Redox

Question 1

oxidising power of halogens?

Answer 1

F2>Cl2>Br2>I2

Question 2

Relative Oxidising Power

Answer 2

F2>O3>CaOCl2,HOCl/NaOCl,S2O8-2,Bi+5,Pb+4,KMnO4/H+,H2O2,MnO2,K2Cr2O7/H+>Cl2,conc.HNO3,Br2,HNO2,Fe+3,I2,H2O2/OH-

Question 3

Fe+3 + R—->Fe+2.
Here R can be
a)H2O2
b)Na2O2
c)H2O2/H+
d)Na2O2+HCl

Answer 3

a)H2O2 and b)Na2O2

Question 4

Displacement reaction
i)Metal + water(reactivity:Metal>H2)
Na + H2O—->
ii)Metal + acid(reactivity:Metal>H2)
Zn + dil.HCl—->
Cu + dil.HCl—->
iii)Metal(amphoteric) + NaOH
Zn + NaOH—->

Answer 4

i)Na + H2O —>NaOH + H2
ii)Zn + dil.HCl—->ZnCl2 + H2
Cu + dil.HCl—->No reaction
iii)Zn + NaOH—->Na2[Zn(OH)4]

Question 5

Disproportionation
i)Cl2/Br2 + H2O
ii)Heating of -ous acid
H3PO2—->
H3PO3—->
HClO—->
HClO2—->
HNO2—->
H2C2O4—->
H2SO3—->

Answer 5

i)Cl2 + H2O—->HOCl + HCl
Br2 + H2O—->HOBr + HBr
ii) H3PO2—->H3PO4 + PH3
H3PO3—->H3PO4 + PH3
HClO—->HClO3 + HCl
HClO2—->HClO3 + HCl
HNO2—->HNO3 + NO
H2C2O4—->H2O + CO2 + CO
H2SO3—->H2SO4 + S + H2O

Question 6

Disproportionation
iii)Non Metal + NaOH
white P4 + NaOH —CO2->
S8 + NaOH —->Na2S + Na2S2O3
iv)H2O2—->
v)KO2—->

Answer 6

iii) white P4 + NaOH —CO2->PH3 + NaH2PO2
iv) H2O2—->H2O + 1/2O2
v) KO2—->KOH + O2 + H2O2

Question 7

NaOH + Cl2 —>A + NaCl + H2O
cold and dil.
NaOH + Cl2—->B + NaCl + H2O
hot and conc.

Answer 7

NaOCl—Δ—>NaClO3+NaCl
A-NaOCl
B-NaClO3

Question 8

Disproportionation
vi)Na2O2–Δ—>Na2O+O2
KO2–Δ—>K2O+O2
vii)Hydrolysis of p block oxides
NO2—->
P4O6—->
Cl2O6—->
H2S2O6—->
H2P2O6—->

Answer 8

odd group and even OS
even group and odd OS
NO2—->HNO2+HNO3
P4O6—->H3PO4+H3PO3
Cl2O6—->HOCl3+HOCl4
H2S2O6—->H2SO4+H2SO3
H2P2O6—->H3PO4+H3PO3

Question 9

Disproportionation
viii)Heating of Monohalide of group 16
Se2Cl2–Δ—>
ix)Cu+—->
x)Hg2 +2 —LB->
xi)K2MnO4–H+->

Answer 9

viii) Se2Cl2–Δ—>SeCl4 + Se
ix)Cu+—->Cu+2 + Cu
this rxn moves backward in presence of anion which forms insoluble compound of Cu+(I-,NO2-,CN-,SCN-,S2O3-2)
x) Hg2 +2 —LB->Hg+2 + Hg
xi)K2MnO4–H+->KMnO4+MnO2

Question 10

Disproportionation
xii)XeF2 + H2O —->
XeF4 + H2O—->
XeF6 + H2O—->
xiii)XeO3—OH->XeO3.OH- —OH->

Answer 10

xii)XeF2 + H2O —->Xe + O2 + HF
XeF4 + H2O—->Xe + O2 + XeO3 + HF
XeF6 + H2O—->XeO3 + HF
xiii)XeO3—OH->XeO3.OH—OH->XeO6-4 + Xe + O2