X 4 = 2,0 Đ A) 2HGO + H2  2HG + H2O B) MG + 2HCL  MGCL2 + H2  C) CU + 2AGNO3 CU(NO3)2 + 2AG D) 2NA + 2HCL  2NACL + H2

Câu 1. (2,0 điểm) : 0,5 đ .x 4 = 2,0 đ

a) 2HgO + H

2

 2Hg + H

2

O

b) Mg + 2HCl  MgCl

2

+ H

2



c) Cu + 2AgNO

3

 Cu(NO

3

)

2

+ 2Ag

d) 2Na + 2HCl  2NaCl + H

2