Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test General Science Chemistry Chemical Reaction
Which of the following are Oxidation-reduction reactions?
a. 2Mg + O2 → 2MgO
b. MnO2 + 4HCl → MnCl2 + 2H2O + Cl2
c. 2Na + Cl2 → 2NaCl
d. 2NaBr + H2O → 2NaOH + Br2
1
only a
2
Only b, c
3
Only d
4
More than one of the above
5
None of the above