Chemistry MCQ (Paper 1) Discussion

[rose1700]

it seemed easy but was really tricky atleast for me

by the way what was the answer to the question

What is the purpose of Solution X ?

 

[creative22]

question number 14
in which of the reaction is nitric acid acting as oxidising agent

was the answer (D) please say yes !!!!!!

and

how many electrons were shared in one question

(a) 13
(b) 16
(C) ..
(d) ..

 

[Pals_1010]

The number of electrons i think is 17. Option C

 

[Humaid]

Q1) Then Why did it say in the question that the table is showing the BOILING POINTS of the substances. If the examiners were considering CO2 will sublime then CO2 will not have a boiling point, it will have a SUBLIMATION POINT. So don't this make sense?
What is the use of the Liquid Y in the CO preparation question? I wrote to absorb CO2, will it be correct?

 

[Humaid]

question number 14
in which of the reaction is nitric acid acting as oxidising agent

was the answer (D) please say yes !!!!!!

and

how many electrons were shared in one question

(a) 13
(b) 16
(C) ..
(d) ..

It will be 17 pairs

 

[Humaid]

it seemed easy but was really tricky atleast for me

by the way what was the answer to the question

What is the purpose of Solution X ?

I also want to know the answer for this question

 

[jazzangel16]

Mee 2!!

 

[Pals_1010]

@ Humaid, rose and jazza

i think Solution X is used to absorb the excess C02 that hasn't been converted to carbon monoxide to prevent the mixing of both gases upon collection.

 

[Prince III]

i too wrote the same that it would be used to absorb unreacted Co2 with charchol
but " to prevent water entering back into charchol also seems to be correct "
as CO collect above water would create pressure in the last container , force water to move along the tube in backward direction
and to remove Co2 , water in last container itself would abosrob C02 as CO2 is soluble in water but CO is insoluble

 

[Prince III]

and i think 17 electrons is incorrect , maybe i am wrong
beacuse there was single covalent bond between C - C , the compund was saturated hydrocarbon

this was a repeated question from pastpaper and i dont remember in which year it came

 

[mimmi]

@ Humaid, rose and jazza

i think Solution X is used to absorb the excess C02 that hasn't been converted to carbon monoxide to prevent the mixing of both gases upon collection.

lets see:

H2SO4 + CaCO3 ==> CaSO4 + H2O + CO2

where does the carbon monoxide come from? =S

and i think 17 electrons is incorrect , maybe i am wrong
beacuse there was single covalent bond between C - C , the compund was saturated hydrocarbon

this was a repeated question from pastpaper and i dont remember in which year it came

it should be 17 because it says how many pairs of electrons!

i too wrote the same that it would be used to absorb unreacted Co2 with charchol
but " to prevent water entering back into charchol also seems to be correct "
as CO collect above water would create pressure in the last container , force water to move along the tube in backward direction
and to remove Co2 , water in last container itself would abosrob C02 as CO2 is soluble in water but CO is insoluble

yeah, but i think co2 absorb is the answer they accept cus you know, 1 + 1 can also techincally be 3

 

[Pals_1010]

@ Prince

Mind explaining that bit please?

 

[Prince III]

mimmi =>
it was
CaCO3(s) + HCL (aq) ==== >Ca(cl)2 + H2O + CO2(g)

now charchol is carbon ( C )

Co2 + C ==> 2Co

2 moles of carbonmonoxide

 

[mimmi]

oooh!

 

[basch]

so what is X?:s

 

[jazzangel16]

So whats the final answer to that question?

 

[carolinetcw]

@ Humaid, rose and jazza

i think Solution X is used to absorb the excess C02 that hasn't been converted to carbon monoxide to prevent the mixing of both gases upon collection.

lets see:

H2SO4 + CaCO3 ==> CaSO4 + H2O + CO2

where does the carbon monoxide come from? =S

and i think 17 electrons is incorrect , maybe i am wrong
beacuse there was single covalent bond between C - C , the compund was saturated hydrocarbon

this was a repeated question from pastpaper and i dont remember in which year it came

it should be 17 because it says how many pairs of electrons!

i too wrote the same that it would be used to absorb unreacted Co2 with charchol
but " to prevent water entering back into charchol also seems to be correct "
as CO collect above water would create pressure in the last container , force water to move along the tube in backward direction
and to remove Co2 , water in last container itself would abosrob C02 as CO2 is soluble in water but CO is insoluble

yeah, but i think co2 absorb is the answer they accept cus you know, 1 + 1 can also techincally be 3

i did 13pairs.

 

[alay]

which reaction did nitric acid act as a reducing agent?was it A?

and which reaction wasnt a redox reaction?was it also A?

 

[Humaid]

@ Humaid, rose and jazza

i think Solution X is used to absorb the excess C02 that hasn't been converted to carbon monoxide to prevent the mixing of both gases upon collection.

lets see:

H2SO4 + CaCO3 ==> CaSO4 + H2O + CO2

where does the carbon monoxide come from? =S

and i think 17 electrons is incorrect , maybe i am wrong
beacuse there was single covalent bond between C - C , the compund was saturated hydrocarbon

this was a repeated question from pastpaper and i dont remember in which year it came

it should be 17 because it says how many pairs of electrons!

i too wrote the same that it would be used to absorb unreacted Co2 with charchol
but " to prevent water entering back into charchol also seems to be correct "
as CO collect above water would create pressure in the last container , force water to move along the tube in backward direction
and to remove Co2 , water in last container itself would abosrob C02 as CO2 is soluble in water but CO is insoluble

yeah, but i think co2 absorb is the answer they accept cus you know, 1 + 1 can also techincally be 3

i did 13pairs.

Cant it be to absorb any Hydrogen chloride unreacted?

 

[bamteck]

I prefer Paper 2 and Paper 4 rather than Paper 1..