Biology; Chemistry; Physics: Post your doubts here!

[syed1995]

How can we liberate Ammonia from ammounium compounds?

reaction with alkali/base.... i guess

Assalam O Alaikum Guys, Just woke up

Heat Salt with an Alkali/Base.

 

[rabiafarooq101]

Assalam O Alaikum Guys, Just woke up

Heat with an Alkali/Base.

woke up

 

[multixamza01]

react it with alkalis

reaction with alkali/base.... i guess

So we have to react bases with alkalis , to produce a base!
That makes sense ....

 

[MustafaMotani]

just any one can explain that mcq I post or I have to assume that nitrogen came from atmosphere.. ??

 

[syed1995]

woke up

yea i went on a quick nap to freshen myself up .. =)

For which of the following can graphite be used?
A) as an abrasive only
B as an abrasive and as an electrode
C as an elecrode and as lubricant
D as a lubricant ..

What does abrasive mean ??

 

[a.abid]

just any one can explain that mcq I post or I have to assume that nitrogen came from atmosphere.. ??

can u post again?

 

[MustafaMotani]

can u post again?

http://www.xtremepapers.com/papers/...al O Level/Chemistry (5070)/5070_s08_qp_1.pdf
mcq 1

 

[rabiafarooq101]

yea i went on a quick nap to freshen myself up .. =)

For which of the following can graphite be used?
A) as an abrasive only
B as an abrasive and as an electrode
C as an elecrode and as lubricant
D as a lubricant ..

What does abrasive mean ??

abarsive ki example sandpaper hain ans is C na?

 

[multixamza01]

just any one can explain that mcq I post or I have to assume that nitrogen came from atmosphere.. ??

we have to assume nothing , nitrogen is present in the air around us. It's common knowledge . No assumption required

 

[a.abid]

yea i went on a quick nap to freshen myself up .. =)

For which of the following can graphite be used?
A) as an abrasive only
B as an abrasive and as an electrode
C as an elecrode and as lubricant
D as a lubricant ..

What does abrasive mean ??

abrasive means a material used to scratch something such as we use sandpaper for abrasive purposes...thats wat i think.... the answer in C anyways

 

[MustafaMotani]

yea i went on a quick nap to freshen myself up .. =)

For which of the following can graphite be used?
A) as an abrasive only
B as an abrasive and as an electrode
C as an elecrode and as lubricant
D as a lubricant ..

What does abrasive mean ??

its C

 

[syed1995]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Chemistry (5070)/5070_s08_qp_1.pdf
mcq 1

Answer Nitrogen hai ? Pagal ho kia :\ Marking Scheme is wrong dude .. aayi kahan say saali nitrogen =\

 

[MustafaMotani]

we have to assume nothing , nitrogen is present in the air around us. It's common knowledge . No assumption required

did u see that mcQ ??

 

[MustafaMotani]

Answer Nitrogen hai ? Pagal ho kia :\ Marking Scheme is wrong dude .. aayi kahan say saali nitrogen =\

LOL tab he to tum logo se puching

 

[multixamza01]

yea i went on a quick nap to freshen myself up .. =)

For which of the following can graphite be used?
A) as an abrasive only
B as an abrasive and as an electrode
C as an elecrode and as lubricant
D as a lubricant ..

What does abrasive mean ??

i think something related to perfumes , bla bla . just a guess .Answer is C!

 

[rabiafarooq101]

answer is nitrogen first few vapours will be contaminated by air which has 78% nitorgen

 

[syed1995]

we have to assume nothing , nitrogen is present in the air around us. It's common knowledge . No assumption required

abrasive means a material used to scratch something such as we use sandpaper for abrasive purposes...thats wat i think.... the answer in C anyways

its C

Answer tu C hi hai .. aur pta tha .. just wanted to know the meaning of abrasive .. thanks guys

 

[multixamza01]

did u see that mcQ ??

yes

 

[rabiafarooq101]

Answer Nitrogen hai ? Pagal ho kia :\ Marking Scheme is wrong dude .. aayi kahan say saali nitrogen =\

jee nitrogen hai first few will be contaminated by air so ans is nitrogen

 

[MustafaMotani]

answer is nitrogen first few vapours will be contaminated by air which has 78% nitorgen

weLL yeah but I couldnt have guessed dat during the paper