CBSE CLASS 10 SCIENCE

Acids, Bases and Salts Important Questions

Syllabus-aligned Acids, Bases and Salts questions with clear answers, explanations and application-focused practice for CBSE Class 10 Science.

pH in everyday lifeChemical reactions of salts

Questions

Chapter

Acids, Bases and Salts

Resource

Important Questions

1Acids, Bases and Saltscase-study

A student has frequent tooth decay after consuming sugary food. Explain the role of pH and why toothpaste is generally basic.

Answer

Bacteria produce acids that lower the pH of the mouth below about $5.5$ . Basic toothpaste helps neutralise these acids.

Solution

Tooth enamel begins to dissolve in an acidic medium. Brushing removes food particles and the basic nature of toothpaste helps restore a safer pH.

2Acids, Bases and Saltsshort-answer

Answer

$2 N a H C O_{3} Δ N a_{2} C O_{3} + H_{2} O + C O_{2}$ . Carbon dioxide is released.

Solution

On heating, sodium hydrogen carbonate decomposes into sodium carbonate, water and carbon dioxide. The carbon dioxide can turn limewater milky.

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CBSE CLASS 10 SCIENCE

Syllabus-aligned Acids, Bases and Salts questions with clear answers, explanations and application-focused practice for CBSE Class 10 Science.

pH in everyday lifeChemical reactions of salts

Questions

Chapter

Acids, Bases and Salts

Resource

Important Questions

1Acids, Bases and Saltscase-study

Answer

Bacteria produce acids that lower the pH of the mouth below about $5.5$ . Basic toothpaste helps neutralise these acids.

Solution

Tooth enamel begins to dissolve in an acidic medium. Brushing removes food particles and the basic nature of toothpaste helps restore a safer pH.

2Acids, Bases and Saltsshort-answer

Answer

$2 N a H C O_{3} Δ N a_{2} C O_{3} + H_{2} O + C O_{2}$ . Carbon dioxide is released.

Solution

On heating, sodium hydrogen carbonate decomposes into sodium carbonate, water and carbon dioxide. The carbon dioxide can turn limewater milky.