I need help with a chemistry assignment

I need help with a chemistry assignment

the correct orbital configuration of carbon is
1s^2    2s^1   2p^3
1s^1   2s^2  2p^3
1s^2   2s^2  2p^4
1s^2  2s^2  2p^2
22 what is the formula for lead (lV) oxide?
PbO2
PbO
Pb2O
Pb2O2
23 what is the name of the compound whose formula is CaSO4
calicium sulfoxide
calcium sulfate
calicum(l) sulfate
calicum sulfur tetroxide
24 which of these is a balanced chemical equation?
CH4+2O2–>CO2+2H2O
CH4+3O2–>CO2+H2O
CH4+O2–>CO2+H2O
CH4+3O2–>CO2+2H2O
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