Biology; Chemistry; Physics: Post your doubts here!

[exploded diper]

View attachment 43361 D is its answer

unsaturated molecules with double bonds undergo addition reaction ... so ans is d..

 

[kirann]

unsaturated molecules with double bonds undergo addition reaction ... so ans is d..

B & C also have double bonds

 

[DaniyalK]

B & C also have double bonds

Only alkenes undergo addition polymerization. B is carboxylic acid and C is ester.

 

[kirann]

Only alkenes undergo addition polymerization. B is carboxylic acid and C is ester.

oh ok

 

[kirann]

C

 

[DaniyalK]

View attachment 43365
C

Oxidizing an alcohol(T) gives a carboxylic acid(S). Potassium dichromate is an oxidizing agent.

 

[kirann]

Oxidizing an alcohol(T) gives a carboxylic acid(S). Potassium dichromate is an oxidizing agent.

ill die in b/w oxidation and reduction

 

[kirann]

Oxidizing an alcohol(T) gives a carboxylic acid(S). Potassium dichromate is an oxidizing agent.

potassium dichromate is itself an oxidising agent and is used as a test for reducing agent?

 

[DaniyalK]

potassium dichromate is itself an oxidising agent and is used as a test for reducing agent?

Yeah. When reducing agents like KI get oxidized due to potassium dichromate, there is a colour change.

 

[asadalam]

 

[exploded diper]

CHEMISTRY CIE O LEVEL REVISION CHECKLIST RIGHT HERE!!

Just kidding - I need it, anybody has the link?

yeah i got the real ones .....
right here

-_-

 

[exploded diper]

what happens when ammonia is passed through cuo

 

[exploded diper]

do the proeprties of plactics like l d p e cum ?
do the specific uses of man made polymers like perpex , acrilan cum?
does the normal battery cell cum ?

 

[asadalam]

what happens when ammonia is passed through cuo

2NH3(g)+3CuO(s)=N2(g)+3Cu(s)+3H2O(g)

 

[Laibaaa]

http://papers.xtremepapers.com/CIE/...l O Level/Chemistry (5070)/5070_s10_qp_12.pdf

Someone please explain Questions ; 1 , 4 , 24 , 25 , 28
My worst p1

 

[asadalam]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_s10_qp_12.pdf

Someone please explain Questions ; 1 , 4 , 24 , 25 , 28
My worst p1

1.c it is inverted which shows the gas to be collected is light.Only light one is Hydrogen
4.It says present in solution AFTER reaction,CaCl2 is a soluble salt,thus Cl ions would be present in solution.
24.Oxygen is above iron in reactivity series.
25.Only zinc reacts with dil HCL,copper deposit is seen
28.Magnesium is more reactive,thus reacting more.

 

[Laibaaa]

1.c it is inverted which shows the gas to be collected is light.Only light one is Hydrogen
4.It says present in solution AFTER reaction,CaCl2 is a soluble salt,thus Cl ions would be present in solution.
24.Oxygen is above iron in reactivity series.
25.Only zinc reacts with dil HCL,copper deposit is seen
28.Magnesium is more reactive,thus reacting more.

Thank youu so much
Damn you're smart.
But Q)28, how did we deduce the least volume of H2?

 

[asadalam]

Thank youu so much
Damn you're smart.
But Q)28, how did we deduce the least volume of H2?

Mixture would contain magnesium which could still increase H2 production,while pure Zn would not produce that much.

 

[peacce]

what years r u guys focusing?

 

[asadalam]

what years r u guys focusing?

Mai to movie dekh ra hoon bhai,chemistry has abandoned me