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Assertion (A): Ammonia solution is an alkali.
Reason (R): Ammonia solution turns blue litmus paper red.
  • a)
    Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
  • b)
    Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
  • c)
    Assertion (A) is true but reason (R) is false.
  • d)
    Assertion (A) is false but reason (R) is true.
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
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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Community Answer
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 solution turns blue litmus paper red.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer? for Class 10 2025 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about Assertion (A): Ammonia solution is an alkali.Reason (R): Ammonia solution turns blue litmus paper red.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 10 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Assertion (A): Ammonia solution is an alkali.Reason (R): Ammonia solution turns blue litmus paper red.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer?.
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