Question

 Construct chemical equation from the following:
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Answer 1

last one I did not understand

Answer 2

naoh+hcl-nacl+h2O

mg+2hcl-mgcl2+H2

ch4+04-co2+h2o+h2o

al2o+3h2so4-al2(so4)3+3h2O

last reaction is not visible