Assertion (A): Ammonia solution is an alkali.Reason (R): Ammonia solu...
Ammonia solution, which is alkaline, turns the red litmus paper blue.
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Assertion (A): Ammonia solution is an alkali.Reason (R): Ammonia solu...
Assertion and Reasoning
Assertion (A): Ammonia solution is an alkali.
Reason (R): Ammonia solution turns blue litmus paper red.
Explanation
An alkali is a basic substance that has a pH greater than 7. Ammonia solution is a basic substance that has a pH greater than 7, which makes it an alkali. Therefore, assertion (A) is true.
Litmus paper is a type of indicator used to determine whether a substance is acidic or basic. Blue litmus paper turns red in the presence of an acid, while red litmus paper turns blue in the presence of a base. When ammonia solution is placed on blue litmus paper, it turns the paper red, indicating that ammonia is a base. Therefore, reason (R) is also true.
However, the reason given does not explain why ammonia solution is an alkali. It only provides an example of how ammonia reacts with an acid-base indicator. Therefore, option (C) is the correct answer as assertion (A) is true but reason (R) is false.
Conclusion
In conclusion, ammonia solution is an alkali because it has a pH greater than 7. When ammonia solution is placed on blue litmus paper, it turns the paper red, indicating that it is a base. However, this does not explain why it is an alkali.
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