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Chemistry – Acids, Bases & Salts Complete Notes + Reactions + MCQs (SSC, Railway, UPSC 2026)

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📖 1. Introduction (परिचय)

Hindi:

रसायन विज्ञान (Chemistry) में अम्ल, क्षार और लवण एक बहुत महत्वपूर्ण अध्याय है। SSC, Railway और UPSC परीक्षाओं में इस टॉपिक से सीधे और concept-based प्रश्न पूछे जाते हैं।

English:

Acids, Bases, and Salts are one of the most important topics in Chemistry. Questions are frequently asked in SSC, Railway, and UPSC exams.

🧪 2. What are Acids? (अम्ल क्या हैं?)

📌 Definition

Hindi:

वे पदार्थ जो जल में घुलकर H⁺ आयन देते हैं, अम्ल कहलाते हैं।

English:

Substances that produce H⁺ ions in aqueous solution are called acids.

🔬 Examples

  • HCl (Hydrochloric Acid)
  • H₂SO₄ (Sulphuric Acid)
  • HNO₃ (Nitric Acid)

⚡ Properties of Acids

Hindi:

  • खट्टा स्वाद
  • नीले लिटमस को लाल करता है
  • धातुओं से प्रतिक्रिया कर H₂ गैस बनाता है

English:

  • Sour taste
  • Turns blue litmus red
  • Reacts with metals to release hydrogen gas

🧴 3. What are Bases? (क्षार क्या हैं?)

📌 Definition

Hindi:

वे पदार्थ जो जल में OH⁻ आयन देते हैं, क्षार कहलाते हैं।

English:

Substances that produce OH⁻ ions in solution are called bases.

🔬 Examples

  • NaOH (Sodium Hydroxide)
  • KOH (Potassium Hydroxide)
  • Ca(OH)₂

⚡ Properties of Bases

Hindi:

  • कड़वा स्वाद
  • लाल लिटमस को नीला करता है
  • साबुन जैसा स्पर्श

English:

  • Bitter taste
  • Turns red litmus blue
  • Slippery feel

🧂 4. What are Salts? (लवण क्या हैं?)

📌 Definition

Hindi:

अम्ल और क्षार की अभिक्रिया से बनने वाले पदार्थ को लवण कहते हैं।

English:

Salts are formed by the reaction of acids and bases.

⚗️ Neutralization Reaction

Acid+Base→Salt+WaterAcid + Base \rightarrow Salt + WaterAcid+Base→Salt+Water

🔬 Example

HCl+NaOH→NaCl+H2OHCl + NaOH \rightarrow NaCl + H_2OHCl+NaOH→NaCl+H2​O

📊 5. pH Scale (बहुत महत्वपूर्ण)

📌 Definition

Hindi:

pH स्केल किसी घोल की अम्लीय या क्षारीय प्रकृति को दर्शाता है।

English:

The pH scale measures how acidic or basic a solution is.

📈 Range

pH ValueNature0–7Acidic7Neutral7–14Basic

🎯 Key Points

  • Lower pH → Strong Acid
  • Higher pH → Strong Base
  • Water = pH 7

🧠 6. Strength of Acids & Bases

Hindi:

  • Strong Acid: HCl, H₂SO₄
  • Weak Acid: CH₃COOH

English:

  • Strong Acid: HCl, H₂SO₄
  • Weak Acid: CH₃COOH

⚗️ 7. Important Chemical Reactions

🔹 Acid + Metal

Acid+Metal→Salt+H2Acid + Metal \rightarrow Salt + H_2Acid+Metal→Salt+H2​

🔹 Acid + Carbonate

Acid+Carbonate→Salt+CO2+H2OAcid + Carbonate \rightarrow Salt + CO_2 + H_2OAcid+Carbonate→Salt+CO2​+H2​O

🔹 Base + Acid

Base+Acid→Salt+WaterBase + Acid \rightarrow Salt + WaterBase+Acid→Salt+Water

🧠 8. Important Concepts

🔹 Indicators

IndicatorAcidBaseLitmusRedBluePhenolphthaleinColorlessPink

🔹 Everyday Examples

Hindi:

  • Lemon → Acid
  • Soap → Base

English:

  • Lemon → Acid
  • Soap → Base

🎯 9. Exam-Oriented Facts

  • pH scale introduced by Sørensen
  • Strong acids have low pH
  • Neutralization used in antacids

🧪 10. MCQs Practice

Q1. अम्ल का pH कितना होता है?

A. >7

B. <7 ✅

C. =7

D. >14

Q2. NaOH क्या है?

A. Acid

B. Base ✅

C. Salt

D. Gas

Q3. Neutralization क्या बनाता है?

A. Acid

B. Base

C. Salt + Water ✅

D. Gas

Q4. Litmus का रंग acid में क्या होगा?

A. Blue

B. Red ✅

C. Green

D. Yellow

Q5. pH scale किसने दिया?

A. Newton

B. Sørensen ✅

C. Dalton

D. Boyle

📌 11. Previous Year Trends

Hindi:

SSC/Railway में पूछा जाता है:

  • pH value
  • Indicators
  • Chemical reactions

English:

Frequently asked:

  • pH values
  • Indicators
  • Reactions

🔚 12. Conclusion

Hindi:

Acids, Bases और Salts chemistry का core topic है और इसे समझना exams के लिए बहुत जरूरी है।

English:

Acids, Bases, and Salts form the core of chemistry and are essential for exams.

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