Qualification > Sciences
ALL CIE CHEMISTRY DOUBTS HERE !!
narnia:
M/J 02, p1, ques.13,21,27....I hv the ans., but how??
elemis:
--- Quote from: narnia on April 04, 2011, 07:41:52 pm ---M/J 02, p1, ques.13,21,27....I hv the ans., but how??
--- End quote ---
Question 13
Al2O3 is amphoteric and will react with the alkaline solution.
SO2 disolves in NaOH and is neutralised.
SiO2 reacts with NaOH to form Na2SiO3 and water.
By process of elimination MgO is the only possible answer.
Question 21
I'm not going to do this for you. Draw each and every possibility out on a sheet of paper and think of all possible placements of the Cl.
Question 27
Ethane is a gas so it is eliminated.
Potassium manganate(VII) would oxidise Ethanol to a carbonyl compound, so it is eliminated.
Ethanoic acid has a permanent dipole allowing for hydrogen bonding between H2O and its molecules. Hence, it mixes well with water. Thus, it is eliminated.
Ethyl Ethanoate is the answer as per process of elimination.
narnia:
Excuse me please, the answer to question 13 is MgO & not Al2O3.
for question 21,I got confused by the formula given, so asked.
But I really appreciate & thank you for your consideration. =)
elemis:
--- Quote from: narnia on April 05, 2011, 06:02:52 am ---Excuse me please, the answer to question 13 is MgO & not Al2O3.
for question 21,I got confused by the formula given, so asked.
But I really appreciate & thank you for your consideration. =)
--- End quote ---
My bad, I misread the question. I though we were talking about dissolving in WATER. It seems we have to consider NaOH as the solvent.
narnia:
--- Quote from: Ari Ben Canaan on April 05, 2011, 07:26:03 am ---My bad, I misread the question. I though we were talking about dissolving in WATER. It seems we have to consider NaOH as the solvent.
--- End quote ---
no problems.
how can ch3ch2ch2ch3 can result from mixing ethane n cl2 in uv light?? =/
also, when temp increases, the boltzman distrbtn curve move to d right or left?
bcz as far i know, it moves to right n bcums broader n shorter, but in oct04 p1 q12, the corect ans is b...where it movd to d left...im sorry i cant attach the ppr since im on from a mobile device.
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