Question

Analyse the table given below and answer the questions.

Metal	Cold water + Phenolphthalein	Hot water + Phenolphthalein	Reaction with MgSO4 Solution
A	No colour	Pink colour	Displacement reaction takes place
B	No colour	No colour	No reaction
C	Pink colour	Pink colour	Displacement reaction takes place

a. Find out the metals which are likely to be A, B and C from the box given below.

Ca Cu Mg

b. Write down the chemical equation between metal ‘B’ and water.

Answer 1

a. A – Mg,

B – Cu,

C – Ca 

b. Cu (s) + 2H₂O (l) → Cu OH₂(aq) + H₂(g)