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Q1. A student tests aerated water with litmus paper. What change will he observe on the blue litmus paper?
Aerated water contains carbon dioxide dissolved in it, which forms carbonic acid. Being acidic, it turns blue litmus paper red. It does not turn green, show no change, or turn blue.
Q2. Aerated water is tested with both red and blue litmus papers. What is the correct observation?
Aerated water is acidic. Acids turn blue litmus red, but they do not change the color of red litmus (red litmus remains red). Therefore, red litmus shows no change, and blue litmus turns red.
Q3. What can be inferred about the nature of aerated water based on its effect on litmus paper?
Since aerated water turns blue litmus paper red, it is acidic in nature. Basic solutions turn red litmus blue, neutral solutions have no effect on litmus paper, and salty is not a nature classification.
Q4. Common salt solution is tested with litmus paper. What will be the result on blue litmus paper?
Common salt solution is neutral. It does not change the color of either red or blue litmus paper. Blue litmus remains blue, and red litmus remains red. Neutral solutions have no effect on litmus paper.
Q5. A student dips both red and blue litmus papers in a beaker containing common salt solution. What will he observe?
Common salt solution is neutral. Neutral solutions do not change the color of either red or blue litmus paper. Both litmus papers will show no change, remaining their original colors.
Q6. What is the nature of common salt solution as indicated by the litmus test?
Since common salt solution does not change the color of either red or blue litmus paper, it is neutral. Acids and bases change litmus paper colors, but neutral substances do not affect litmus.
Q7. Shampoo solution is tested with red litmus paper. What change will be observed?
Shampoo is generally basic. Basic solutions turn red litmus paper blue. Shampoo solution will turn red litmus blue, indicating its basic nature.
Q8. A student tests shampoo solution with both red and blue litmus papers. What will be his observation?
Shampoo is basic. It turns red litmus blue. Blue litmus paper remains blue in a basic solution (shows no change). Therefore, red litmus turns blue, and blue litmus shows no change.
Q9. Based on the litmus test, what can be inferred about the nature of shampoo solution?
Since shampoo turns red litmus paper blue, it is basic in nature. Acids turn blue litmus red, neutral substances have no effect, and salty is not a nature classification.
Q10. Baking soda solution is tested with blue litmus paper. What change will occur?
Baking soda solution is basic. Basic solutions do not change the color of blue litmus paper; it remains blue. Red litmus turns blue in basic solutions. Therefore, blue litmus shows no change.
Q11. A student places a drop of baking soda solution on red litmus paper. What will he observe?
Baking soda solution is basic. Basic solutions turn red litmus paper blue. Therefore, the red litmus paper will turn blue, indicating the basic nature of baking soda.
Q12. What is the nature of baking soda solution as shown by the litmus test?
Baking soda solution turns red litmus blue, indicating that it is basic in nature. Acids turn blue litmus red, neutral substances have no effect, and sour is a taste characteristic of acids.
Q13. Lemon juice is tested with red litmus paper. What will be the result?
Lemon juice is acidic. Acids do not change the color of red litmus paper; red litmus remains red. Blue litmus turns red in acids. Therefore, red litmus shows no change.
Q14. A student tests lemon juice with blue litmus paper. What change will he observe?
Lemon juice is acidic. Acids turn blue litmus paper red. Therefore, lemon juice will turn blue litmus red, confirming its acidic nature.
Q15. What inference can be drawn from the litmus test on lemon juice?
Since lemon juice turns blue litmus paper red, it is acidic. Basic solutions turn red litmus blue, neutral solutions have no effect, and soapy is a characteristic of bases.
Q16. Hydrochloric acid solution is a strong mineral acid. What will be its effect on blue litmus paper?
Hydrochloric acid is acidic. Acids turn blue litmus paper red. Therefore, hydrochloric acid will turn blue litmus red, indicating its acidic nature.
Q17. A student tests hydrochloric acid with both red and blue litmus papers. What will he observe?
Hydrochloric acid is acidic. Acids turn blue litmus red, but they do not change red litmus. Therefore, red litmus shows no change, and blue litmus turns red.
Q18. Based on the litmus test, what is the nature of hydrochloric acid solution?
