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Biology; Chemistry; Physics: Post your doubts here!

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In 2,b,ii) how are we supposed to know that iodine is preferentially discharged?Isnt the only one chlorine in our syllabus that can be discharged in stead of oxygen??
 

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In 2,b,ii) how are we supposed to know that iodine is preferentially discharged?Isnt the only one chlorine in our syllabus that can be discharged in stead of oxygen??
Ion with more concentration will get discharged. Simple rule. Applies to Cations and Anions. But our teacher told us only Cl,Br,I.
 
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Guys please tell how to solve these type of question.

26. An aqueous solution of compound X reacts with aqueous sodium hydroxide to form a green precipitate and then aluminium powder is added. The mixture is heated a gas that turns damp red limtus paper blue is given off?
What is X?

A. ammonium nitrate
B. copper (II) cholride
C. iron(II) nitrate
D. iron (III) cholride
 
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Guys please tell how to solve these type of question.

26. An aqueous solution of compound X reacts with aqueous sodium hydroxide to form a green precipitate and then aluminium powder is added. The mixture is heated a gas that turns damp red limtus paper blue is given off?
What is X?

A. ammonium nitrate
B. copper (II) cholride
C. iron(II) nitrate
D. iron (III) cholride

First one is test for Fe+2 ion and the second is test for nitrate ion. So you join the 2 together and answer is C.
 
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