A student set up three different electrochemical cells each containing two of the metals, X, Y
or Z, immersed in an electrolyte. The table below shows the voltage and the positive
terminal of each cell.
electrochemical cell
metals used
voltage/ V
positive terminal
1
Z and Y
+1.60
Y
2
X and Y
+1.10
X
3
X and Z
+2.70
X
What is the order of decreasing reactivity of the metals, X, Y and Z?
A X, Z, Y B Y,X,Z C Y,Z,X D Z,Y,X
Which of the following statements about metals is always correct?
A All metals have high melting and boiling points.
B All metals will be oxidised in air to form oxides.
C All metals are good conductors of electricity.
D All metals will react with acids to form a salt and hydrogen gas.
Some of the reactions of chromium are shown in the table below.
reaction with
product
cold water
dilute hydrochloric acid
copper(II) nitrate
none
hydrogen
copper
Which one of the following gives the order of decreasing reactivity of the metals copper,
calcium and chromium?
A calcium, chromium, copper
B calcium, copper, chromium