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well was just going through the past posts and wanted to correct you. The brown color is due to the bromine ion being oxidised to bromine. The bromine ion does not have a color, so the brown is due to the bromine molecules produced after oxidation
for the MCQ 4 my guess is C because the aluminium is most reactive of all requires more energy sorry if i am wrong
its B because the sulphate ions CAN NEVER be discharged so always oxygen will be produced at the positive electrode.
I've heard that even teachers aren't sure what the answer is to this one. I'll go with A because we have to note "ALWAYS TAKES PLACE" which means that we might even be using Copper electrodes. In every case, copper is deposited. For some reason, no one seems to bother thinking about the copper electrodes where the anode dissolves.
if abt 5 then its D because copper never reacts with dilute acid
The answer is B. In the question, it is specified that we have to reuse the same titration flask, but the next reaction for which we have to reuse the flask has not been mentioned. For this, we rinse with tap water and then with distilled water.
Any body help me with this question. With explanation please! 
HCl breaks up into ions in aqueous solution so it conducts electricity only in aqueous solution. So, HCl is X.AView attachment 27143Any body help me with this question. With explanation please!
The answer would be A. In concentrated aqueous solutions, the most reactive cations do not discharge(K, NA, CA). Instead, The H+ ion discharges.
we do these reactions to make insoluble salts. If we need to make an insoluble salt, we will need to have two soluble salts, one with the cation of the required salt and the other with the anion of the required salt. E-g lets say we need to make Silver Chloride, an insoluble salt. We will need two soluble salts to prepare this, one with the cation Silver and the other with the anion Chloride. They must both be soluble too. So, I'll take Silver Nitrate, and the other soluble salt, NaCl. They both need to be soluble. Putting them in water would result in the following reactionCan sum1 xplain everything about double displacement reactions?
Potassium, Sodium and Calcium; Magnesium reacts slowly with water but vigorously with steam.
What do they form? Does copper react with them?what about caesium? What do they form?
Copper doesn't react at all with water neither does silver.
Please answer this too.
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