Teaching Bihar B.Ed CET Mock Test Series 2025 General Science Chemistry Chemical Reaction

Which of the following reactions is least likely to occur?  

1
2Al + Cr2O3 → 2Cr + Al2O3
2
Cu + 2H2O → Cu(OH)2 + H2
3
Cl2 + 2NaBr → Br2 + 2Nacl
4
2KCl + Br2 → Cl2 + 2KBr
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