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(1) Roasting is carried out on sulphide ores and not on carbonate ores.
(2) Lead is used for welding purposes but its alloy solder is used.
(3) Zine is used as a cathode in dry cells and is also alloyed with copper in the manufacture of brass.
(4) Hydrogen gas is liberated on addition of aluminium to dilute sulphuric acid.
(5) Extraction of aluminium from its ore is based on its position in the activity series.


4) because when metal reacts with acids they form hydrogen gas.
AL(metal)+ 2HCL-- ALCL(salt)+ H2 (GAS)
1 4 1
then there is a symbol of envelop can u get it
let me tell you that when i open your profile then on top there's your photo and below it there's no of answers you have given and points and no. of thanks horizontally and theñ subjects in which you are best are given. nothing else is there.
no its there only n here it shows that i already sent u frd req plz check it again
did u get my message now
plz tell
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