Acids, Bases & Salts

What you'll learn

Understand acids, bases and salts with indicators, the pH scale, neutralisation reactions and everyday salts like baking soda, washing soda and plaster of Paris — explained simply for Class 10.

This chapter has

Acids, Bases & Salts — solved practice questions

6 Class 10 Science questions with step-by-step solutions. Attempt each, then reveal the answer.

1. Q1easy

   What is the pH of a neutral solution such as pure water?

   • A0
   • B7
   • C14
   • D1
   Show answer & solution

   Correct answer: (B) 7

   A neutral solution has pH = 7. Below 7 is acidic, above 7 is basic.

2. Q2easy

   Acids turn blue litmus paper to which colour?

   • Ablue
   • Bred
   • Cgreen
   • Dno change
   Show answer & solution

   Correct answer: (B) red

   Acids turn blue litmus RED. (Bases turn red litmus blue.)

3. Q3easy

   A solution with a pH less than 7 is:

   • Aacidic
   • Bbasic
   • Cneutral
   • Da salt
   Show answer & solution

   Correct answer: (A) acidic

   pH < 7 → acidic, pH = 7 → neutral, pH > 7 → basic.

4. Q4medium

   Which gas is usually produced when a dilute acid reacts with a metal?

   • Aoxygen
   • Bhydrogen
   • Ccarbon dioxide
   • Dchlorine
   Show answer & solution

   Correct answer: (B) hydrogen

   Acid + metal → salt + hydrogen gas. e.g. Zn + 2HCl → ZnCl₂ + H₂.

5. Q5easy

   What is the chemical name of common salt (table salt)?

   • Asodium chloride
   • Bcalcium carbonate
   • Csodium hydroxide
   • Dpotassium nitrate
   Show answer & solution

   Correct answer: (A) sodium chloride

   Common salt is sodium chloride, NaCl.

6. Q6easy

   Bases turn red litmus paper to which colour?

   • Ared
   • Bblue
   • Cgreen
   • Dyellow
   Show answer & solution

   Correct answer: (B) blue

   Bases turn red litmus BLUE.

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