Question

Which set of coefficients correctly balances the following chemical equation?__ AgNO3 + ___ MgCl2 --> ___ AgCl + ___ Mg(NO3)2
4, 2, 4, 2
1, 2, 1, 2
2, 1, 2, 1
1, 1, 1, 1

Answer 1

it is C 2 1 2 1

You have to 1st balance the nitrates then balance the silvers to get the coefficients

Answer 2

It's the 3rd one.
Ag balances with 2
NO3 balances with 2 
Mg balances with 1
Cl balances with 2