(a)[2]
Fill in the table to work out the melting point of rubidium and the relative electrical conductivity of sodium.
(b)[2]
What is the physical state of caesium at $20\,^{\circ}\text{C}$? Explain your answer.
(c)[1]
Describe the pattern in the boiling points of the Group I metals.
(d(i))[2]
Complete the chemical equation for this reaction. $……\text{K} + 2\text{H}_2\text{O} \rightarrow 2\text{KOH} + ……$
(d(ii))[1]
State the colour of the flame when potassium reacts with water.
(d(iii))[2]
Because the solution is alkaline, describe how universal indicator solution can be used to determine its pH.