the chemical reaction is:
ZnCO3(s) + 2HNO3(aq) → Zn(NO3)2(aq) + H2O(l) + CO2(g)
So, the gas is carbon dioxide
CO2
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NiCO3 + HCl =NiCl2 + H2O +CO2
2NaHCO3 + H2SO4 --> Na2SO4 + H2O(l) + CO2(g)
Potassium reacts explosively.
Carbon Dioxide
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CO2
NiCO3 + HCl =NiCl2 + H2O +CO2
zinc reacts with dilute HCl to form H2. This works to reduce (add Hydrogens to ) a compound
calcium nitrate , carbon dioxide and water are formed...
Sodium Chloride , water and Carbon Dioxide is formed causing "gassing"
2NaHCO3 + H2SO4 --> Na2SO4 + H2O(l) + CO2(g)
The hydrogen chloride: HCl.
Potassium reacts explosively.
CO2 gas is formed, and as it is leaving the instrument in which this reaction is done in, the mass decreases.
carbon dioxide