Metals and Non-metals | Activities in Text Book with Solution
Activity 3.11Collect all the metal samples except sodium and potassium again.
If the samples are tarnished, rub them clean with sand paper.
If the samples are tarnished, rub them clean with sand paper.
CAUTION: Do not take sodium and potassium as they react vigorously even with cold water.
Put the samples separately in test tubes containing dilute hydrochloric acid.
Suspend thermometers in the test tubes, so that their bulbs are dipped in the acid.
Observe the rate of formation of bubbles carefully.
Which metals reacted vigorously with dilute hydrochloric acid?
✅ Answer: Magnesium shows fastest reaction and hydrogen bubble formation.
With which metal did you record the highest temperature?
✅ Answer: Magnesium.
Arrange the metals in the decreasing order of reactivity with dilute acids.
✅ Answer: Mg > Al > Zn > Fe.
The following reactions occur.
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2(g)
Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g)