Physics, Chemistry and Biology: Post your doubts here!

[thats_me]

plz need explanation for q. 19 june 2011

Ok
Now the question is asking for ions , Only the soluble one's will ionize
If they are not soluble they will form a priecipitate
Now, Silver & barium chloride are insoluble
Silver sulphate is in soluble
All nitrates are soluble
So, it will be nitrate

 

[sultan ahmed]

View attachment 12838

which years paper?

 

[sultan ahmed]

I don't think someone did it yet! And I heard that this year the 3 variants have different Q's!!!!

i need it man...tom i hv chem mcq!

 

[Rahma Abdelrahman]

plz need explanation for q. 19 june 2011

which variant?

 

[always-smile :)]

Ok
Now the question is asking for ions , Only the soluble one's will ionize
If they are not soluble they will form a priecipitate
Now, Silver & barium chloride are insoluble
Silver sulphate is in soluble
All nitrates are soluble
So, it will be nitrate

thnx soooooooooooooooooooooooooooooooo much

 

[Rahma Abdelrahman]

i need it man...tom i hv chem mcq!

We ALL have!

 

[thats_me]

thnx soooooooooooooooooooooooooooooooo much

Ur mooooooooooooooooooooost welcum

 

[sultan ahmed]

We ALL have!

bt dsnt the date of exam differ in different countries?

 

[Rahma Abdelrahman]

One difficult Q (I understand it, I just want to show it to u in case a similar one comes in the exam!):

From O level!

 

[sultan ahmed]

what

One difficult Q (I understand it, I just want to show it to u in case a similar one comes in the exam!):
View attachment 12841
From O level!

whats the answer?

 

[Student of the year]

View attachment 12838

q10 Ca=40 H2O=100
Ca+H2O=140
so Ca(OH)2 + H2=140
thus,Ca(OH)2= 140-H2
Ca(OH)2=140-2
=138

 

[Rahma Abdelrahman]

bt dsnt the date of exam differ in different countries?

U r in....(where?)

 

[sultan ahmed]

U r in....(where?)

ksa

 

[Rahma Abdelrahman]

what
s the answer?

What do u think?

 

[Rahma Abdelrahman]

ksa

Same here, Jeddah!

 

[thats_me]

bt dsnt the date of exam differ in different countries?

the date doesn't differ the time does ..

 

[sultan ahmed]

What do u think?

B?

 

[thats_me]

One difficult Q (I understand it, I just want to show it to u in case a similar one comes in the exam!):
View attachment 12841
From O level!

is it Ca2+?

 

[always-smile :)]

One difficult Q (I understand it, I just want to show it to u in case a similar one comes in the exam!):
View attachment 12841
From O level!

is the answer C ??

 

[Ahmedm96]

One difficult Q (I understand it, I just want to show it to u in case a similar one comes in the exam!):
View attachment 12841
From O level![/quot

ITS QUITE EASY THE nh4 DOESNT FORM PPT JUST SHARP SMELL GAS WHEN HEATED