Biology; Chemistry; Physics: Post your doubts here!

[spacemaster960]

cuz it said aluminium as an insulator with copper so it was wrong

what about the other questions??

 

[exploded diper]

to do the due...

Dar kay aagay jeet hai

 

[Faizan Muhammmad]

why is bromine getting discharged in b(i) ??
concenteration isnt mentioned??

 

[asadalam]

View attachment 43354
why is bromine getting discharged in b(i) ??
concenteration isnt mentioned??

If question says aqueous it means concentrated,otherwise in such questions about halogen migrations it would mention dilute.

 

[Faizan Muhammmad]

If question says aqueous it means concentrated,otherwise in such questions about halogen migrations it would mention dilute.

that is really stupid of CIE, yah rasam o ravaj unn k hamein kis tarah pta?
likhtay waqt kia masla tha unhain, baad main er kahtee hai most of them wrote oxygen bubbling

What other things are like this?

 

[Fate0]

View attachment 43354
why is bromine getting discharged in b(i) ??
concenteration isnt mentioned??

One thing my teacher has told me that whenever they say aqueous, take it as concentrated unless they have specifically mentioned it as dilute.

 

[asadalam]

that is really stupid of CIE, yah rasam o ravaj unn k hamein kis tarah pta?
likhtay waqt kia masla tha unhain, baad main er kahtee hai most of them wrote oxygen bubbling

What other things are like this?

Maybe its to encourage students to practice past papers

 

[Faizan Muhammmad]

One thing my teacher has told me that whenever they say aqueous, take it as concentrated unless they have specifically mentioned it as dilute.

any other such helpful things which can prevent me from getting slaughtered ?

 

[Faizan Muhammmad]

Maybe its to encourage students to practice past papers

or to just be irritating

 

[kirann]

the answer is B

 

[kirann]

ans is A how?

 

[Awesome12]

ans is A how?View attachment 43359

See the empirical formula is the simplest ration in which atoms combine
So lets consider option A

Butanoic acid has a formula C4H8O2

If we simplify this, we will get
C2H4O

So A is the answer

 

[exploded diper]

the answer is B
View attachment 43357

sulphur dioxide is made....
test for sulpher dioxide is potassium di chromate..
as so2 is a reducing agent
the colour change will be frm orange to green

 

[kirann]

See the empirical formula is the simplest ration in which atoms combine
So lets consider option A

Butanoic acid has a formula C4H8O2

If we simplify this, we will get
C2H4O

So A is the answer

dividing it by 2? always?

 

[kirann]

sulphur dioxide is made....
test for sulpher dioxide is potassium di chromate..
as so2 is a reducing agent
the colour change will be frm orange to green

SO2 is oxidised so becomes a reducing agent right?

 

[Awesome12]

dividing it by 2? always?

No. You have to put it in the simplest way
For example the empirical formula for Propane (C3H6) is
CH2

We are dividing by 3 here

 

[kirann]

D is its answer

 

[exploded diper]

SO2 is oxidised so becomes a reducing agent right?

s is oxidised to so2...which is itself already a reducing agent......

 

[kirann]

No. You have to put it in the simplest way
For example the empirical formula for Propane (C3H6) is
CH2

We are dividing by 3 here

oh ok i got it

 

[kirann]

ok, got it

s is oxidised to so2...which is itself already a reducing agent......