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Chemistry: Post your doubts here!

Casablanca

Casablanca

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saudha said:
Use of the Data Booklet is relevant to this question.
Which element is likely to have an electronegativity similar to that of aluminium?
A barium
B beryllium
C magnesium
D strontium


why is it B....how?
Click to expand...

Are you sure it's B and not C? I thought the answer to this question was C, since Mg is in the same period, and according to the book, their electronegativity is similar. :/
 
umarashraf

umarashraf

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oh goog... look.. we have 3 products.. ethene methane and propene...

if i mole is produced by cracking, then o.5% will be of ethene(as mentioned in the q) then 0.25 of propene and .25 of methane is produced... .25+.25+.5=1...

to convert .25 into proper fraction, we need to multiply it by 4 to bring it to a whole number... by doing this.. we will get 1 mole of propene, 1 mole of methane and 2 moles of ethene(.5*4).. no of Carbons now we have are 8 all together... so B is the answer...
 
saudha

saudha

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Casablanca said:
Are you sure it's B and not C? I thought the answer to this question was C, since Mg is in the same period, and according to the book, their electronegativity is similar. :/
Click to expand...
yup me too .... thought Mg but it is B- beryllium
 
saudha

saudha

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umarashraf said:
oh goog... look.. we have 3 products.. ethene methane and propene...

if i mole is produced by cracking, then o.5% will be of ethene(as mentioned in the q) then 0.25 of propene and .25 of methane is produced... .25+.25+.5=1...

to convert .25 into proper fraction, we need to multiply it by 4 to bring it to a whole number... by doing this.. we will get 1 mole of propene, 1 mole of methane and 2 moles of ethene(.5*4).. no of Carbons now we have are 8 all together... so B is the answer...
Click to expand...

thxx ... tht was good was explanation.......:)
 
étudiante

étudiante

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umarashraf said:
do you know have any concept about diagonal relationship of periodic table...???
Click to expand...
its about the thing that the first element in the group is in some cases similar in reactions to the elements of the group before it... for example, Be is similar in ways to the Alkali metals...
 
Afeef

Afeef

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saudha said:
Use of the Data Booklet is relevant to this question.
Which element is likely to have an electronegativity similar to that of aluminium?
A barium
B beryllium
C magnesium
D strontium
why is it B....how?
Click to expand...

I remember my Chemistry teacher told me that right adjacent elements share much of the same properties, so only beryllium is on right side of aluminium
 
xxfarhaxx

xxfarhaxx

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Muhammad Bin Anis said:
someone please help in the following questions
june 2007, p1 . Q 34, 36, 37
nov 2007, p1, q35
Click to expand...
june / 07-
Q 37 coz
1. energy is hs to b takn in to brk da bond, thrf endothermic
2. activation energy is high cz stng bnds btween N2..
3 N2 had tripl bonds. so bond energy is high!!!
ANS: A
 
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