Common Entrance Chemistry – 30 Multiple choice questions

1. Name a substance with a pH value more than pH7
2. Four different substances are added to dilute sulphuric acid
Which of the substances would produce no reaction?
3. What is the chemical formula for SALT (sodium chloride)?
4. What is the chemical symbol for gold?
5. Which of the gases below burns well and can be used as a fuel?
6. apparatus3What is the name of the piece of apparatus shown?
7. Is carbon dioxide a solid, liquid or gas?
(at normal room temperature)
8. What is the chemical symbol for iron?
9. 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

What is the magnesium reacting with?
10. What colour would Universal Indcator turn when added to a neutral liquid?
11. What colour would Universal Indcator turn when added to a mild alkali?
12. What will chocolate do when heated gently in an open dish
13. What percentage of the air is nitrogen (approximately)?
14. What colour will universal turn when mixed with indigestion mixture?
15. apparatus2What is the name of the piece of apparatus shown?
16. Which of the gases below is sometimes put in balloons to make them float?
17. graph2The graph above shows the amount of a substance that dissolves in water at different temperatures.
In the experiment 3 different substances were tested.

How much of substance A dissolves in water at 80ºC?
18. I know that air is a GAS because (pick all that apply)
19. Pick an acidic oxide from the list
20. Tim mixed four different chemicals with water.

Which of them do you think dissolved?
21. What colour would Universal Indcator turn when added to a strong alkali?
22. Which single piece of apparatus would be the best to use if you wished to find the volume of glass in a glass stopper
23. Peter has three coloured felt pens which he labelled A, B and C.
He used the apparatus below to separate the dyes used to make colours from each of the pens.

Which pen has an ink made from 4 dyes mixed together?Chromatography_tank2
24. Word equations for 4 different reactions are shown.
Which of them shows oxidation and reduction taking place?
25. Pick a chemical that reacts with water
26. Limestone and chalk are made of which chemical compound?
27. You have four substances which you label A, B, C and D.
One is a mixture, one a metallic element one a non-metallic element and one a compound.

They have the following properties:
AA yellow, crumbly solid that burns to form a single colourless gas which turns universal indicator red
BA grey, malleable solid that burns to form a single white alkaline oxide
CA colourless liquid. The liquid is warmed in a shallow dish and after a few minutes a white residue is seen
DA green solid that decomposes when heated to form a colourless gas and leave a black powder
Which of the substances is likely to be a non-metallic element ?
28. Which is the best way to get the salt back from some salty water
29. Look at the graph below which shows the solubility of 3 substances A, B and C  in 100g of water at different temperatures
graph2How many grams of solute A dissolves in water which is at 70°C?
30. air

Look at the diagram above.

100 cm3 of air is put in one of the syringes. When the copper is heated it reacts with the oxygen in the air inside the syringe.

The syringe plungers are moved in and out so that all of the air is passed over the hot copper. When there is no further change the apparatus is allowed to cool (to allow the heated air to contract.Some copper remains unreacted because there is no oxygen left in the syringe.The gas remaining in the syringe is mostly nitrogen.ResultsVolume of air in syringe at start = 100cm3
Volume of air in syringe after heating = 79 cm3
 What volume of air was used up by the copper?


Anamaria Stefanie
Anamaria Stefanie