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How can 3 different versions of X be formed? I can only count 2 different versions.
Summer 2010, Variant 12, Q25.
Summer 2010, Variant 12, Q25.
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Will not the condition effect the product? i mean hot / cold oxidising agent?
ANY1 WITH ACCURATE N PRECISE PHYSICS CHEMISTRY NOTES??? POST THM.....DO REVISION GUIDDES WORK WELL????
yes it does affect the product formed...... when potassium manganate (VII) is added to an alkene if cold and dil. then the product formed is a diol and when hot conc. then the final product formed is a carbonyl compoundnhin...i think not since i have not read it anywhere...I may be wrong.
Q.33
In a triple or a double bond, there is only ONE SIGMA BOND, the rest are PI bonds hence option 1 is wrong
the pi-bond cannot itself rotate hance the rotation can only take place along the sigma bond axis.
since option 2 and 3 are correct, the answer is C.
Q18: It says that when it was heated without any air so no compound was added or removed from the Ammonium Cynate. Only the addition of CNO will balance both sides Ammonium will be Nh4. The compound was NH4CNONov 09 P12, can someone explain Q 18 , Q20 , Q22_Why not B? And Q40 ...
And in June 2010 P11 Q35?!!! How is it C?!! How is Carbon wrong while Sulfur is right?!!! I really don't get it!
Please reply asap ...
ye
yes it does affect the product formed...... when potassium manganate (VII) is added to an alkene if cold and dil. then the product formed is a diol and when hot conc. then the final product formed is a carbonyl compound
Nov 09 P12, can someone explain Q 18 , Q20 , Q22_Why not B? And Q40 ...
And in June 2010 P11 Q35?!!! How is it C?!! How is Carbon wrong while Sulfur is right?!!! I really don't get it!
Please reply asap ...
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w08_qp_1.pdf
Can someone explain to me on question 7, 15 , 30, 32,39. Thx
B and C can be easily eliminated. The answer is D or A? And can you please tell me the year and number of this question?MCQ:
A solid melts sharply just above 100°C. It doesn't conduct electricity even when molten.
It dissolves in hydrocarbon solvents.
What is the structure of the solid most likely to be?
A An atomic crystal
B An ionic crystal
C A giant molecular crystal
D A molecular crystal
I have eliminated B and D from the answers... but the remaining choices leave me getting mere shots in the dark and not sure answers.
Q21- Substitute n by numbers 1 to 4. then find all isomers. There will be 7.
Q37- In 2 there will be only one ketone and one acid as there is one primary and one secondary C atom. In 3 a ketone and a dibasic acid will b produced. Only one has 2 secondary C atoms so it will produce 2 ketones.
Q39- H2SO4 will dehydrate the compounds. 1 on dehydration will produce an alkene which reacts with KMnO4. 2 also forms an alkene. 3 is an acid so it wont react with H2SO4.
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