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Classify the following reactions into ...

Classify the following reactions into combination,displacement,decomposition and double dispacement reaction.
a) `NaCl + AgNO_3 rarr NaNO_3 + AgCl`
b) `Mg + H_2SO_4 rarr MgSO_4 + H_2`
c) `2H_2 + O_2 rarr 2H_2O`
d) `2HI rarr H_2 + I_2`
e) ` CaCO_3 rarr CaO + CO_2`
f) `Na_2SO_4 + BaCl_2 rarr BaSO_4 + 2NaCl`
g) `Zn + 2HNO_3 rarr Zn(NO_3)_2 +H_2`
h) `2Na + Cl_2 rarr 2NaCl`

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