SEE (Secondary Education Examination, Nepal) · Science and Technology

Chemistry: matter, reactions and carbon compounds

23 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 23 questions

  1. What is the chemical formula of common salt?
  2. Which gas is released when zinc reacts with dilute hydrochloric acid?
  3. What is the atomic number of an atom that has 6 protons and 8 neutrons?
  4. What is the molar mass of water, H2O? (H = 1, O = 16)
  5. How many moles are present in 44 g of carbon dioxide, CO2? (C = 12, O = 16)
  6. What is the pH of a neutral solution at room temperature?
  7. Which of these is the product when an acid reacts with a base?
  8. Which metal is liquid at room temperature?
  9. What is the valency of aluminium?
  10. In the reaction N2 + 3H2 gives 2NH3, how many litres of ammonia form from 6 litres of hydrogen at the same temperature and pressure?
  11. Which gas is the main component of natural gas and biogas?
  12. What is the chemical name of baking soda?
  13. Which process is used to separate a mixture of two miscible liquids with different boiling points?
  14. How many atoms are present in one molecule of sulphuric acid, H2SO4?
  15. Which substance is commonly used to neutralise acidity in the stomach?
  16. Iron rusts when it is exposed to which two substances together?
  17. Which element is a non-metal that conducts electricity and is used in pencil leads?
  18. What is the chemical formula of washing soda?
  19. Which gas is produced when calcium carbide reacts with water?
  20. What is the name of the carbon compound CH3CH2OH?
  21. What is the general formula of the alkenes?
  22. What mass of calcium oxide forms when 50 g of calcium carbonate is heated strongly? (CaCO3 gives CaO + CO2; Ca = 40, C = 12, O = 16)
  23. Which of these metals is the most reactive?

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