Overview: Chemistry Notes on Acids and Base
General Science subject me Chemistry section se Acids, Bases, and Salts sabse important aur high-scoring topics me se ek hai. SSC CGL, CHSL, RRB NTPC, aur Group D jaise competitive exams me pH scale values, natural sources of acids, Arrhenius/Bronsted-Lowry theories, aur neutralisation reactions par har saal direct questions puche jaate hain.
Key Highlights of this Study PDF
- Arrhenius, Brønsted-Lowry & Lewis Concepts: Acids aur Bases ki clear theoretical definitions.
- Complete pH Scale Guide: Everyday substances (Blood, Milk, Vinegar, Lemon Juice) ki exact pH values.
- Natural Acids & Sources: Tartaric, Citric, Oxalic, Formic, aur Lactic acids ke natural sources ki complete list.
- Indicators & Colors: Litmus paper, Phenolphthalein, aur Methyl Orange ka acidic/basic behavior.
PDF Material Details
| Attribute | Specification Details |
|---|---|
| Topic Name | Chemistry Notes on Acids and Base |
| Category | General Science — Inorganic & Physical Chemistry |
| Language | English / Hindi Mix (Aspirant Friendly) |
| Suitable For | RRB NTPC, SSC CGL, SSC CHSL, RRB Group D, State Exams |
| Key Coverage | pH Values, Indicators Table, Acid Sources, Salt Types & PYQs |
Practice MCQs on Acids and Bases
Niche diye gaye high-yield multiple-choice questions ko solve karke apni concept clarity test karein:
Q1. Which acid is present in sour milk or curd?
Check Answer
Answer: Lactic Acid. (Lactic acid is produced due to the fermentation of lactose present in milk by Lactobacillus bacteria).
Q2. What is the pH value of pure distilled water at 25°C?
Check Answer
Answer: 7 (Neutral). A pH of 7 represents neutral solutions with equal H+ and OH- ion concentrations.
Q3. Which of the following turns red litmus paper to blue?
Check Answer
Answer: Base / Alkaline Solution. Bases turn red litmus to blue, while acids turn blue litmus to red.
Q4. What acid is secreted in the human stomach to help in food digestion?
Check Answer
Answer: Hydrochloric Acid (HCl). It creates an acidic medium necessary for the enzyme pepsin to digest proteins.
Q5. The pain caused by an ant sting is due to the injection of which acid?
Check Answer
Answer: Formic Acid (Methanoic Acid – HCOOH). Mild bases like baking soda can neutralize this acidic effect.
Q6. What color does Phenolphthalein indicator show in a basic solution?
Check Answer
Answer: Pink. Phenolphthalein remains colorless in acidic solutions and turns bright pink in basic solutions.
Q7. Which gas is evolved when an acid reacts with a metal?
Check Answer
Answer: Hydrogen Gas (H2). Acid + Active Metal ➔ Salt + Hydrogen Gas (burns with a pop sound).
Q8. What is the approximate pH range of normal human blood?
Check Answer
Answer: 7.35 to 7.45 (Slightly Basic).
Q9. Which chemical compound is commonly known as Milk of Magnesia?
Check Answer
Answer: Magnesium Hydroxide [Mg(OH)2]. It is used as an antacid to cure acidity in stomach.
Q10. Which acid is present in vinegar?
Check Answer
Answer: Acetic Acid (Ethanoic Acid – CH3COOH). Vinegar contains about 5-8% acetic acid in water.
Q11. According to Bronsted-Lowry concept, an acid is a substance that:
Check Answer
Answer: Donates a Proton (H+ ion).
Q12. What is the chemical formula of Washing Soda?
Check Answer
Answer: Na2CO3·10H2O (Sodium Carbonate Decahydrate).
Q13. Tooth decay starts when the pH of the mouth falls below:
Check Answer
Answer: 5.5. Below pH 5.5, the acid dissolves calcium phosphate present in tooth enamel.
Q14. Which acid is used in lead-acid storage batteries?
Check Answer
Answer: Sulfuric Acid (H2SO4).
Q15. Tomatoes are a natural source of which acid?
Check Answer
Answer: Oxalic Acid.
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FAQs: Chemistry Notes on Acids and Base
Q1: What is the difference between Arrhenius acid and Lewis acid?
Ans: An Arrhenius acid produces Hydrogen ions (H+) in an aqueous solution, whereas a Lewis acid accepts an electron pair from another chemical species.
Q2: Why does dry HCl gas not change the color of dry litmus paper?
Ans: Dry HCl gas does not produce H+ ions without water. Acids display acidic behavior and dissociate into ions only in the presence of water/aqueous medium.
Q3: What happens in a Neutralisation Reaction?
Ans: In a neutralisation reaction, an acid reacts with a base to form Salt and Water, releasing heat energy (Acid + Base ➔ Salt + Water).
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