Chemistry MCQ (Paper 1) Discussion

[carolinetcw]

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

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

both of my answers were also A HAHA.

 

[carolinetcw]

so how many pairs of electrons were shared? CH3COCH3CH2CH2CO ( double bond for last CO )

 

[alay]

pretty sure its 17..haha

 

[creative22]

so how many pairs of electrons were shared? CH3COCH3CH2CH2CO ( double bond for last CO )

the structure was like this nah !
so i also ticked 13 electrons

 

[creative22]

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

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

both of my answers were also A HAHA.

yes CaCo3 ===> Cao + Co2
this was not redox

and for that nitric acid one wasnt the answer D : :geek:

 

[rose1700]

what was answer to the question 39 ?
which organic compounds were similar ?

and the question about extraction of aluminium from electrolysis ?
what was the complete question and answer to it ?

 

[rose1700]

i too choosed 13 electrons

 

[mimmi]

You Guys are forgetting it was asking for pairs of electrons

 

[carolinetcw]

the answer is 13 pairs of electrons!!

 

[rose1700]

what was answer to the question 39 ?
which organic compounds were similar ?

and the question about extraction of aluminium from electrolysis ?
what was the complete question and answer to it ?

answer ths plzz

 

[creative22]

what was answer to the question 39 ?
which organic compounds were similar ?

and the question about extraction of aluminium from electrolysis ?
what was the complete question and answer to it ?

answer ths plzz

statement 2 was the only correct in aluminium question

and dont know for Q.39

 

[alay]

statement 2 is that pure AL is less dense rite?but according to some.an alloy of AL is used

 

[Humaid]

statement 2 is that pure AL is less dense rite?but according to some.an alloy of AL is used

It is an aluminium alloy used

 

[Humaid]

so how many pairs of electrons were shared? CH3COCH3CH2CH2CO ( double bond for last CO )

the structure was like this nah !
so i also ticked 13 electrons

Where are the Hydrogen bonds? with them it will be 17 pairs. Just count the number of lines (bonds) after drawing whole structure

 

[creative22]

statement 2 is that pure AL is less dense rite?but according to some.an alloy of AL is used

It is an aluminium alloy used

humid that was another question

we talking about another

the question which you are talking about is Aluminium used in aicraft manufacture
we are talking abount another question in which three statmemnts were given and we have to tell which were correct

 

[axhynic]

O^-2 ----> O2 + 2 e
2C + 2O2 -----> 2CO2

those two were correct i think

 

[Pals_1010]

@ creative

The molecule seems to be too short. It was a longer one in the paper right?

 

[Pals_1010]

For the electrolysis of aluminium question

Statement 2 and 3 are correct.

As in electrolysis of aluminium, oxygen is produced at the anode. And since the anode is made of graphite(C), it can also burn in the oxygen produced.

 

[jazzangel16]

the answer is 13 pairs of electrons!!

No it is 17

 

[karthik]

why is aluminium used to make airplanes?is it pure AL or an alloy?

it's NOT pure it's in alloy form
i clearly remember my sir said that magnesium is added to aluminium while making aircrafts body to hardened the material because aluminium itself it too light

Well my sir said aluminium is used because its of low density!!!!!!!