IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => IGCSE/ GCSE => Sciences => Topic started by: sameer210394 on October 12, 2009, 04:23:49 pm

Title: Chemistry doubt....
Post by: sameer210394 on October 12, 2009, 04:23:49 pm
th question says....

the reaction shown occurs naturally.

        C6H12O6     ==>      6CO2  +  6H2O
         P                           Q           

which description of P and Q are correct?

        P is a Hydrocarbon               Q is an Acidic Oxide

A             Yes                                      Yes
B             Yes                                       no
C              no                                       Yes
D              no                                        no


I just ticked the option C and the answer was right but i donno how, so ca anybody plz explain be how do u  call Q an acidic oxide???

Thanks in advance...
Title: Re: Chemistry doubt....
Post by: nid404 on October 12, 2009, 04:27:37 pm
Well, hydrocarbons consist of only C and H atoms...so hence glucose is not hydrocarbon.....CO2 is acidic should be known :P....CO2 forms carbonic acid in soln...it's an acidic oxide...cummon dude
Title: Re: Chemistry doubt....
Post by: Ghost Of Highbury on October 12, 2009, 05:18:37 pm
yeah..that was correct...

as nid said..CO2 forms carbonic acid

metal oxides forms an alkali when dissolved in water

and non-metal oxides form acid..
so..yaeh..C is a non-metal..so

the answer is C

@nid - he has taken combined science dude...not pure chem/phy/bio
Title: Re: Chemistry doubt....
Post by: nid404 on October 12, 2009, 05:19:46 pm
oh ok....
Title: Re: Chemistry doubt....
Post by: Ghost Of Highbury on October 12, 2009, 05:27:05 pm
Quote from: sameer210394 on October 12, 2009, 04:23:49 pm
th question says....

the reaction shown occurs naturally.

        C6H12O6     ==>      6CO2  +  6H2O
         P                           Q           

which description of P and Q are correct?

        P is a Hydrocarbon               Q is an Acidic Oxide

A             Yes                                      Yes
B             Yes                                       no
C              no                                       Yes
D              no                                        no


I just ticked the option C and the answer was right but i donno how, so ca anybody plz explain be how do u  call Q an acidic oxide???

Thanks in advance...

guess u 4got to add O2 in the reactants side... :P
Title: Re: Chemistry doubt....
Post by: nid404 on October 12, 2009, 05:28:10 pm
haha...even i didn't notice it
Title: Re: Chemistry doubt....
Post by: sameer210394 on October 12, 2009, 05:39:37 pm
Quote from: ~Am~ on October 12, 2009, 05:27:05 pm
guess u 4got to add O2 in the reactants side... :P

eh ya.  :P