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Inorganic Chemistry MSQ Questions : Grade 11 Unit 1 : PNG

03 February , , , , , , , , ,
Students in Papua New Guinea must answer these questions because they are carefully designed to build a strong foundation in chemistry by helping learners clearly distinguish between pure and impure substances and understand how physical state and chemical composition determine the properties of matter. Working through these questions strengthens critical thinking, improves scientific vocabulary, and reinforces key concepts that are frequently tested in Grade 11 national examinations. Regular practice with structured multiple-choice questions also develops exam confidence, accuracy, and time-management skills, enabling students to identify patterns in questions, avoid common misconceptions, and apply theory to real-life examples relevant to PNG. Ultimately, mastering these questions equips students with the conceptual understanding and exam readiness needed to succeed in chemistry and progress confidently into higher-level science studies.
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1. Which statement best describes a pure substance?




2. Water obtained directly from a river is considered an impure substance mainly because it:




3. A substance that melts at exactly 801°C under standard conditions is most likely:




4. Which of the following is an example of a pure element?




5. The presence of impurities in a substance usually causes its melting point to:




6. Salt mixed with sand is classified as an impure substance because it:




7. Which method is most suitable for separating an insoluble impurity from a liquid?




8. “This substance conducts electricity only when molten.” This property is most related to its:




9. Which property depends mainly on the physical state of a substance?




10. Air is considered an impure substance because it:




11. A pure substance can be identified by its:




12. Which of the following is a physical change related to state of matter?




13. The hardness of a substance is mainly influenced by its:




14. Which option correctly matches a substance with its classification?




15. An impure substance differs from a pure substance because it:




16. A substance exists as a gas at room temperature mainly due to:




17. Which property is a consequence of chemical composition rather than physical state?




18. “This solid is brittle and shatters when hit.” This property is best described as:




19. Which of the following substances is impure but uniform throughout?




20. The boiling point of an impure liquid usually:




21. Which factor most affects whether a substance is solid, liquid, or gas?




22. A mixture can be distinguished from a pure substance because a mixture:




23. The ability of copper to conduct electricity is mainly due to its:




24. Which process shows that a substance is impure?




25. A substance that keeps its volume but changes its shape is most likely a:




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