EASY
Earn 100

In acidic conditions, blue litmus turns to red in colour.

50% studentsanswered this correctly

Important Questions on Acids, Bases and Salts

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Vankarbhaibhas explained the definition of an acid and a base, given by Robert Boyle in the classroom. Then the students of the classroom gave some suggestions regarding acid and base. Which suggestion is wrong among these?

Prashant: Acids are sour in taste and bases are bitter.

Dhruvi: Acid does not give any effect on wet blue litmus paper while base turns blue litmus paper blue.

Seil: Acid liberates dry hydrogen gas (H2) by the reaction with the metal. The base does not react with all metals.

Jaydeep: By neutralisation reaction between acid and base, salt and water is produced.

 

 

MEDIUM
You have been provided with three test tubes. One of them contains distilled water and the other two contains an acidic solution and basic solution respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?
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Pratyush took sulphur powder on a spatula and heated it. He collected the evolved by inverting a test tube over it. What will be the action of gas on the following?

Moist litmus paper.

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Which of the following phenomena occur, when a small amount of acid is added to water?
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An indicator is added to Potassium Hydroxide and the solution turns pink:

Name the indicator that is added.

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A solution turns red litmus blue. Its pH is likely to be
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Pratyush took sulphur powder on a spatula and heated it. He collected the evolved by inverting a test tube over it. What will be the action of gas on the following?

Dry litmus paper.

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An aqueous solution turns red litmus blue. Excess addition of which of the following solutions would reverse the change? 
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Which acid is present in each of the following? 

(a) Sour milk (b) Tamarind (c) Orange.

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What is the natural source of tartaric acid? 
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Which of the following is a Bronsted-Lowry acid ?
HARD

The salt solution which does not react with ammonium hydroxide is:

MEDIUM
 Give any two uses of ethanoic acid.
HARD
There is no change in the colour of red litmus and blue litmus paper when introduced into an aqueous solution of sodium chloride. After passing direct current through the same solution, red litmus changes to blue colour. Which product is responsible for this change ? Mention any two uses of this product.
 
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Name the natural sources of (i) acetic acid and (ii) uric acid.
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One of the following is not an organic acid.This is 
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Name the element which is common to all acids? 
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Name the acid present in sour milk.
MEDIUM

An indicator is added to Potassium Hydroxide and the solution turns pink:

What is the colour change you will observe if you add litmus to the same solution?

MEDIUM
Which of the following is a dibasic acid?