Since hydrochloric acid turns blue litmus red, it is acidic in nature. Basic solutions turn red litmus blue, neutral solutions have no effect, and salty is not a nature classification.
Q19. Nitric acid is another strong mineral acid. What will be its effect on red litmus paper?
Nitric acid is acidic. Acids do not change the color of red litmus paper; red litmus remains red. Only bases turn red litmus blue. Therefore, nitric acid has no effect on red litmus.
Q20. A student performs a litmus test on nitric acid solution. What will he observe on the blue litmus paper?
Nitric acid is acidic. Acids turn blue litmus paper red. Therefore, nitric acid will turn blue litmus red, indicating its acidic nature.
Q21. What inference can be made about nitric acid from the litmus paper test?
Since nitric acid turns blue litmus red, it is acidic. Basic solutions turn red litmus blue, neutral solutions have no effect, and soapy is a characteristic of bases.
Q22. Washing soda solution is commonly used as a cleaning agent. What will be its effect on red litmus paper?
Washing soda is basic. Basic solutions turn red litmus paper blue. Therefore, washing soda solution will turn red litmus blue.
Q23. A student tests washing soda solution with both red and blue litmus papers. What will he observe?
Washing soda is basic. It turns red litmus blue. Blue litmus paper remains blue in a basic solution (shows no change). Therefore, red litmus turns blue, and blue litmus shows no change.
Q24. Based on the litmus test, what is the nature of washing soda solution?
Since washing soda turns red litmus blue, it is basic in nature. Acids turn blue litmus red, neutral substances have no effect, and sour is a characteristic of acids.
Q25. Limewater is used to test for carbon dioxide gas. What will be its effect on blue litmus paper?
Limewater is a basic solution (calcium hydroxide). Basic solutions do not change the color of blue litmus paper; it remains blue. Red litmus turns blue in basic solutions.
Q26. A student dips red litmus paper into a beaker of limewater. What will he observe?
Limewater is basic. Basic solutions turn red litmus paper blue. Therefore, the red litmus paper will turn blue, indicating the basic nature of limewater.
Q27. What can be inferred about the nature of limewater from its effect on litmus paper?
Since limewater turns red litmus blue, it is basic in nature. Acids turn blue litmus red, neutral substances have no effect, and sour is a characteristic of acids.
Q28. Which of the following solutions will turn blue litmus paper red?
Lemon juice is acidic and turns blue litmus red. Soap solution, limewater, and baking soda are basic and would not turn blue litmus red (they would turn red litmus blue).
Q29. Which of the following solutions will turn red litmus paper blue?
Shampoo is basic and turns red litmus blue. Vinegar, lemon juice, and aerated water are acidic and would not turn red litmus blue (they would turn blue litmus red).
Q30. A solution has no effect on either red or blue litmus paper. Which of the following could it be?
Common salt solution is neutral and has no effect on either red or blue litmus paper. Lemon juice and vinegar are acidic, and washing soda solution is basic. Neutral solutions do not change litmus colors.
Q31. Four solutions are tested with litmus paper. Which one is most likely to be aerated water?
Aerated water is acidic. It turns blue litmus red and has no effect on red litmus. Turning red litmus blue would indicate a base, no change on either indicates neutral, and turning both green is not a litmus reaction.
Q32. Four solutions are tested with litmus paper. Which one is most likely to be shampoo solution?
Shampoo is basic. It turns red litmus blue and has no change on blue litmus. Turning blue litmus red would indicate an acid, no change on either indicates neutral, and turning both red is not a litmus reaction.
Q33. A liquid ‘X’ is tested with litmus paper. Red litmus turns blue, but blue litmus shows no change. What is the nature of liquid ‘X’?
When red litmus turns blue and blue litmus shows no change, the solution is basic. Bases turn red litmus blue and do not affect blue litmus. Acids turn blue litmus red.
Q34. A liquid ‘Y’ is tested with litmus paper. Blue litmus turns red, but red litmus shows no change. What is the nature of liquid ‘Y’?
When blue litmus turns red and red litmus shows no change, the solution is acidic. Acids turn blue litmus red and do not affect red litmus. Bases turn red litmus blue.
Q35. A liquid ‘Z’ is tested with litmus paper and shows no change on either red or blue litmus. What is the nature of liquid ‘Z’?
