Common Entrance Chemistry – 30 Multiple choice questions

1. What is the pH value of pure water?
 
 
 
 
2. When clothes dry the water is
 
 
 
 
3. What is the chemical symbol for iron?
 
 
 
 
4. What colour would Universal Indcator turn when added to a weak acid?
 
 
 
 
5. When crystals of copper sulphate are heated strongly in a test tube they
 
 
 
 
6. Word equations for 4 different reactions are shown.
Which of them is an example of a combustion reaction?
 
 
 
 
7. The term ‘ TEXTILES’ refers to what group of substances?
 
 
 
 
8. Which of the below is a fossil fuel?
 
 
 
 
9. If water is added to anhydrous copper sulphate what would be the colour of the product?
 
 
 
 
10. He is the symbol for which chemical element
 
 
 
 
11. What colour is magnesium oxide
 
 
 
 
12. What is the chemical formula for SALT (sodium chloride)?
 
 
 
 
13. Is carbon dioxide a solid, liquid or gas?
(at normal room temperature)
 
 
 
14. About 20cm of magnesium ribbon is chopped up into 1cm lengths and placed in a crucible which is then weighed along with its lid.
The crucible is heated strongly and the lid gently raised avery few seconds.

When the reaction is over the crucible + contents + lid are all re-weighed

These are his results:
  • Mass of empty crucible + lid  = 51.2g
  • Mass of crucible + lid + magnesium (before heating) = 54.3g
  • Mass of crucible + lid + contents (after heating) = 54.7g
 

Did the magnesium gain mass, loose mass or not change in mass?
 
 
 
 
15. Word equations for 4 different reactions are shown.
Which of them shows oxidation and reduction taking place?
 
 
 
 
16. What colour is anhydrous cobalt chloride?
 
 
 
 
17. If hydrated copper sulphate is heated until it has all decomposed the solid product will: …..
 
 
 
 
18. cuso4.3-300x225This apparatus is being used to collect the water produced when copper sulphate is heated.

Why is it an important safety requirement not to let the open end of the delivery tube touch any water in the beaker or test tube?
 
 
 
 
19. apparatus1The image  represents what piece of apparatus?
 
 
 
 
20. What will iodine do when heated in an open test tube?
 
 
 
 
21. How is hydrogen made in the laboratory?
 
 
 
 
22. What colour is hydrated copper sulphate
 
 
 
 
23. measuring cylinder2This diagram shows a measuring cylinder being used to measure the volume of some water.

What volume of water is being measured?
 
 
 
 
24. Name a non-metallic element that conducts electricity
 
 
 
 
25. Is water an element compound or mixture?
 
 
 
26. What is the word equation for the thermal decomposition of copper carbonate
 
 
 
 
27. How is carbon dioxide made in the laboratory?
 
 
 
 
28. Metal is the best material for a radiator because it
 
 
 
 
29.
AfiltrationB
liebig
C
measuring_cylinder
D
change2
Which diagram above contains a Liebig condenser?
 
 
 
 
30. Which of these is a chemical change?