, NCERT & NCSRT Mock Registry
Comprehensive Exam || With
Questions & All Correct Solutions
(Graded A+)
Oxygen formation - ANSWER - 2KClO3—>2KCl+3O2
2KMnO4—>K2MnO4+ MnO2+ O2
2NaNO3—>NaNO2+O2
2Ag2O—-> 4Ag+O2
2H2O2—>2H2O+O2
Electrolysis of H2O to give H at cathode and O2 at anode
2SO2+O2->? Contact process - ANSWER - 2SO3(V2O5 catalyst)
4HCl+O2—>? Deacons process - ANSWER - 2Cl2+2H2O(CuCl2)
Tailing of mercury equation . How to detect presence of O3? - ANSWER - 2Hg+ O3
—> Hg2O+O2
Sticks to the glass as it loses its upper miniscus
O3 presence detected by
2Ag+O2—> Ag2O+O2
Silver turns to black
,Reduction ozonalysis - ANSWER - Unsat comp in the presence of O3 or Zn+H2O
convert to aldehyde or ketone
Helps in the location of unsaturation
Br2/CCl4 Bayers reagent
Ozone depletion
NO+O3—> - ANSWER - NO2+O2
3Fe+3H2O—->
2Fe+2H2O—-> - ANSWER - 6HF+O3
4HF+O2
2SO2+O3—-> - ANSWER - 2SO3
Here ozone is completely consumed
* ozone bleaches through oxidation or reduction? - ANSWER - Oxidation
S8 sulphur structure properties - ANSWER - Crown sturcture
Puckered ring structure
OS of S =o
Soluble in CS2
8 SS bond
Bond angle 107
Bond length 204pm
Transition temperature of sulphur structures - ANSWER - 369K
At elevated temperature,S8 gives what? - ANSWER - S2 which is paramagnetic and
has similar properties to that of O2 due to unpaired electrons in the pi* AB shell
S6 structure properties - ANSWER - Engles sulphur
OS of sulphur =o
Covalency =2
Sssbond angle= 102
Bond length= 205.7pm
Detection of SO2 - ANSWER - SO2 decolorises KMnO4 solution
Violet purple to colourless
SO2 bleaches through - ANSWER - Reduction ( exception)*
SO2 is formed in which exited state and SO3 is formed in which exited state? -
ANSWER - 1st and 2nd exited state respectively
H2SO4 formation by contact process ( 3steps) - ANSWER - 1. S+O2 —> SO2
2.2SO2+O2->2SO3(V2O5) delta H=-ve
3. 2SO3+H2O—> H2SO4 not economical
2SO3+H2SO4->H2S2O7 oleum
H2S2O7+ H20-> H2SO4 (96-98%pure)
Le chatelier condition on formation of H2SO4 - ANSWER - Optimum temp and
pressure
720K and 2atm
Parts of the H2SO4 manufacturing machine - ANSWER - 1. Sulphur burner
S+O2-> SO2
2. Dust precipitator
Ppts the dust
3. Washing tower
Gases are washed using H2O
4. Drying tower
Gases are dried used con H2SO4
5. As purifier
As is purified and removed by gelatinous Fe2O3.xH2O
6. Preheat
Gases are heated to 720K
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