When neither red nor blue litmus changes color, the solution is neutral. Acids turn blue litmus red, and bases turn red litmus blue. Neutral solutions do not affect litmus paper.
Q36. Which of the following is a pair of acidic solutions based on their effect on litmus?
Aerated water and lemon juice are both acidic. They turn blue litmus red. Limewater, soap, baking soda, washing soda, and shampoo are basic. Common salt is neutral.
Q37. Which of the following is a pair of basic solutions based on their effect on litmus?
Shampoo and limewater are both basic. They turn red litmus blue. Vinegar, lemon juice, aerated water, and hydrochloric acid are acidic. Common salt and sugar are neutral.
Q38. A student has four unlabeled beakers containing aerated water, common salt solution, shampoo, and lemon juice. How can he identify the beaker with common salt solution using only litmus paper?
Common salt solution is neutral. It will not change the color of either red or blue litmus paper. Aerated water and lemon juice are acidic (turn blue litmus red), and shampoo is basic (turns red litmus blue).
Q39. A student finds that a solution turns blue litmus red. Which of the following could the solution NOT be?
Limewater is basic and would not turn blue litmus red; it would turn red litmus blue. Lemon juice, vinegar, and hydrochloric acid are all acidic and would turn blue litmus red.
Q40. A student finds that a solution turns red litmus blue. Which of the following could the solution NOT be?
Aerated water is acidic and would not turn red litmus blue; it would turn blue litmus red. Soap, washing soda, and baking soda are all basic and would turn red litmus blue.
Q41. You are given three solutions: P, Q, and R. P turns blue litmus red. Q turns red litmus blue. R shows no change on either litmus. Which option correctly identifies P, Q, and R?
P turns blue litmus red → acidic. Q turns red litmus blue → basic. R shows no change on either litmus → neutral. Therefore, P is acid, Q is base, and R is neutral.
Q42. Which of the following statements about nitric acid is correct based on its litmus test?
Nitric acid is acidic. Acids turn blue litmus red and have no effect on red litmus. Turning red litmus blue would indicate a base, and turning both red is not a litmus reaction.
Q43. Which of the following statements about washing soda solution is correct based on its litmus test?
Washing soda is basic. Bases turn red litmus blue and have no effect on blue litmus. It is not acidic, neutral, and does not turn both litmus papers blue.
Q44. If you accidentally mix an acid and a base, the resulting solution might show what litmus test result?
When an acid and a base are mixed, they neutralise each other. If exactly equal amounts are mixed, the resulting solution may be neutral and show no change on either litmus paper. It will not turn both green.
Q45. Hydrochloric acid and nitric acid are both strong acids. How will their effect on litmus paper compare?
Both hydrochloric acid and nitric acid are acids. All acids turn blue litmus red and have no effect on red litmus. Their effect on litmus paper is the same.
Q46. Baking soda solution and washing soda solution are both basic. How will their effect on red litmus paper compare?
Both baking soda and washing soda are basic. All basic solutions turn red litmus paper blue. Therefore, both will have the same effect on red litmus.
Q47. A solution is known to be either limewater or lemon juice. A single drop on red litmus paper will help identify it. How?
Limewater is basic and turns red litmus blue. Lemon juice is acidic and does not change red litmus (red litmus remains red). Therefore, if red litmus turns blue, it is limewater.
Q48. A solution is known to be either aerated water or common salt solution. Testing it with blue litmus paper will reveal its identity. How?
Aerated water is acidic and turns blue litmus red. Common salt solution is neutral and does not change blue litmus. Therefore, if blue litmus turns red, it is aerated water.
Q49. A teacher showed that shampoos are generally basic. If a particular brand of shampoo were acidic, how would its litmus test result differ?
Basic shampoos turn red litmus blue and have no effect on blue litmus. If a shampoo were acidic, it would turn blue litmus red and have no effect on red litmus. So, it would turn blue litmus red.
Q50. Based on the provided data, which of the following conclusions is correct?
Red litmus does not change in acidic solutions (it stays red) and also does not change in neutral solutions. Therefore, a substance that does not change red litmus could be either acidic or neutral. Only bases change red litmus to blue.