Last minute preparation on MCQS 9701 and 9702. Discussion here.

[The Sarcastic Retard]

View attachment 57340
Ans is C..how?

P : Bond breaking is endothermic, from data, Br - Br Bond breaking energy is +193kj/mol
Q : Bond forming is exothermic, from data, Cl2 bond forming energy is -244kj/mol
R : Its exothermic as CH3Cl is formed, from data, CH3Cl bond forming energy is - [(410*3) + (340)] = -1570kj/mol
S : Breaking hence endothermic, from data, bond breaking energy of CH4 is 410*3 + hydrogen.

Hence from most -ve to most +ve order is : R -> Q -> P -> S

 

[SadiaMaryam]

Answer is D but I can't find 17th and 18th hydrogen. Can anyone else?

 

[SadiaMaryam]

What the hell is this question? someone explain it plz

 

[SadiaMaryam]

I can understand the first two statements.
But how do I know whether it'll react with NaHCO3 to give CO2???

 

[The Sarcastic Retard]

View attachment 57367
Answer is D but I can't find 17th and 18th hydrogen. Can anyone else?

Here you go.. ^_^

 

[The Sarcastic Retard]

View attachment 57369

I can understand the first two statements.
But how do I know whether it'll react with NaHCO3 to give CO2???

carbonates reacts with acid to give CO2 leaving the acid salt of the original carbonate salt.

 

[The Sarcastic Retard]

View attachment 57368

What the hell is this question? someone explain it plz

I was not sure of this as I was never been taught a thing like this in ma classes and my teacher says its part of A2.
Though go to youtube, type "9701 chemistry June 2015 , Paper 1_2" And search your question in the playlist. Its of meta tutor..
Like now I know it, but all credit goes to this guy Metanoia
Here is the link. Go directly to 2 minutes 40 seconds. ^_^

 

[SadiaMaryam]

I was not sure of this as I was never been taught a thing like this in ma classes and my teacher says its part of A2.
Though go to youtube, type "9701 chemistry June 2015 , Paper 1_2" And search your question in the playlist. Its of meta tutor..
Like now I know it, but all credit goes to this guy Metanoia
Here is the link. Go directly to 2 minutes 40 seconds. ^_^

Thanks alot for the links and all the answers...I got it now.

 

[shahzaib9291]

 

[The Sarcastic Retard]

View attachment 57379

I know the answer so directly doing it.
We know mass of gas that is O2 plus a metal oxide, so finding moles of them and add their masses would be a longer procedure so we do like, 3 - 1.53 = 1.47g of solid left.
So as answer is D :
moles of Sr(NO3)2 = 3/(211.6) = 0.014 mol
1 mole of it gives one mole of solid hence mass of solid : (87.6 + 16) * 0.014 = rounds up to 1.47g.

 

[shahzaib9291]

 

[The Sarcastic Retard]

View attachment 57388

Kp = P(CO).P(H2O) / P(H2).P(CO2)
Let P(CO) and P(H2O) = x as both will be same.
Hence,
0.288 = x^2 / 10000^2
x = A

 

[shahzaib9291]

Kp = P(CO).P(H2O) / P(H2).P(CO2)
Let P(CO) and P(H2O) = x as both will be same.
Hence,
0.288 = x^2 / 10000^2
x = A

thanks bro

 

[shahzaib9291]

 

[awesomaholic101]

View attachment 57389

Ans: B

2Propan-1-ol + 9O2 ---> 6CO2 + 8H2O
So, 0.1 mol of propanol will react with only 0.45 mol of O2 leaving 0.05 mol of O2
It will form 0.3 mol of CO2 and 0.4 mol of H2O

At room temperature, only O2 and CO2 are gases ... therefore, volume of gas present = (0.05+0.3)*24 = 8.40 dm^3

 

[shahzaib9291]

how are all correct?

 

[SadiaMaryam]

how are all correct?
View attachment 57393

1. H2SO4 is donating a proton to H2NO3+
2. H2SO4 is donating two protons to H2O
3. H2SO4 s donating two protons to Mg

 

[shahzaib9291]

1. H2SO4 is donating a proton to H2NO3+
2. H2SO4 is donating two protons to H2O
3. H2SO4 s donating two protons to Mg

Got it
Thanks

 

[The Sarcastic Retard]

Answer is, IDK
A?

 

[The Sarcastic Retard]

Again answer to this question is simple That is IDK
D?