Fill in the blanks: Fe અને Mgથી વધુ સક્રિય ધાતુ છે. OR extPb(s) + ext (aq) ightarrow extPbCl2 ext(aq) + extCu(s)

Here are the solutions to the questions:

Step 1: Solve fill-in-the-blanks (Questions 1-18, 20-24)

1. Fe અને Mgથી Mg વધુ સક્રિય ધાતુ છે.
   • Explanation: Magnesium (Mg) is more reactive than Iron (Fe).
   • OR
   • $\text{Pb(s)} + \text{CuCl}_2\text{(aq)} \rightarrow \text{PbCl}_2\text{(aq)} + \text{Cu(s)}$
   • Explanation: This is a displacement reaction where lead displaces copper from copper chloride.
2. શ્વેત-શ્યામ