1. Which term describes a systematic error in reasoning that can lead to an incorrect conclusion?
A) Cognitive bias or fallacy B) Molarity C) Catalyst D) Isotope
2. Confirmation bias is the tendency to:
A) Favor information that supports an existing belief B) Reject all experimental evidence C) Accept every new claim equally D) Change a conclusion after every observation
3. A hasty generalization occurs when a conclusion is based on:
A) Insufficient or unrepresentative evidence B) A large representative sample C) Repeated controlled experiments D) A valid mathematical proof
4. The post hoc fallacy incorrectly assumes that:
A) Because one event follows another, the first caused the second B) Two unrelated events must have different causes C) Every experiment has no uncertainty D) A conclusion must always be false
5. A straw man argument involves:
A) Misrepresenting an argument so it is easier to attack B) Providing stronger evidence for a claim C) Repeating an experiment independently D) Defining a chemical equation
6. Moving the goalposts means:
A) Changing the criteria for accepting evidence after the original criteria are met B) Using a standard procedure consistently C) Repeating a measurement D) Reporting an uncertainty
7. An appeal to tradition argues that a practice is correct mainly because:
A) It has been done traditionally B) It has been experimentally tested C) It has a measured uncertainty D) It follows a chemical equation
8. An appeal to false authority occurs when someone:
A) Uses an unqualified person as evidence for a scientific claim B) Uses peer-reviewed evidence C) Reports experimental data D) Compares two valid hypotheses
9. Occam’s Razor generally favors:
A) The simplest adequate explanation B) The most complicated explanation C) The oldest explanation D) An explanation with no evidence
10. An argument from a non-testable hypothesis is scientifically weak because the hypothesis:
A) Cannot be tested against evidence B) Always uses mathematics C) Contains a chemical symbol D) Has been repeated many times
11. Begging the question occurs when:
A) The conclusion is assumed in the reasoning used to support it B) A conclusion is supported by independent evidence C) A variable is controlled D) An experiment is repeated
12. The fallacy of exclusion can occur when an argument:
A) Ignores relevant evidence or alternatives B) Includes all relevant evidence C) Uses a control group D) Reports negative results
13. A faulty analogy results when:
A) Two things are treated as similar in a relevant way when they are not B) Two identical samples are compared C) A measurement is repeated D) A hypothesis is experimentally tested
14. Which practice best helps reduce confirmation bias in scientific research?
A) Considering evidence that could contradict the hypothesis B) Ignoring unexpected results C) Selecting only favorable data D) Avoiding independent review
15. A scientist should change a conclusion when:
A) Reliable evidence contradicts the original conclusion B) A colleague disagrees without evidence C) The result is inconvenient D) The experiment is difficult
16. Scientific reasoning should be based primarily on:
A) Evidence, logical reasoning and testable explanations B) Personal preference C) Tradition alone D) Popularity of an idea
17. Which is an example of a scientific claim?
A) Increasing temperature increases the rate of this reaction under specified conditions B) Chemistry is interesting C) This laboratory looks clean D) I prefer this experiment
18. A counterclaim is:
A) A claim that challenges or provides an alternative to the original claim B) A chemical equation C) A measurement unit D) A laboratory apparatus
19. A rebuttal is used to:
A) Respond to and address a counterclaim B) Define an atom C) Measure temperature D) Balance an equation
20. A premise is:
A) A statement offered as a reason or basis for a conclusion B) The final product of a reaction C) A unit of pressure D) A type of chemical bond
21. A conclusion in a scientific argument is:
A) The statement supported by the premises and evidence B) The first measurement taken C) A laboratory safety rule D) A chemical reagent
22. An assumption is:
A) A statement accepted for the purpose of reasoning without being established by the argument itself B) A measured experimental value C) A confirmed law in every case D) A unit conversion
23. Which sequence best represents a simple scientific argument?
A) Evidence/premises → reasoning → conclusion B) Conclusion → no evidence → premise C) Assumption → answer → experiment only D) Result → tradition → claim
24. A scientific argument is stronger when its claims are supported by:
A) Relevant and reliable evidence B) Personal opinions C) Anonymous rumors D) Unsupported assertions
25. Peer review can help scientific work by:
A) Allowing other specialists to evaluate methods and evidence B) Guaranteeing that every result is correct C) Removing the need for experiments D) Preventing disagreement
26. Reproducibility is important because it helps show that:
A) Results can be obtained by others using appropriate independent methods or conditions B) Only one scientist can obtain the result C) A result is always exact D) No uncertainty exists
27. Ethics in chemistry concerns:
A) Responsible choices about the production, use and consequences of chemical substances and processes B) Only naming chemical compounds C) Only balancing equations D) Only laboratory glassware
28. One ethical concern in producing a chemical substance is its potential effect on:
A) Human health and the environment B) The alphabet C) The periodic table’s layout D) The spelling of its name
29. A chemical company has an ethical responsibility to:
A) Consider safety, environmental effects and truthful communication B) Hide known hazards C) Ignore regulations D) Publish only favorable information
30. Regulations concerning chemicals are intended in part to:
A) Protect people and the environment and control risks B) Prevent all chemical research C) Eliminate all industrial production D) Make every chemical harmless
