Which equation represents a neutralization reaction?
A) H2SO4 + Mg(OH)2 + MgSO4 + 2H2O
B) Na2CO3 + CaCl- 2NaCl + CaCO,
C) NI(NO3)2 + H2S- NiS + 2HNO3
D) NaCl + AgNO3 - AgCl + NaNO3

Which aqueous solution of ki freezes at the lowest temperature? 1) 1 mol of ki in 500. g of water 2) 2 mol of ki in 500. g of water 3) 1 mol of ki in 1000. g of water 4) 2 mol of ki in 1000. g of water