ICSE − Q & A

our teacher never thought us mole concept . will this come  in compulsory(sec A ) part

Can anything on the laboratory preparation of salts be asked(Pg.52 of Dalal book onwards)? (And don't ask me to simply 'go through it', I've done that.)

Can Someone help me with this numerical plz 
What volume of O2 at s.t.p will be obtained by the action of heat on 20g of KClO3 
(K=39, Cl=35.5, O=16)

Are periodic properties such as nature of oxides, hydroxides, oxy acids....there ?

The element which gets tarnished in moist air (options: Lead, aluminium, iron)

Name a black substance which is a oxidising agent and a catalyst

+ 1 more questions by jastefen  

Name a non metal made of salt which is used in dry cell
asked by Ja Steve (jastefen) 6 years ago
1

Distinguish between electrolytic methods of reduction and refining(Chapter 7D-aluminium)

+ 2 more questions by nehalg  

An electrolysis plant produces 315.5 litres of chlorine at STP per day by electrolysis of molten sodium chloride. The reaction which occurs is 2NaCl---->2Na + Cl- (a) what is the daily requirement(in kilograms) of common salt in the plant (b)How much metallic sodium is produced daily? (Pls show the working if you don't mind....)
asked by Nehal G (nehalg) 6 years ago
2

Explain: A neutral gas other than oxygen is formed at the anode during electrolysis of fused alumina.
asked by Nehal G (nehalg) 6 years ago
2

Why are the wooden shelves on which concentrated sulfuric acid bottles keep getting stained black?

how many atoms in 7 gram atoms of nitrogen. pls can someone explain. i'm confused when you take 14g and when you take 28g coz here they are saying atom

Can someone provide me with the most challenging questions in chemistry?