Aluminium becomes passive on treatment with :
dil. HNO3
conc. HNO3
dil. H2SO4
none of these
B.
conc. HNO3
Aluminium becomes passive on treatment with conc. HN03 , due to the formation of aluminium oxide on its surface which prevents it from further action .
HF is not preserved in glass bottle because :
it reacts with the visible part of the light
it reacts with the sodium oxide of the glass
it reacts with the aluminium oxide of the glass composition
it reacts with SiO2 of the glass
In a lead storage battery , reaction at cathode is :
Pb + SO42- PbSO4 + 2e-
Pb + PbO2 + 2H2SO4 2PbSO4 + 2H2O
PbSO4 + 2e- Pb + SO42-
PbO2 + 4H+ + SO42- + 2e- PbSO4 + 2H2O
In coagulating the colloidal solution of As2S3 .which has the minimum coagulating value ?
NaCl
KCl
BaCl2
AlCl3