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Contrast the action of heat on the following and explain your answer. (i) Na2CO3 and CaCO3 (ii) MgCl2.6H2O and CaCl2 .6H2O

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Contrast the action of heat on the following and explain your answer. 

(i) Na2CO3 and CaCO3 

(ii) MgCl2.6H2O and CaCl2 .6H2O

(iii) Ca(NO3)2 and NaNO3

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(i) Na2CO3 + Δ → No change (stable to heat) ; CaCO3 + Δ →CaO + CO2 

(ii) MgCl2.6H2O + Δ → MgO + 2HCl + 5H2O ; CaCl2.6H2O + Δ → CaCl2 + 6H2O 

(iii) Ca(NO3)2 + Δ → CaO + 2NO2 + 1/2O2 ; NaNO3 + Δ →  NaNO2 + 1/2O2

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