1.

Which of the following is redox reaction? (1) AgNO3 + NaCl  AgCl + NaNO3 (2) CaCO3 + H2SO4  CaSO4 + CO2 + H2O (3) 2Na + 2H2O  2NaOH + H2 (4) Cu(OH)2 + 2HCl  CuCl2 + 2H2O

Answer» Which of the following is redox reaction?
(1) AgNO3
+ NaCl  AgCl + NaNO3
(2) CaCO3
+ H2SO4  CaSO4
+ CO2
+ H2O
(3) 2Na + 2H2O  2NaOH + H2
(4) Cu(OH)2
+ 2HCl  CuCl2
+ 2H2O


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