ICSE − Q & A

just 9 chapters left.what about yours?

colour of FeCl3 solution?

The ratio of the number of moles in 2 gram of hydrogen and 32 gram of oxygen is

1. What do u observe when HCl  is added to ZnS? ?
Do v write answer directly as: 
A gas is evolved which smells like rotten eggs

OR we write as
 
When HCl is added to ZnS,  a gas is evolved which smells like rotten eggs 

 2. Do we need to write percentage of each metal in an alloy...if asked or just names of metal is enough. 

3. Two hydrocarbons X and Y containing carbon and hydrogen only have vapour density 13 and 39 respectively. Find the molecular formula of X and Y.
(Plz send the working also...)

Will any marks are deducted if we write the answer starting from because for reasoning Questions ??

Hi when will economics, commercial applications and evs specimen paper 2018 be uploaded? thanks

Guys since I use the Viraf dalal book, I have finally decided that I will tear out and make pape planes or burn all the foolish reviews and comments of teachers. I don't know about you all, its honestly a waste of paper

Can we convert methane to methanoic acid directly in the following way...in just 1 step by catalytic oxidation.?

CH4 +  3[O] ----(KMnO4/ H2SO4)--->  HCOOH + H2O

In viraf, a lot of unnecessary eqns are given in organic. like reaction with h3po4 and all. Do we do that?

I'm don't understand what's the problem with me. Luck isn't favouring me in the exams. Looking at the paper during reading time, makes me so happy that I can't tell. I usually know the answers of almost every question in the paper but when I'm on my way to home, some of my classmates discuss the answers with me. At that time I realise that I've committed a blunder. Somewhere I didn't attempt a 4 marker by mistake, somewhere I interchanged the answers, etc. Why is this happening?? I've toiled throughout the year yet I'm myself deducting my marks unknowingly. Is this happening with anyone else among my resmates???