Answered

Predict the product of the ff. reactions:
K+Br2
Na2O + SO3
NaNO3 heat
CaCO3 heat
2n +H2SO4

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AwesomeHelperviz
1. KBr
2. Na2SO4
3. 2 NaNO2 + O2
4. CaO + CO2
5.2N H2SO4 

I'm not sure at No. 5