Teaching Bihar STET Paper 1 (माध्यमिक) Mock Test 2024 General Science Chemistry Chemical Reaction

Which of the following reactions is the metal displacement reaction? Choose the right option.

1
2Pb(NO3)2 → 2PbO + 4NO2 + O2↑
2
2KClO3 \(\stackrel{\Delta}{\longrightarrow}\) 2KCl + 3O2
3
Cr2O3 + 2Al \(\stackrel{\Delta}{\longrightarrow}\) Al2O3 + 2Cr
4
Fe + 2HCl → FeCl2 + H2↑
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