POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

[сᴏᴏʟ сяуѕтᴀʟѕ]

Assalam-o-alaikum wr wb...

can someone please tell me the answer to this question!

Jazakallah Khair...

 

[L-Girl]

Assalam-o-alaikum wr wb...

can someone please tell me the answer to this question!
View attachment 12192
Jazakallah Khair...

it's B
because electrolysis of molten sodium chloride will only produce sodium and chlorine.
but the electrolysis of aqueous sodium chloride will form chlorine at the anode, hydrogen at the cathode, and sodium hydroxide. this is due to the presence of H+ and OH- ions as wells as Na+ and Cl-
hope this answers your question

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

it's B
because electrolysis of molten sodium chloride will only produce sodium and chlorine.
but the electrolysis of aqueous sodium chloride will form chlorine at the anode, hydrogen at the cathode, and sodium hydroxide. this is due to the presence of H+ and OH- ions as wells as Na+ and Cl-
hope this answers your question

in aqueous solutions...the one lower in the series is discharged, in this case OH- ions...

the thing you are saying is when the solution is concentrated but in the question, no where it is mentioned that it is concentrated which means it is dilute

 

[L-Girl]

in aqueous solutions...the one lower in the series is discharged, in this case OH- ions...

the thing you are saying is when the solution is concentrated but in the question, no where it is mentioned that it is concentrated which means it is dilute

no it doesn't have to be dilute

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

no it doesn't have to be dilute

what do you mean?

 

[Skynox]

what do you mean?

As you mentioned it has to be concentrated but the dilute solution gets concentrated due to the discharge of OH- and H ions....

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

As you mentioned it has to be concentrated but by time the dilute solution gets concentrated due to the discharge of OH- and H ions....

umm...okie i get you..but why are we supposed to see/wait till all the OH- ions are over?

 

[L-Girl]

As you mentioned it has to be concentrated but by time the dilute solution gets concentrated due to the discharge of OH- and H ions....

exactly!

 

[L-Girl]

umm...okie i get you..but why are we supposed to see/wait till all the OH- ions are over?

it will occur. in the question it is asked which of the 2 solutions could form the 3 products

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

it will occur. in the question it is asked which of the 2 solutions could form the 3 products

hmm okie...Jazakallah Khair both of you..

May Allah make the papers ez for you and may He give you success in this world as well as the Hereafter...Aameen!

 

[L-Girl]

hmm okie...Jazakallah Khair both of you..

May Allah make the papers ez for you and may He give you success in this world as well as the Hereafter...Aameen!

thank you so much for your du'aa.. same to you

 

[meriama]

guys can someone help me out with bio P12 - nov 2010 questions 29 and 40.
thanks

 

[Razo513]

guys can someone help me out with bio P12 - nov 2010 questions 29 and 40.
thanks

29 --> A it's the steepest curve (steep means faster)
40--> A they said persistent pesticide DOESNT BREAK DOWN ( so answer cant be B) it cant be D cuz most pesticides dissolve in water .. it cant be A since it becomes less concentrated rising up the food chain

 

[meriama]

i'm sorry but which paper is that?? coz i think it's different, but thanks for replying back

 

[Tekno-M]

Assalam-o-alaikum wr wb...

can someone please tell me the answer to this question!
View attachment 12192
Jazakallah Khair...

I think the question is missing some information, because for the aqueous sodium chloride, if it is concentrated, chlorine is produced at the anode, but if it's dilute, oxygen is produced. And sodium hydroxide is produce either way, concentrated or dilute. But molten sodium chloride only gives sodium and chlorine. Hope this helps

 

[fishcook]

anyone has answers for 1993-2004 bio

 

[Hammad Siddiqi]

Hi... You can earn online during your summer vacations
read the blog
iearnvillage.blogspot.com

 

[FATIMAH]

PLZ ANYONE HERE CAN HELP ME !!!
HOW WILL WE KNOW THAT THE FIRST ONE WILL BE DISPERSE BY ANY MAMMAL AND THE SECOND ONE BY WIND ??? IS THERE ANY VISIBLE FEATURE ???

THANKS IN ADVANCE

 

[saroooor]

PLZ ANYONE HERE CAN HELP ME !!!
HOW WILL WE KNOW THAT THE FIRST ONE WILL BE DISPERSE BY ANY MAMMAL AND THE SECOND ONE BY WIND ??? IS THERE ANY VISIBLE FEATURE ???

THANKS IN ADVANCE View attachment 12212

Fruit 1 seems spiny which would stick on the mammals fur , but fruit 2 seems wide spread Like Parachute seeds has many hairs which helps it to be carried some distance by the wind .

 

[Mymuharraq]

LOL she never mentioned the subject so i was checking bio

THIS HAPPENED TO ME TOO!!