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Acids, Bases and Salts

Telangana Board · Class 10 · Physical Sciences

Flashcards for Acids, Bases and Salts — Telangana Board Class 10 Physical Sciences. Quick Q&A cards covering key concepts, definitions, and formulas.

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45 Flashcards
Card 1Indicators

What is the colour of litmus in a neutral solution?

Answer

Litmus is purple in a neutral solution. It turns red in acids and blue in bases.

Card 2Indicators

Why does blue litmus turn red in an acid?

Answer

Acids produce hydronium ions in water. These ions change the colour of blue litmus to red, so litmus acts as an acid-base indicator.

Card 3Indicators

What are natural acid-base indicators?

Answer

Natural acid-base indicators are substances like litmus, red cabbage extract, turmeric solution, and coloured flower petal extracts. They change colour in acidic or basic solutions.

Card 4Indicators

How do phenolphthalein and methyl orange behave in acids and bases?

Answer

Phenolphthalein is colourless in acidic solution and pink in basic solution. Methyl orange is a synthetic indicator used to test acids and bases.

Card 5Indicators

Why are onion, vanilla essence, and clove oil called olfactory indicators?

Answer

Their smell changes in acidic or basic media. Indicators that show a change in odour are called olfactory indicators.

Card 6Reactions of acids

What happens when dilute hydrochloric acid reacts with zinc?

Answer

Hydrogen gas is evolved with a pop sound, and zinc chloride is formed. The reaction is: 2 HCl(aq) + Zn(s) → ZnCl2(aq) + H2(g).

Card 7Reactions of acids

Why is hydrogen gas usually formed when an acid reacts with a metal?

Answer

Acids react with metals to form a salt and hydrogen gas. The general reaction is: Acid + Metal → Salt + Hydrogen.

Card 8Reactions of bases

What happens when zinc reacts with sodium hydroxide solution?

Answer

Zinc reacts with sodium hydroxide to form sodium zincate and hydrogen gas. The reaction is: 2 NaOH(aq) + Zn(s) → Na2ZnO2(aq) + H2(g)↑.

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What are the important topics in Acids, Bases and Salts for Telangana Board Class 10 Physical Sciences?
Acids, Bases and Salts covers several key topics that are frequently asked in Telangana Board Class 10 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Acids, Bases and Salts — Telangana Board Class 10 Physical Sciences?
Understand the core concepts first, then work through the 43 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many flashcards are available for Acids, Bases and Salts?
There are 45 flashcards for Acids, Bases and Salts covering key definitions, formulas, and concepts. Use them daily for 10–15 minutes for best results.

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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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