chemistry problem

[wahab305]

Plx help..............

 

[wahab305]

hassam
planet master plz help guys

 

[libra94]

Plx help..............

its D
cuz with hot conc NaOH
NaClO3 is formed and the oxidation state of Cl in this is +5

 

[intel1993]

yeah its D as NaclO3 will be formed from the action of hot con nacl..........

 

[wahab305]

whts the explanation

 

[diwash]

U can check the oxidation no for each reaction. (suppose the chlorine containing compound is Nacl)
(I) AgNo3 + Nacl ------Agcl + NaNo3
Agcl + NH3 ---------(Ag(NH3)2)Cl
here no change in the oxidation no is seen... the oxidation no remains -1 through out the rxn.
(II) H2So4 + Nacl --------Na2So4 + 2HCl
here also the oxidation no of chlorine is unchanged..(ie...-1)
(III)NaoH(cold and dilute)+ Nacl --------Nacl + Naclo +H20 (rxn is not balanced)
here the oxidation no chlorine chages from -1 to +1(naclo) and -1(nacl)
(IV) Naoh(hot and conc) +Nacl -------Nacl + Naclo3 +H2o( rxn not balanced)
here the oxidation no changes from -1 to +5 (Naclo3) and -1 (Nacl)

there fore answer is D
Hpoe this helped

 

[hassam]

yeah.....diwash is ryt..just an inorganic reaction u must have memorised....

 

[wahab305]

thnkxzzzzzzzzzzzzzzzzzzzzzz

 

[DragonCub]

Err, just a little bit issue... The question says "elemental chlorine", does it not mean it should start from zero?

 

[nischal shrestha]

Err, just a little bit issue... The question says "elemental chlorine", does it not mean it should start from zero?

elements always have an oxidation state of 'zero'.

 

[danfriday92]

Guys, please help me! I problem with question 2, 6, 7, 13, 15, 22, 25, 29, paper 11 m/j 2010

Thanks in advance.......

 

[princesszahra]

Plx help..............

its D
for explaination ,open cambridge endrosed book.

 

[Amna]

so it means chlorine goes from an oxidation state of zero to +5. it's getting oxidised. so isn't the easier way for the answer to just look for an oxidising agent? which is hot concentrated NaOH...?