Biology; Chemistry; Physics: Post your doubts here!

[A star]

may because to

why KNO3 can not be chosen as a reagent for preparing potassium chloride salt?

link fr qstn pls? kite

 

[A star]

You mean, you made that mnemonic?

no way by my chemistry sir. i meant i posted it.

 

[Dukeofwin]

no way by my chemistry sir. i meant i posted it.

I quoted MustafaMotani quote!
I had no idea you AlSO posted it!
Sorry!

 

[SalmanPakRocks]

Topic people, back on topic.

 

[UziB]

why KNO3 can not be chosen as a reagent for preparing potassium chloride salt?

Since there will be no double displacement, for e.g if you chose to react KNO3 with HCl, the H wont be able to displace K nor will the Cl be able to displace NO3 hence no reaction will take place.

 

[A star]

I quoted MustafaMotani quote!
I had no idea you AlSO posted it!
Sorry!

no problem since you said some one posted it already. i jst said it was me.

 

[A star]

Topic people, back on topic.
View attachment 11042View attachment 11043

5D 31b ihave done it 5 times

 

[SalmanPakRocks]

5D 31b ihave done it 5 times

If I wanted to know the answers, I would have consulted the marking Scheme, Can I be bestowed with an explaination please?

 

[Dukeofwin]

Topic people, back on topic.
View attachment 11042View attachment 11043

5 is C
0.025=25* required/1000

 

[SalmanPakRocks]

5 is C
0.025=25* required/1000

Wrong answer

 

[malay]

why KNO3 can not be chosen as a reagent for preparing potassium chloride salt?

i guess coz both the products formed are soluble
e.g
KNO3(aq)+HCl(aq)--->KCl(aq)+HNO3(aq)
KNo3(aq)+AgCl(s)--->KCl(aq)+AgNO3(aq)
its not suitable as we cant seperate them....
(correct me if m wrong)

 

[Dukeofwin]

Wrong answer

Yeah i know! Hydrogen is Diatomic! So I guess it would be D

 

[A star]

for first 2 mols of h ions in the sulfuric acid so it has double its concentration as it has double the moles of sulphuric acid and for other part iron reacts with oxygen which is 20% od air so 80% left.

If I wanted to know the answers, I would have consulted the marking Scheme, Can I be bestowed with an explaination please?

for first 2 mols of h ions in the sulfuric acid so it has double its concentration as it has double the moles of sulphuric acid and for other part iron reacts with oxygen which is 20% od air so 80% left.happy your highness

 

[SalmanPakRocks]

Yeah i know! Hydrogen is Diatomic! So I guess it would be D

But how to find the concentration of Hydrogen?

 

[A star]

Yeah i know! Hydrogen is Diatomic! So I guess it would be D

will you please tell me how i a wrong?

 

[SalmanPakRocks]

for first 2 mols of h ions in the sulfuric acid so it has double its concentration as it has double the moles of sulphuric acid and for other part iron reacts with oxygen which is 20% od air so 80% left.for first 2 mols of h ions in the sulfuric acid so it has double its concentration as it has double the moles of sulphuric acid and for other part iron reacts with oxygen which is 20% od air so 80% left.happy your highness

Hey Thanks but I didn't get it. You say that the concentration would be doubled? how?
And I got the second part, Thank you.

 

[A star]

But how to find the concentration of Hydrogen?

double of h2so4

 

[SalmanPakRocks]

double of h2so4

Thanks, got it now.

 

[Dukeofwin]

will you please tell me how i a wrong?

Well if you are confident enoguh then you are right to it!
I thought it was C and since i got wrong my next explanation was justa guess!

 

[malay]

Wrong answer

31-B
5-D
?????

 

[A star]

Hey Thanks but I didn't get it. You say that the concentration would be doubled? how?
And I got the second part, Thank you.

double it as 1 mole of h2so4 contains 2moles of H+ ions so 0.025 will contain o.05 moles of ions . 0.05\0.025 will give you the ans of 2