ICSE − Q & A

1. A lead compound that can be used to oxidize  hydrogen chloride to chlorine
2.State the observation: Cuo is treated with conc.HCl

Does copper react with HCl. 
I think no cause it is below  hydrogen but I checked on yahooanswers . com where someone proved that it does react. I'm confused.

Is lysol an antiseptic or disinfectant? Because it's given in both in Selina

is structural formula of methoxy propane in portion?... if yes then please post the answer

why halogens have high electron affinity

Why titration is necessary in case of preparation of Na2SO4? Is it also needed in case of neutralization of weak bases like Cu(OH)2?

how is Fe3O4 and Pb3O4 formed...(trick q out of scope)

Hi guys, hope all of your exams r going on well... Plz do take some pains to clear some of my doubts...
1. What happens to the other ions during preferential discharge other than the ones that are discharged?
2.Is it necessary to give an acid during electroplating in the electrolyte?
3.Is a block of silver or a hollow cylinder of silver used in electroplating?
4.Dissociation of NaCl in water is 99%. What do u mean by it?
5. In electrolysis of fused PbBr2, is there deposition of lead on the cathode or on the base of the vessel?

Additional questions:
1.Are we to draw stuff like rheostat, ammeter, battery, key etc etc in electrolysis diagrams?
2. Is current or voltage asked in exam?

Thanks in advance!!

Why is methane also called marsh gas?

Ostwald process in syllabus ???