below 5.5 due to acids
- Acid Rain → Caused by acidic gases dissolving in rainwater, affects plants and buildings
Easy Memory Tricks (Exam Quick Revision)
1. Acid vs Base (Most Important)
👉 “A → H, B → OH”
- Acid → H⁺ ions
- Base → OH⁻ ions
👉 Just remember: A = H, B = OH
2. pH Scale Trick
👉 “7 is Heaven 😇”
- pH < 7 → Acid
- pH = 7 → Neutral
- pH > 7 → Base
👉 Neutral = Perfect balance
3. Litmus Trick
👉 “Acid is Angry → Red”
👉 “Base is Cool → Blue”
- Acid → Red
- Base → Blue
4. Reaction Trick
👉 “Acid + Metal = H₂ (Hydrogen gas)”
👉 “Acid + Carbonate = CO₂ (Gas)”
Just remember:
- Metal → Hydrogen
- Carbonate → CO₂
5. Neutralization Trick
👉 “Acid + Base = Peace ”
- Result → Salt + Water
6. Daily Life Acids Trick
👉 “LCV = Lemon, Curd, Vinegar”
- Lemon → Citric acid
- Curd → Lactic acid
- Vinegar → Acetic acid
7. Bases in Daily Life
👉 “Soap, Paste, Antacid = Base”
- Soap → Cleaning
- Toothpaste → Protect teeth
- Antacid → Reduce acid
Tip : 👉 Before exam, just revise:
- A = H, B = OH
- pH = 7 neutral
- LCV (Lemon, Curd, Vinegar)
👉 You can answer 5–6 questions easily from this topic 💯
Final Revision Tips (Exam Focus )
- Acid → H⁺ ions
- Base → OH⁻ ions
- pH scale = 0 to 14 (very important)
- Remember common acids in daily life
- Focus on reactions with metals & carbonates
Recommended Reference
Refer to NCERT textbook for detailed explanation:
Next → TNPSC Chemistry – Acids, Bases and Salts Quiz 2
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This TNPSC Chemistry Acids Bases and Salts Quiz helps you practice important questions with explanations. Regular practice improves accuracy and confidence in exams.