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Option C: Na2C2O4 + Pb(NO3)_2 = PbC2O4 + 2NaNO3

Explanation:

Na2C2O4 + Pb(NO3)_2

For it to be a double placement reaction, the cations and a ions will switch places in the product.

Now, on this reaction side;

Cations are; Na+ and Pb+

Anions are; C2O4^(-) and (NO3)^(-)

The product side will yield;

Na2C2O4 + Pb(NO3)_2 = 2NaNO3 + PbC2O4

the answer is 1260

you spend 7 hours in school for 1 school day with 5 school days in 1 school week with 36 school weeks in a school year.

7*5*36= 1260 it's all about multiplying