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

[Rahma Abdelrahman]

Oops! sorry. Checked the wrong one.
By the way why does the ms have the title 0625 Accounting.

I also noticed that, i think that's a mistake!
Examiners are human beings as well and do mistakes

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

assalaim alaikum wr wb
Could you give me the year ?

Walaikumassalam wr wb...

November 1997 Q19

 

[sophiaaa]

help me wid this one.....oct nov 2003 biology p1.q no..32 asap

 

[Maz]

help me wid this one.....oct nov 2003 biology p1.q no..32 asap

That's A Levels I suppose. This thread is for IGCSE.

 

[saroooor]

Assalam-o-alaikum wr wb...
just want to 'confirm' one answer..

View attachment 12432​

assalam alaikum wr wb
Plz can anyone answer that question with a reasoning ?

 

[Besterlinks]

Could give me the year ?

June 1997 IGCSE Chemistry

 

[Besterlinks]

assalam alaikum wr wb
Plz can anyone answer that question with a reasoning ?

Its definitely B. I did the same question. Iodide anion always gives yellow colour. If you are solving one of the 1990s papers, the mark scheme shows the wrong answer.

 

[Maz]

assalam alaikum wr wb
Plz can anyone answer that question with a reasoning ?

It's Potassium iodide(B).If you remember the test for anions, adding lead nitrate to acidified iodides give a yellow ppt.

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

Its definitely B. I did the same question. Iodide anion always gives yellow colour. If you are solving one of the 1990s papers, the mark scheme shows the wrong answer.

^agreed!
cuz it's not even a markscheme...

 

[Besterlinks]

Is the answer D??

Ya but why is it D and not B?

 

[saroooor]

It's Potassium iodide(B).If you remember the test for anions, adding lead nitrate to acidified iodides give a yellow ppt.

I know it should B. but according to the ms it says C , cool Crystals Said so in the ms . how could the ms get it wrong ? I am sure there is a reasoning behind this ?

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

I know it should B. but according to the ms it says C , cool Crystals Said so in the ms . how could the ms get it wrong ? I am sure there is a reasoning behind this ?

it is not the ms....it's juss an answer sheet which surely can be wrong

 

[Besterlinks]

I know it should B. but according to the ms it says C , cool Crystals Said so in the ms . how could the ms get it wrong ? I am sure there is a reasoning behind this ?

The mark scheme is not original (not published by CIE). Maybe that's why. No point in scratching your head to justify C. I am 100 % sure that its B.

 

[saroooor]

The mark scheme is not original (not published by CIE). Maybe that's why. No point in scratching your head to justify C. I am 100 % sure that its B.

Iam not LOL. Thanks Anyways .

 

[Besterlinks]

Iam not LOL. Thanks Anyways .

Hahaha

 

[ZainH]

Thank u so much!!
May Allah bless you with A* in all of the subjects....thank u so much once again!! =D

Thank you, and your welcome! I hope the same for you x)

 

[Besterlinks]

Please help me with question 21 of the attached PDF.

 

[Tekno-M]

Please help me with question 21 of the attached PDF.

1 and 3, chlorine bleaches the litmus and sulfur dioxide is acidic so I think it should turn the litmus red.

 

[Besterlinks]

1 and 3, chlorine bleaches the litmus and sulfur dioxide is acidic so I think it should turn the litmus red.

THANK YOU, BUT I REFERRED TO QUESTION 21 NOT QUESTION 22!

 

[Jspake]

Please help me with question 21 of the attached PDF.

I think the anser should be D.. this is because the mixture of ammonia and nitrogen will not react or dissolve in water and hence, the gas will remain intact. In other answers, the gas will react with the solution. Eg. A, sodium hydroxide will react with carbon dioxide to form sodium carbonate! Hope I helped..