Hich of the following is best described as a decomposition reaction? hcl + nahco3 → h2o + co2 + nacl 2na + cl2 → 2nacl 2hgo → 2hg + o2 agno3 + nacl → agcl + nano3

The answer to your question is: c

Explanation:

A descomposition reaction is a chemical reaction in which the only one reactant yields two or more products.

a) HCl + NaHCO3 → H2O + CO2 + NaCl

This is not a descomposition reaction because there are two reactants not one, this option is incorrect.

b) 2Na + Cl2 → 2NaCl

THis option is also incorrect because there are two reactants in descompositin reaction there is only one reactant.

c) 2HgO → 2Hg + O2

There are only one reactant that yields 2 products, this is a descomposition reaction.

d) AgNO3 + NaCl → AgCl + NaNO3

THis is not a descomposition reaction because there are two reactants.

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation: