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CBSE
Class 7
Science
Curiosity
Exploring Substances: Acidic, ...
Question Bank

Question Bank - Exploring Subs...

Practice Hub

Question Bank: Exploring Substances: Acidic, Basic, and Neutral

Structured practice

Question Bank - Exploring Substances: Acidic, Basic, and Neutral

Q1.

What is the pH of a neutral solution?

Single Answer MCQ
Q-00127435
View explanation
Q2.

Which of the following substances is acidic?

Single Answer MCQ
Q-00127437
View explanation
Q3.

What color does blue litmus paper turn when dipped in an acidic solution?

Single Answer MCQ
Q-00127439
View explanation
Q4.

What can be inferred if red litmus paper remains red when dipped in a solution?

Single Answer MCQ
Q-00127441
View explanation
Q5.

If a substance turns red litmus paper blue, what type of substance is it?

Single Answer MCQ
Q-00127442
View explanation
Q6.

What color change would you expect when lemon juice is added to blue litmus paper?

Single Answer MCQ
Q-00127443
View explanation
Q7.

Which substance can act as a neutralizer for acids?

Single Answer MCQ
Q-00127444
View explanation
Q8.

How is lime water prepared?

Single Answer MCQ
Q-00127445
View explanation
Q9.

When you mix equal parts of an acid and a base, what is likely to happen?

Single Answer MCQ
Q-00127446
View explanation
Q10.

Which of the following is a property of bases?

Single Answer MCQ
Q-00127447
View explanation
Q11.

What happens to the pH of a solution when an acid is added?

Single Answer MCQ
Q-00127448
View explanation
Q12.

Which of the following is a strong acid?

Single Answer MCQ
Q-00127449
View explanation
Q13.

How does soap affect the pH of water?

Single Answer MCQ
Q-00127450
View explanation
Q14.

Which substance is commonly used to test acidity?

Single Answer MCQ
Q-00127451
View explanation
Q15.

What is a common misconception about acid-base reactions?

Single Answer MCQ
Q-00127452
View explanation
Q16.

Why do we use pH indicators in experiments?

Single Answer MCQ
Q-00127453
View explanation
Q17.

What color does blue litmus paper turn in an acidic solution?

Single Answer MCQ
Q-00127454
View explanation
Q18.

In which of the following solutions would you expect blue litmus paper to remain unchanged?

Single Answer MCQ
Q-00127455
View explanation
Q19.

What does the term 'indicator' refer to in the context of litmus paper?

Single Answer MCQ
Q-00127456
View explanation
Q20.

What color change occurs when red litmus paper is placed in a basic solution?

Single Answer MCQ
Q-00127457
View explanation
Q21.

Which of the following substances will not change the color of blue litmus paper?

Single Answer MCQ
Q-00127458
View explanation
Q22.

Which of the following solutions is most likely to turn red litmus paper blue?

Single Answer MCQ
Q-00127459
View explanation
Q23.

What is the primary purpose of using litmus paper in experiments?

Single Answer MCQ
Q-00127460
View explanation
Q24.

What happens to the color of litmus paper if a neutral solution is added?

Single Answer MCQ
Q-00127461
View explanation
Q25.

Which experiment would best demonstrate the use of litmus paper?

Single Answer MCQ
Q-00127462
View explanation
Q26.

If a student accidentally uses a blue litmus paper in an acidic solution, what color will they observe?

Single Answer MCQ
Q-00127463
View explanation
Q27.

What color does a red rose indicator turn in acidic solutions?

Single Answer MCQ
Q-00127464
View explanation
Q28.

What substance could be tested using litmus paper to confirm it is basic?

Single Answer MCQ
Q-00127465
View explanation
Q29.

What does it mean if a red rose indicator turns blue when used in a solution?

Single Answer MCQ
Q-00127466
View explanation
Q30.

What is the chemical nature of the solution that changes blue litmus to red?

Single Answer MCQ
Q-00127467
View explanation
Q31.

Which of the following substances would likely turn a red rose indicator to its neutral color?

Single Answer MCQ
Q-00127468
View explanation
Q32.

Why might a chemist choose litmus paper over other indicators?

Single Answer MCQ
Q-00127469
View explanation
Q33.

How can red roses be used to test for acids or bases?

Single Answer MCQ
Q-00127470
View explanation
Q34.

Which pH range corresponds to acidic solutions?

Single Answer MCQ
Q-00127471
View explanation
Q35.

Which of the following correctly describes the behavior of red roses in neutral solutions?

Single Answer MCQ
Q-00127472
View explanation
Q36.

What color would a litmus paper show if it is neutral?

Single Answer MCQ
Q-00127473
View explanation
Q37.

If a red rose indicator turns purple, what does this suggest about the solution tested?

Single Answer MCQ
Q-00127474
View explanation
Q38.

What is the main principle behind using red roses as an indicator in scientific experiments?

Single Answer MCQ
Q-00127475
View explanation
Q39.

What type of chemical change occurs when red roses are immersed in acidic solutions?

Single Answer MCQ
Q-00127476
View explanation
Q40.

Which of the following is most likely to turn a red rose indicator blue?

Single Answer MCQ
Q-00127477
View explanation
Q41.

Why should you not use red rose indicators with complex mixtures?

Single Answer MCQ
Q-00127478
View explanation
Q42.

How does temperature affect the results when using a red rose as an indicator?

Single Answer MCQ
Q-00127479
View explanation
Q43.

