Chemistry Multiple Choice Questions (MCQ)
33 Dry hydrogen gas is passed over a powdered solid and then through a cooled U-tube before the excess of hydrogen is burned in air.
A colourless liquid collects in the U-tube.
What could the powdered solid be?
A calcium oxide
B copper(II) oxide
D zinc oxide
34 The element chromium liberates hydrogen from dilute hydrochloric acid although it does not react with cold water. When a piece of chromium is placed in lead(II) nitrate solution, crystals of lead appear.
What is the order of decreasing reactivity of the metals lead, calcium and chromium?
A calcium, chromium, lead
B calcium, lead, chromium
C chromium, calcium, lead
D lead, chromium, calcium
35 Three different beakers are set up as shown.
In beaker 1 metal W is displaced from solution.
In beaker 2 metal X is displaced from solution.
In beaker 3 metal Y is displaced from solution.
What is the order of decreasing reactivity of the four metals?
|most reactive least reactive|
36 Poly(ethene) can be manufactured by the process below.
Which diagram shows the change in molecular size during this process?
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