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Will any one help me .... paper with which code is for Pakistan !! 21 or 22 and 11 or 12 ....... Help me please !!
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22 and 12Will any one help me .... paper with which code is for Pakistan !! 21 or 22 and 11 or 12 ....... Help me please !!
Metal always deposited at the cathode.Whereas at Anode, the gas liberated.The Potassium is in the top in reactivity series, so it readily discharge at the cathode.what products are formed in electrolysis of aq. KBr ? can anyone explain with ref to reactivity series? Im confused about the Anode part
Haha thanks a lot for your answerBasically it means that if u add water before adding ethanol you would have observed an emulsion straight away and hence it is required u add ethanol first or else u will get the emulsion also it says that by convention u add ethanol first the more lame it looks it is the correct answer and dont be surprised to find more lame answers in MS for Bio ATP they really think bio students are too stupid and hence such answers are seen
these wernt the answers!!!! IN MARKS SCHEME liquid bromine and hydrogen gas was the answer...Metal always deposited at the cathode.Whereas at Anode, the gas liberated.The Potassium is in the top in reactivity series, so it readily discharge at the cathode.
At anode reddish bromine gas liberated
yes potassium is more stable as an ion so it wont discharge , and H+ being less reactive will be discharged. Bromide is less reactive then hydroxide and will therefore discarge.these wernt the answers!!!! IN MARKS SCHEME liquid bromine and hydrogen gas was the answer...
Metal always deposited at the cathode.Whereas at Anode, the gas liberated.The Potassium is in the top in reactivity series, so it readily discharge at the cathode.
At anode reddish bromine gas liberated
Back to chemistry class papajohn.
Bromine is a liquid at rtp , not a gas and would be discharged at cathode. Potassium will NEVER be discharged in its aqueous solution, let alone readily. Your answering questions wrong. I appreciate your will to help but don't misguide people.
Metal always deposited at the cathode.Whereas at Anode, the gas liberated.The Potassium is in the top in reactivity series, so it readily discharge at the cathode.
At anode reddish bromine gas liberated
yes potassium is more stable as an ion so it wont discharge , and H+ being less reactive will be discharged. Bromide is less reactive then hydroxide and will therefore discarge.
Just keep the reactivity series in mind. The less reactive elements discharge in preference to the more reactive ones.
If you didn't understand , let me know i can explain in more detail.
But it also depend on these:i do know about preferential discharge but i thought the series for anions was
OH- I- Br- Cl- NO3- SO4-2 F-
with hydroxide being least reactive........... so it should discharge in preference to halogens
But it also depend on these:
Concentration of ion
Nature of electrode
When the question doesnot mention whether the solution is dilute or concentrated ; assume it to be concentrated.the question in past papers simply said "Aqueos KBr" how am I supposed to know its conc. and exam report also said that most candidates got this ques wrong so whose faullt..........???
Dont worry people its good u get ur mistakes now or else it will be a really hard lesson to learn, keep revising chemistry,bio and physics at least fortnightly you will eventually even start remembering the minor details and dont rote learn please try understanding it will even come good in A Levels
hey thanks for the tipWhen the question doesnot mention whether the solution is dilute or concentrated ; assume it to be concentrated.
This is a rule made by CIE.
i guess v have to assume it as dilute! :-/ cx cncntrated gives the same result as molten! so if aqueous is given, it shld b taken as dilute
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