Biology; Chemistry; Physics: Post your doubts here!

[Bhaijan]

Regarding the electricyt quesiton, I think it asked *which* option would conduct electricity, not which one would conduct maximum voltage. So confused..

 

[Dark Destination]

Of course not.

You did 22 for those electrons right? That mcq.

 

[Fate0]

The mcq about burning 1g of carbohydrates, it was the first one, right?

Yup

 

[asadalam]

You did 22 for those electrons right? That mcq.

No i got that wrong i chose 8.

 

[Dark Destination]

No i got that wrong i chose 8.

And which other mcq was a bit tricky?

 

[Dark Destination]

That Potassium Hydrogen sulfate. that was B. equal moles.

 

[DaniyalK]

What did you do for which doesn't produce carbon?

All of the hydrocarbons can produce carbon if they are burned in a very limited supply of oxygen. Carbon monoxide doesn't do that.

 

[Dark Destination]

What was that answer about some white precipitate in MCQs. There were 3 carbonates (and one other - we didn't need that) and I think they had Ag, Pb and one other. What was ans of that?

Calcium cabonate.?

 

[Fate0]

That Potassium Hydrogen sulfate. that was B. equal moles.

Yup

 

[Dark Destination]

So does everyone in the world get an A* in Chemistry?

 

[Dark Destination]

For B10. i wrote the two physical properties of Magnesium Astatide --> High melting point, Soluble in water. Is this right?

 

[Fate0]

So does everyone in the world get an A* in Chemistry?

Inshallah bola karo.

 

[Dark Destination]

That second one is a bit tricky. I went with does not conduct electricity when solid. :/

I was about to write that, but why can't it be soluble in water? Solubility is a physical property?

Whenever we talk about physical properties for ionic compounds, we mention solubility right?

 

[Dark Destination]

Did we have mention anything special in that c'graphy question? I just drew the appratus and told to get teh Rf Values and use them to find amino acids (assuming there is some chart or something that says ____ Rf Value = ______ amino acid)

Ninhydrin spray.

 

[Abdullah Zahid]

i wrote whem molten conducts electricity

 

[Fate0]

Did we have mention anything special in that c'graphy question? I just drew the appratus and told to get teh Rf Values and use them to find amino acids (assuming there is some chart or something that says ____ Rf Value = ______ amino acid)

It's from the PP's.
1) Spot of mixture.
2) Locating Agent
3) RF Value.
4) Compare.

 

[Dark Destination]

Will i get a mark for ''Sugars'' in the carbohydrate question?

Should have written SIMPLE SUGARS :/

 

[Dark Destination]

It's from the PP's.
1) Spot of mixture.
2) Locating Agent
3) RF Value.
4) Compare.

Rf value and compare? I wrote calculate RF value and compare with known readings to identify.

 

[Fate0]

Rf value and compare? I wrote calculate RF value and compare with known readings to identify.

that is what i said ._. i just wrote in a short form.

 

[Dark Destination]

http://nutrition.jbpub.com/resources/animations.cfm?id=7

According to this - ans is monosacchrides. Sugars looks vague.

This isn't Biology, that word is not a part of our syllabus.

And Starch gets Hydrolysed to Maltose by Amylase enzyme, and maltase isn't monosaccharide.

What about REDUCING SUGAR? Some people wrote that :/

Simple sugar was right i should have added one more word. .__.