HOW WAS CHEMISTRY PAPER 22 ?

[Idolfanatic95]

0.05 g ? or mg ?

0.05 g

 

[Idolfanatic95]

what was the color change

Blue to brick red/orange

 

[Idolfanatic95]

For that 0.5g of raw medicine should be taken so that the patient gets a dose 0.15mg of zinc.

0.5 or 0.05?g :O

 

[Prawesh Dahal]

Concentration for the 1st ques? Im myself doubtful :s
And ZnO im sure is correct. Not sure about zinc chloride.

I wrote ZnCl2 and Zn(no3)2 that is zinc nitrate..and found out in internet that it DOES react with h2so4 ! ..??? Am i doomed ?

 

[Ansar Khan]

How many "no reactions" were present and which were they among the 6? They were 6 in all right? How many color changes did u guys get? Is there anyone who remembers the first organic reaction?

 

[Idolfanatic95]

I wrote ZnCl2 and Zn(no3)2 that is zinc nitrate..and found out in internet that it DOES react with h2so4 ! ..??? Am i doomed ?

I wrote Zncl2 too but a frnd said as it's itself a salt and above in the reactivity series so it wont react :O

 

[Taci12]

what was the color change

Blue to orange or brick red

 

[switch]

i got 2 colour changes

 

[Ansar Khan]

i got 2 colour changes

Hey switch, did u get orange to green for the first reaction?

 

[switch]

yes I think I did write that

 

[Ansar Khan]

yes I think I did write that

Thanks God, at least someone's with me. Do u remember the first compound? Was it (CH3)3CCHO? It was an aldehyde right? (which was being oxidized to a carboxylic acid)

 

[switch]

I cant remember too clearly what it wa but I did remember that I wrote a colour change from orange to green for one of the reactions , which I think might have been reaction 1

 

[hino]

How many "no reactions" were present and which were they among the 6? They were 6 in all right? How many color changes did u guys get? Is there anyone who remembers the first organic reaction?

the first one was a tertairy alcohol and not an aldehyde,first i got confused too and mistook it for an aldehyde but when i drew its structure i realized that it was a tertairy alcohol
U just got tricked by that CHO in the end of the formula
just draw the structure and you ll know it

 

[arsalan116]

Um no. cuz it was 0.05g :O

sorry sorry ... i mean 50 mg... ab hoga accept ?

 

[Idolfanatic95]

sorry sorry ... i mean 50 mg... ab hoga accept ?

Haha yes hoga

 

[speedy20]

It was quite difficult, the 1st and the 4th question were tough other than that all went well Hope the Gt is low anybody knows the equation when Nh4Cl + H2SO4 react what will be the products i wrote CaCl2 + H2O + NH3 are these correct ?

 

[Ansar Khan]

the first one was a tertairy alcohol and not an aldehyde,first i got confused too and mistook it for an aldehyde but when i drew its structure i realized that it was a tertairy alcohol
U just got tricked by that CHO in the end of the formula
just draw the structure and you ll know it

See I have never seen a compound anywhere which has a CHO in the end and is an alcohol. A CHO in the end always means that the carbon has a double bond with oxygen, indicating that it's an aldehyde. It it were alcohol, it would've been OH then. Btw do you remember the exact formula of the compound?

 

[Idolfanatic95]

It was quite difficult, the 1st and the 4th question were tough other than that all went well Hope the Gt is low anybody knows the equation when Nh4Cl + H2SO4 react what will be the products i wrote CaCl2 + H2O + NH3 are these correct ?

The equation was 2NH4Cl + Ca(OH)2 ----> 2NH3 + 2H2O + CaCl2, no? :O

 

[speedy20]

The compound was tertiary alcohol it was (CH3)3CHO try drawing the structure u will get to know.

 

[Idolfanatic95]

The compound was tertiary alcohol it was (CH3)3CHO try drawing the structure u will get to know.

^Exactly