The presence of an impurity in a substance will cause the melting point to
be zero
reduce
increase
be stable
What volume of carbon(II) oxide is produced by reacting excess carbon with 10 dm3 of oxygen?
5 dm3
20 dm3
15 dm3
10 dm3
The rate of diffusion of a gas Y is twice that of Z. If the relative molecular mass of Y is 64 and the two gases diffuse under the same conditions, find the relative molecular mass of Z.
32
4
8
16
The radioisotope used in industrial radiography for the rapid checking of faults in welds and casting is
Carbon-14
Phosphorus-32
Cobalt-60
Iodine-131
