ICSE − Q & A

am I the only one that feels that the papers were relatively hard this year? it seems like everyone on this site is getting like 95+ and i'm over here just hoping i'd get a 90+

Hey ,i have a doubt regarding biology plz check here👇

what r the 3 examples for compounds with dative bonds given in the viraf J dalal book
i hv the 2014 version and only h3o+ and nh4+ are given.

will Cuo react with hcl ?if yes pls check pg 140 of concise txt
and pls tell me the right ans....

*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