Physics, Chemistry and Biology: Post your doubts here!

[Saad the Paki]

I was wondering.
If we add an acid to potassium manganate (VII).... does it turn from pink to colourless?

 

[sj0007]

I have chemistry paper 6 tomorw and i need urgent help they r asking me to draw two intersecting straight lines in the graph? How to do tht? I can only see all the points fitting into a single line. how to do the 2 intersecting lines?

Which paper r u talking abt??
Anyways it's mostly like this:

 

[Kiara P.]

Which paper r u talking abt??
Anyways it's mostly like this:
View attachment 53512
View attachment 53513

Hey <3 !
Can you please send me the chemistry learner guide xo ?

Thank you sis !!

 

[misscute406]

Because of suck back

lagta hai chemistry main bhi pundit ho tum!!

 

[Kiara P.]

I was wondering.
If we add an acid to potassium manganate (VII).... does it turn from pink to colourless?

This usually happens in case of Alcohols only reacting with Acidified H+/KMno4 turning from Pink to Colourless.
It's a distinctive property of reaction for alcohols and the most famous.

Although I think it gives the same result when acid is reacted with KMnO4

 

[Saad the Paki]

lagta hai chemistry main bhi pundit ho tum!!

Maaf kardo behan ji..!

 

[misscute406]

Maaf kardo behan ji..!

ehehheheehe!! agar tum marks lete gaye toh hamara bhi sochna chahiye na!!

 

[The_Boss]

Wht is embeddedd web technology

Wrong forum mate!

 

[misscute406]

Maaf kardo behan ji..!

chalo koi baat nahi!!

 

[The_Boss]

Yeah ethanol is neutral !

Ethanol is an alcohol so its functional group is OH which dissociates into ions(partially) when an alcohol is added to water pH raises slightly from 7 causing an alkaline solution!

 

[Muaaz Iqbal]

is my diagram correct? If not please tell me how to draw
(And ignore my drawing i knw it's really bad)

Yes it is Right..
But you Also Have to label the Electrodes and Draw Bulb

 

[Saad the Paki]

When we draw 2 intersecting lines... should we extend the 2 lines till the edge of the grid.
or only till where the points are..
does it even matter?

 

[Muaaz Iqbal]

Yeah ethanol is neutral !

That's the Reason it is used as Solvent

 

[Muaaz Iqbal]

Lol good luck !! Waisay Hamza Iqbal ki shakal bohut buri ho gayi thi jab paper mila !! LOL

Paper kay bad haar banda kheta hay Paper asaan tha Lakin Paper mie Saab ki Phatt Gati hay Lol

 

[DANISH182]

Because of suck back

but in marking scheme it is written not suck back

 

[Saad the Paki]

but in marking scheme it is written not suck back

 

[Saad the Paki]

Can somebody explain part (d)....

 

[DANISH182]

you can check it!!!!!

 

[Kiara P.]

View attachment 53515
Can somebody explain part (d)....View attachment 53516

What year is this ?

 

[DANISH182]

What year is this ?

may june 2012 62