ICSE − Q & A

*CHEMISTRY* Chapter 1 :
Do all the definitons, on a paper make a chart and with arrows mark trends. Make a table which tells the factors, Highest , lowest. Write keypoints of give reason answers eg  : Chlorine has more EA than Fluorine : F - small size - electro repulsion 

Chapter 2 :
Do the definitons. Structure of all electrovalent and Covalent are similar, go through them once if you are confused, DON'T forget to write the electrovalency, do the lone pair effect and NH4+ and H3O+ coordinate bonds. Make a two column table and write the difference in properties of electrovalent and covalent compounds in KEYWORDS ( I am emphasising because long answers are boring to read , takes time but keywords can instantly make you remember the crux of the matter).

Chapter 3 :
Do all definitions . Make a table and write the general formulae of preparation of acids and base : such as H2 + halogen = acid; Metal + O2 = Base ;(there are more)
Go through the uses and the pH paper page. Learn the change in colours of indicators and the difference between them. Learn the SI Unit of pH and pH = -log H+
For salts learn solublity , just the general formula of all salt preparation ( w/ insoluble and soluble / dilute and conc and temp written) . With this you can make your own equations. Go through the examples once. Go through the preparation of specific salts with emphasis on FeCl3. Learn the properties, WOC , deliquiscence, efflorescence , Hygroscopy and Hydrolysis - learn the pH of solutions.

For Stoichometry - Learn the 2 laws , go through examples and understand what it means : Gay Lussac's is only for volume , Avogadro's can be of moles / mass / volume
Then solve last 10 years and behind book questions.

Lead Nitrate reacts with Dilute or Concentrated Sulphuric acid to give Lead Sulphate?

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!!