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  1. сᴏᴏʟ сяуѕтᴀʟѕ

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    aoa wr wb... the answer is C...bcoz sodium hydroxide is alkaline so the pH will be 12 and when EXCESS hydrochloric acid is added...it will become acidic i.e the pH will be 3.
  2. сᴏᴏʟ сяуѕтᴀʟѕ

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    Assalam-o-alaikum wr wb.... is the answer D? :unsure:
  3. сᴏᴏʟ сяуѕтᴀʟѕ

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

    Assalam-o-alaikum wr wb... first we filter the solution to remove the excess copper (II) oxide... then we concentrate the resulting solution...concentrating it means heating it to crystallization point! then we filter and wash the residue to obtain a pure sample! these are basically the steps...
  4. сᴏᴏʟ сяуѕтᴀʟѕ

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

    yeahp...you are correct :)
  5. сᴏᴏʟ сяуѕтᴀʟѕ

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

    i think the answer is B... well what you have to do is write a combustion equation for the reaction (in order to find the answer you need to write for all...but as far as i 'remember' i think the answer is B so i will write only for it :p) if you want me to write for all...you surely can ask :)...
  6. сᴏᴏʟ сяуѕтᴀʟѕ

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

    sure :) Well...this is bcoz there are more purple fruit than yellow fruit...if you count them they are approx in the ratio 3:1 how can you get this ratio? by crossing 2 Heterozygous plants...i.e Pp x Pp if still did not understand...feel free to ask :)
  7. сᴏᴏʟ сяуѕтᴀʟѕ

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

    yeahp...they do! the question is what wil be lacking in their diet? in phloem tubes they wil get both amino acid and sucrose..and some amount of water too! the only thing missing in a plant is 'fat' so the answer is B :)
  8. сᴏᴏʟ сяуѕтᴀʟѕ

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

    Assalam-o-alaikum wr wb... 2 is the cathode...copper is lower in the series so it will be discharged at the cathode i.e cathode will be electroplated... on electrode 1...Oxygen will be liberated...on electrode 3 chlorine and on electrode 4 Hydrogen will be liberated... so the answer is C, 2 only!
  9. сᴏᴏʟ сяуѕтᴀʟѕ

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    LOL bcoz heat is liberated :p okie! on a serious note...there are some reactions which you should know/memorize whether are they endothermic or exothermic...for instance neutralization reactions, combustion reactions e.t.c! so juss remember that this reaction...that is adding water to...
  10. сᴏᴏʟ сяуѕтᴀʟѕ

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

    yeahp..i agree with Rahma Abdelrahman
  11. сᴏᴏʟ сяуѕтᴀʟѕ

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

    okie..Jazakallah Khair :)
  12. сᴏᴏʟ сяуѕтᴀʟѕ

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    it is exothermic bcoz the temperature increases :P
  13. сᴏᴏʟ сяуѕтᴀʟѕ

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    wa eyyakum :)
  14. сᴏᴏʟ сяуѕтᴀʟѕ

    AWWH...Mashallah =D and thanksh...i knew i am special ;)

    AWWH...Mashallah =D and thanksh...i knew i am special ;)
  15. сᴏᴏʟ сяуѕтᴀʟѕ

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    it is a reversible reaction...when you add water to blue solid (anhydrous cobalt chloride) it will become hydrated that is, will change to pink....this is an exothermic reaction so the temperature rises and therefore the answer is B :)
  16. сᴏᴏʟ сяуѕтᴀʟѕ

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    Well...it says ALL the Oxygen in the dry air is reacted...the percentage of Oxygen i air is 20% % of air remainingis 100 - 20 = 80% Volume of air remaining = 120 cm3 we will cross multiply! % of remaining air - 80% Total air - 100% Volume...
  17. сᴏᴏʟ сяуѕтᴀʟѕ

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    bio or chemistry?
  18. сᴏᴏʟ сяуѕтᴀʟѕ

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    umm...yeah i 'guess' it's correct :)
  19. сᴏᴏʟ сяуѕтᴀʟѕ

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    I tried my best to clear your doubts...if still you need any help you are free to ask :)
  20. сᴏᴏʟ сяуѕтᴀʟѕ

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    Assalam-o-alaikum wr wb...
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