Question 1
Some information about four elements, P, Q, R and S, is shown.
Which elements are transition elements?
A
P and R
B
P and S
C
Q and R
D
R and S
Question 2
Which statements about transition elements are correct?
1 They have a low density.
2 They form ions with variable oxidation numbers.
3 They have a high melting point.
4 They form only colourless compounds.
A
1 and 2
B
1 and 4
C
2 and 3
D
3 and 4
Question 3
Which metal has variable oxidation numbers?
A
aluminium
B
calcium
C
copper
D
sodium
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