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Question

The following reactions evolve gases along with other products:

(1) NaHCO3+HCl
(2) NaOH+Zn
(3) NaCl+H2O
(4) MnO2+HCl
(5) CH4+O2
Identify the gases evolved in the above reactions?

A
(1,5)CO2,(2)H2,(3)Cl2 and H2,(4)Cl2
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B
(1,3)H2 and Cl2,(2)H2,(4)Cl2,(5)CO2
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C
(1)CO2 and Cl2,(2,5)H2,(3)Cl2,(4)H2 and Cl2
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D
(1)H2 and Cl2,(2,4)H2,(3,4)Cl2
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Solution

The correct option is A (1,5)CO2,(2)H2,(3)Cl2 and H2,(4)Cl2
The balance equations are:
1) NaHCO3+HClNaCl+H2O+CO2
(2) 2NaOH+ZnNa2ZnO2+H2
(3) NaCl+H2ONa+(ion)+Cl(ion)+H2O
(4) MnO2+4HCICl2+2H2O+MnCl2

(5) CH4+2O2CO2+2H2O
Hence the correct option is {a}

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