Question

which of the following is redox and displacement reaction
1. CaCo3 -------Cao + CO2
2. 2Ca + O2 -----2Cao
3. Pb +CuCl2 ---+-PbCl2 + Cu
4. NaoH + HCl-----Nacl +H2O​

Answer 1

Answer:

3. and 4. equation has displacement reaction

Pb +CuCl2-------- PbCl2 + Cu

NaoH + HCL--------- Nacl+ H2O

Answer 2

A) CaCO3 → CaO+CO2 It is a Thermal decomposition reaction. where heat energy is supplied to split calcium carbonate into calcium oxide and carbon dioxide.

B) 2Ca + 02 → 2CaO

It is combination reaction as two reactants react to form a single product.

c)Pb + CuCl2 → PbCl2 + Cu It is displacement reaction. As lead is more reactive than copper. It displaces copper from CuCl2.

d)2FeSO4 → Fe2 O3 + SO2 + SO3 It is decomposition reaction.

e) Correct equation: Na2 SO4 + BaCl2 → BaSO4 + 2NaCl Double displacement reaction as mutual exchange of ions takes place.

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