How was paper went of CHEMISTRY 5070/22

[Syed Mirak]

It was zinc metal , Mentioned in chemistry matbook! book

which question are u talking about ? zn +hcl?

 

[Syed Mirak]

and what about that question, the group or compound that makes carbohydrate?
i wrote alcohol group.

i wrote alcohol too but the majority says it was "glucose" or "disaccharides"

 

[Laibaaa]

Wow. After discussing, I made such stupid mistakes, not good. :/
For Magnesium astatines property, i wrote forms colourless compounds :/

 

[Rida Zahra]

i wrote alcohol too but the majority says it was "glucose" or "disaccharides"

it should be alcohol,i think. Perhaps,they will correct both disaccharides and alcohol.

 

[fazlovelfc]

Alcohol hi tha!

 

[asadalam]

I thought there would be one mark for

- Double bonds/Multiple bonds.
- In a number of places/ many.

2 marks.

But now you're saying we had to mention between CARBON ATOMS :/

We had to.Simple double bond doesnt decolorise bromine water.Carbon to Carbon double bonds are necessary.

 

[Syed Mirak]

what was the answer to the question
which of the following doesn't produce carbon on combustion ?

 

[asadalam]

Alcohol hi tha!

No,hydrolysis splits the condensation polymers into their respective monomers,i.e Proteins give Amino acids,fats give fatty acids and glycerol.Likewise Carbohydrates give simple sugars or more precisely di or mono saccharides.You are confusing it with fermentation of carbohydrate which would give Alcohol

what was the answer to the question
which of the following doesn't produce carbon on combustion ?

CO

 

[Ruman Wajih]

moreover there was a mcq in which we had to tell that which factor will affect the rate and equilibirium in haber process of ammonia. i wrote C that adding catalyst and increasing pressure. is it right ?

 

[M.Omar]

No, it was the REACTION between calcium hydroxide and acid in the soil. You could have taken any acid into consideration for the reaction to give the ionic equation!

Wht was the question exactly?..was it ionic equation for the reaction(CaOH2 +ammonium phosphate) or neutralization reaction

 

[Proud otaku]

Well that makes ABSOLUTELY NO SENSE AT ALL.Francium is below caesium in any case.
We had to divide 400 by 24000 to obtain moles.Then multiply them by 2 to obtain moles of the metal.Then divide mass(0.233) with moles 0.333 which gave us the answer 6.99 which can be rounded off to 7.

7 is the Ar of Lithium so that was the answer.

Okay, now you may kill me. please.

 

[Proud otaku]

It asked which of them wud react to NOT produce carbon if m not wrong. So I chose the alcohol as it reacts with oxygen to produce carboxylic acid which isnt carbon but then again it said 'combustion' so m not really sure... What did you write Proud otaku ?

Really it does always happens to me. TT^TT
Oh and I wrote CO cos I read in the book that alcohol also have combustion so the only option left was CO xD

 

[Proud otaku]

me too

Awla! I hope it's right.

 

[Proud otaku]

YAAR IS DAFA PAPER AASAAN THA NA? (MAGGAR MAIN NAY JO BONGIYAAN MARI HAIN US SAY MERA KUCH NAI HO SAKTA.) TO IS BAR KIA HO GA? % HIGH YA LOW?

 

[Hamza Roxx]

Please tell me that electrolysis MCQ in which a lamp was given and was asking that in which of the following options does the lamp lights...????

 

[Sarmad Saeed]

Any idea what marks were for carbohydrates part and others related to it??

ALCOHOL likha hai maine

 

[Ram97]

Please tell me that electrolysis MCQ in which a lamp was given and was asking that in which of the following options does the lamp lights...????

It was D with H2So4 as electrolyte
old past paper qs

 

[Hamza Roxx]

Thnx! wht a sigh of relief.......

 

[Proud otaku]

It was D with H2So4 as electrolyte
old past paper qs

AWW HELL YES!!!!!!!! I DID THE SAME XD

 

[sid2333]

D

Please tell me that electrolysis MCQ in which a lamp was given and was asking that in which of the following options does the lamp lights...????