Acids and alkali(MC)

請詳細回答,感激!!

1.The elements listed below were burned in oxygen.The products were mixed with water.Which element would give a solution of pH value greater than7?

A.Calcium
B.Carbon
C.Hydrogen
D.Phosphorus

2.In which of the following cases will gas X produce an obvious change in the appearance of an aqueous soluton of Y??
X Y
A .Ammonium Ethanoic acid
B Water vapour Copper(II)sulphate
C. Sulphur dioxide Ammonia
D. Carbon dioxide Calcium hydroxide

3.Which of the following substances will not react with sodium hydroxide solution?
A.Ammonium chloride solution
B.Citric acid
C.Lead(II)nitrate solution
D.Potassium chloride solution

4.Which of the following ions when treated with excess aqueous ammonia, gives a clear solution without any precipitates??
A.Fe2+(aq)
B.Al3+(aq)
C.Cu2+(aq)
D.Pb2+(aq)

另外我還想問Neutralization的過程是怎樣

其實我完全不明白,請各位高手多多賜教,感謝各位!!