tra, CO mang ngan. Ke't luan nao dudri day la khong dung ?
Ạ Ke't thuc dien phan, pH ciia dung dich tang so vori ban d^ụ B. Thu- tir cac chat bi dien phan la CuClj, HCl, (NaCl va H j O ) . C. Qua trinh dien phan dung dich NaCl di kem v6i sir tang pH cua
dung djch.
D. Qua trinh dien phan dung dich HCl di kem v6i sir giam pH cua dung dich. dung dich.
5 . 7 2 . bao ve v 6 t^u bién bang thep, ngucri ta gin cac tám Zn ngoai v 6 tan (phdn dudri nude bien). Ngirdi ta da bao ve kim loai bang phuomg phap: (phdn dudri nude bien). Ngirdi ta da bao ve kim loai bang phuomg phap: Ạ Cach l i kim loai v6i moi truong.
B. Dung phuong phap dien h6ạ C. Diing Zn lam chat chÓng an mon. C. Diing Zn lam chat chÓng an mon. D. Dijng Zn la kim loai kh6ng dị Hay chon dap an diing.
5 . 7 3 . Cap kim loai A l - Fe tiep xiic v6i nhau va duoc d^ ngoai khdng khi am thi kim loai nao b| an mon va dang an mon nao la chính ? kim loai nao b| an mon va dang an mon nao la chính ?
Ạ A l bi an mon dien hoạ B. Fe bi an mon dien hoạ C. A l bi an mon hoa hoc. D. A l , Fe bj an mon h6a hoc.
5 . 7 4 . Truorng hop nao du6i day la an mon dien hoa ? Ạ Gang, thep d^ lau trong khCng khi ^m. Ạ Gang, thep d^ lau trong khCng khi ^m.
B. Zn nguyen chat tac dung vdri dung dich H2SO4 loang. C. Fe tac dung vdri khi C I 2 . C. Fe tac dung vdri khi C I 2 .
B. Zn nguyen chat tac dung vdri dung dich H2SO4 loang. C. Fe tac dung vdri khi C I 2 . C. Fe tac dung vdri khi C I 2 . thanh Fê"^. Két qua nao du6i day la diing.
Ạ E O B. E B. E F e ' * / F e 0 2 + < E va E 0 F e ^ V F e < E ^ F e ^ - ' / F e C u ^ - ' / C u va E ' Fé-^/Fê-' C. E O < E " va E O . Fe-^-'/Fe Cn^* ICM F e ^ - ' / F e D. Két qua khac. Hay chon dap an diing.
7 7 . Co phuang trinh hoa hoc sau : Fe + C U S O 4 FeS04 + Cụ Phuang trinh nao dirdi day bieu thj sir oxi hoa ciia phan iJng tren ? Phuang trinh nao dirdi day bieu thj sir oxi hoa ciia phan iJng tren ? Ạ Fê+ + 2e ->• Fẹ
B. Fe Fê^ + 2ẹ C. Cu^^ + 2e ^ Cụ C. Cu^^ + 2e ^ Cụ D. Cu ^ Cu2+ + 2ẹ
7 8 . Cho cac ion kim loai sau : Fê+,Fe2^ , Zn^^, N i ^ ^ , H'",Ag+. Chi^u tang dSn tinh oxi hda ciia cac ion la : tang dSn tinh oxi hda ciia cac ion la :
Ạ Z n 2 ^ F e 2 ^ H ^ , N i 2 + , A g ^
B. Z n 2 ^ Fe2^ N i 2 ", H ^ , Fe3^ A g ^ C. Z n 2 ^ Fe2^ N i 2 +, H ^ , A g ^ C. Z n 2 ^ Fe2^ N i 2 +, H ^ , A g ^ D. Fe2^ Z n 2 ^ N i ^ ^ , H + , Fê- A g ^