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Chapter 10: Acids, Bases and Salts

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1

The pH of pure water at 25°C is:

A 0 B 5 C 7 D 14

2

Which substance is amphoteric?

A HCl B NaOH C Al(OH)₃ D NaCl

3

Ming is studying acidic oxides. He knows that acidic oxides react with bases to form salts and water. Which of the following is an acidic oxide?

A CaO B MgO C SO2 D Na2O

4

Which indicator turns pink in basic solution?

A Litmus B Methyl orange C Phenolphthalein D Universal indicator

5

Which acid is used in fertilizers?

A Hydrochloric acid B Sulfuric acid C Nitric acid D Acetic acid

6

Fatima is studying strong acids. She knows that strong acids completely ionize in water. Which of the following is a strong acid?

A HNO3 B H2CO3 C H3PO4 D CH3COOH

7

Rachel is studying the characteristic properties of acids. She knows that acids react with metals to produce hydrogen gas. What gas is produced when magnesium reacts with sulfuric acid?

A Oxygen B Hydrogen C Carbon dioxide D Sulfur dioxide

8

Emma is studying the Bronsted-Lowry concept. She knows that a base is a proton acceptor. In the reaction: H2O + NH3 → NH4+ + OH-, which species is the base?

A H2O B NH3 C NH4+ D OH-

9

Which salt is formed by weak acid and strong base?

A Neutral salt B Acidic salt C Basic salt D Complex salt

10

Yusuf is learning about alkalis. He knows that alkalis are soluble bases that release OH- ions in water. Which of the following is not an alkali?

A NaOH B KOH C Cu(OH)2 D Ca(OH)2