31. Which is an example of an environmental ethical issue?
A) Release of a toxic chemical into a river B) Correct labeling of a reagent C) Using a clean beaker D) Recording a measurement
32. Which action demonstrates responsible chemical practice?
A) Properly treating hazardous waste before disposal B) Pouring toxic waste into a drain C) Ignoring a spill D) Removing hazard labels
33. Risk assessment in chemistry involves considering:
A) The likelihood and consequences of potential harm B) Only the color of a substance C) Only its market price D) Only its melting point
34. The principle of precaution encourages decision-makers to:
A) Consider possible serious harm even when scientific uncertainty remains B) Ignore all uncertain risks C) Assume every chemical is harmless D) Stop all scientific investigation
35. Which situation presents an ethical conflict?
A) A useful chemical process also creates significant environmental pollution B) A reaction is balanced C) A sample is labeled D) A thermometer is calibrated
36. A balanced ethical assessment should consider:
A) Benefits, risks, affected people and environmental consequences B) Only financial profit C) Only production speed D) Only public opinion
37. Green chemistry aims to:
A) Reduce or eliminate hazardous substances and waste in chemical processes B) Increase hazardous waste C) Use more toxic reagents D) Avoid all chemical reactions
38. Which approach is most consistent with green chemistry?
A) Designing a process that produces less hazardous waste B) Using excess toxic reagents unnecessarily C) Disposing of waste without treatment D) Maximizing by-products
39. A claim that a product is ‘completely safe’ without adequate evidence is problematic because it:
A) May overstate what the evidence supports B) Always represents a measured fact C) Is automatically peer reviewed D) Cannot influence consumers
40. When evaluating a scientific advertisement, a student should ask:
A) What evidence supports the claim and how reliable is it? B) Who has the most attractive advertisement? C) Is the product expensive? D) Is the claim popular?
41. Which statement is an example of a testable scientific claim?
A) This catalyst increases reaction rate under specified conditions B) This chemical is the best in the world C) Nature prefers this reaction D) This method is obviously superior
42. A good scientific conclusion should:
A) Follow logically from the available evidence B) Ignore contradictory observations C) Depend only on authority D) Be decided before data collection
43. Why should scientists disclose relevant conflicts of interest?
A) To help readers judge the context and possible influences on the work B) To make experiments unnecessary C) To guarantee the conclusion is correct D) To replace peer review
44. Which practice improves transparency in scientific research?
A) Clearly reporting methods, data limitations and uncertainties B) Reporting only successful trials C) Hiding unexpected results D) Changing data to fit a hypothesis
45. Which is an example of faulty reasoning by false cause?
A) Claiming a new laboratory light caused higher marks simply because it was installed before the test B) Testing the effect of light with controlled groups C) Repeating an experiment D) Comparing measured reaction rates
46. Which statement best distinguishes evidence from an opinion?
A) Evidence is information that can be examined to support or challenge a claim B) An opinion is always experimentally proven C) Evidence is based only on popularity D) Opinions cannot ever be changed
47. Why are counterclaims useful in scientific argument?
A) They help test the strength and limitations of an explanation B) They eliminate the need for evidence C) They prove the original claim automatically D) They prevent scientific debate
48. Which action best reflects scientific integrity?
A) Reporting results honestly, including results that do not support the hypothesis B) Selecting only convenient measurements C) Inventing missing observations D) Hiding experimental failures
49. When a chemical product has both benefits and risks, an ethical decision should:
A) Compare the benefits with potential harms and consider ways to reduce the risks B) Ignore the harms C) Ignore the benefits D) Assume regulation is unnecessary
50. Which statement best summarizes the role of ethics and values in chemistry?
A) They help scientists and organizations make responsible decisions about evidence, safety, health and environmental consequences B) They replace experimental evidence C) They prevent innovation D) They apply only to school laboratories
These MCQs are prepared with reference to the FBISE HSSC-II Chemistry Assessment Framework and the National Curriculum of Pakistan 2022–23. This chapter covers C-12-A-01 (cognitive biases and fallacies), C-12-A-02 (ethical considerations in the production and use of chemical substances and processes), and C-12-A-03 (deconstructing scientific arguments using claims, counterclaims, rebuttals, premises, conclusions and assumptions).
The chapter is included as a learning resource because these concepts support sound scientific reasoning, responsible chemistry and broader academic preparation.