What does a consistent red color in red rose indicators across various samples suggest?

Single Answer MCQ
Q-00127480
View explanation
Q44.

In which scenario would a red rose indicator yield inconclusive results?

Single Answer MCQ
Q-00127481
View explanation
Q45.

What could cause a misinterpretation of results when using the red rose as an indicator?

Single Answer MCQ
Q-00127482
View explanation
Q46.

What is the result of mixing an acid with a base?

Single Answer MCQ
Q-00127483
View explanation
Q47.

Which of the following indicates that a substance is acidic?

Single Answer MCQ
Q-00127484
View explanation
Q48.

What type of reaction occurs when vinegar (an acid) is mixed with baking soda (a base)?

Single Answer MCQ
Q-00127485
View explanation
Q49.

Which of the following is a common indicator used to test pH?

Single Answer MCQ
Q-00127486
View explanation
Q50.

What happens when a strong acid is mixed with a weak base?

Single Answer MCQ
Q-00127487
View explanation
Q51.

Which of the following describes a neutral substance?

Single Answer MCQ
Q-00127488
View explanation
Q52.

What gas is typically produced when an acid reacts with a carbonate?

Single Answer MCQ
Q-00127489
View explanation
Q53.

What is the pH range of acidic solutions?

Single Answer MCQ
Q-00127490
View explanation
Q54.

In which scenario do you expect fizzing to occur?

Single Answer MCQ
Q-00127491
View explanation
Q55.

Which is a property of bases?

Single Answer MCQ
Q-00127492
View explanation
Q56.

If hydrochloric acid is mixed with sodium hydroxide, what is the expected result?

Single Answer MCQ
Q-00127493
View explanation
Q57.

What safety precautions should one take when mixing acids and bases?

Single Answer MCQ
Q-00127494
View explanation
Q58.

What does the term 'neutralization' refer to in chemistry?

Single Answer MCQ
Q-00127495
View explanation
Q59.

What happens to phenolphthalein indicator when added to a basic solution?

Single Answer MCQ
Q-00127496
View explanation
Q60.

What color does turmeric turn in acidic solutions?

Single Answer MCQ
Q-00127497
View explanation
Q61.

Which property of turmeric makes it useful as an indicator?

Single Answer MCQ
Q-00127498
View explanation
Q62.

In which type of solution does turmeric remain yellow?

Single Answer MCQ
Q-00127499
View explanation
Q63.

Turmeric is derived from which part of the plant?

Single Answer MCQ
Q-00127500
View explanation
Q64.

When turmeric is mixed with soap solution, what color is observed?

Single Answer MCQ
Q-00127501
View explanation
Q65.

How can you test if a solution is acidic using turmeric?

Single Answer MCQ
Q-00127502
View explanation
Q66.

What happens when turmeric is added to a vinegar solution?

Single Answer MCQ
Q-00127503
View explanation
Q67.

Turmeric can indicate which type of substances?

Single Answer MCQ
Q-00127504
View explanation
Q68.

What is the pH range where turmeric changes color?

Single Answer MCQ
Q-00127505
View explanation
Q69.

Which of the following is a common mistake when using turmeric as an indicator?

Single Answer MCQ
Q-00127506
View explanation
Q70.

If turmeric is placed in a carbonated drink, what would you expect to happen?

Single Answer MCQ
Q-00127507
View explanation
Q71.

What would be a potential limitation of using turmeric as an acid-base indicator?

Single Answer MCQ
Q-00127508
View explanation
Q72.

What reaction occurs when turmeric is exposed to a strong acid?

Single Answer MCQ
Q-00127509
View explanation
Q73.

Why is turmeric considered a natural indicator?

Single Answer MCQ
Q-00127510
View explanation
Q74.

What is the result of neutralization between an acid and a base?

Single Answer MCQ
Q-00127511
View explanation
Q75.

Which substance would you use to neutralize an acid spill?

Single Answer MCQ
Q-00127512
View explanation
Q76.

Neutralization is a reaction between which types of substances?

Single Answer MCQ
Q-00127513
View explanation
Q77.

What color does red litmus paper turn when dipped in a basic solution?

Single Answer MCQ
Q-00127514
View explanation
Q78.

In what common household product can you find an acidic solution?

Single Answer MCQ
Q-00127515
View explanation
Q79.

What is formed when hydrochloric acid reacts with sodium hydroxide?

Single Answer MCQ
Q-00127516
View explanation
Q80.

Why is neutralization important in our digestive system?

Single Answer MCQ
Q-00127517
View explanation
Q81.

Which of the following indicators turns yellow in acidic solutions?

Single Answer MCQ
Q-00127518
View explanation
Q82.

What happens when baking soda is added to vinegar?

Single Answer MCQ
Q-00127519
View explanation
Q83.

Which of the following is an example of a neutral substance?

Single Answer MCQ
Q-00127520
View explanation
Q84.

How can baking soda be useful in households concerning spills?

Single Answer MCQ
Q-00127521
View explanation
Q85.

What could happen if you accidentally mix bleach with vinegar?

Single Answer MCQ
Q-00127522
View explanation
Q86.

What type of chemical reaction is neutralization considered?

Single Answer MCQ
Q-00127523
View explanation
Q87.

In the context of neutralization, what is the role of an acid?

Single Answer MCQ
Q-00127524
View explanation
Q88.

Which of the following can be a product of a neutralization reaction?

Single Answer MCQ
Q-00127525
View explanation
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