Oxidation and reduction Flashcards
All redox reactions are:
exothermic
can fluorine give a disproportionate reaction?
No
because it is the strongest oxidizing element
mnemonic for oxidation and reduction is ;)
LEOGER
electrolysis is a redox reaction in which
oxidation takes place at anode
reduction takes place at cathode
lewis acids are
oxidants
lewis bases are
reductants
reduction property …………. down the group
increases
oxidation property …………. down the group
decreases
starch iodine paper is used for
test the presence of an oxidizing agent
where starch is the one who works
the oxidation state of +8 is shown by
Ruthenium and osmium
The oxidation number is zero in
- allotropes
- alloys
- metals of metal carbonyls
- free state
- amalgam
The bleaching action of chlorine is
oxidation and is permanent
bleaching action of SO2 is
reduction and temporary
Oxidation number of Mg in chlorophyll is
+2
Oxidation number of iron in haemoglobin is
+2
The oxidation number of iron in methemoglobin is
+3
increase in O.N makes the radii
decrease
decrease in O.N makes the radii
increase its size
O.N of basic compounds is
less than oxidation number of amphoteric compounds which is inturn less than the oxidation number of acidic compounds
the thermal stability of oxyacids:
increases with the increase in oxidation number
the oxidation number of hydrogen is +1 in all cases except in :
metal hydrides that has -1 oxidation state
non-metals that are reducing agents:
carbon, sulphur, hydrogen
Schweitzer reagent is used for the manufacturing of artificial silk. its molecular formula is
[Cu(NH3)4] SO4
also known as tetramine copper sulphate
the strongest reducing agent is
lithium in solution and cesium in air
the strongest oxidizing agent is
Flourine
compounds that act as reducing as well as oxidizing agents are
H2SO3
HNO2
SO2
H2O2
increase in O.N means:
increase in acidity
The highest electrical conductivity of the following aqueous solutions is of
(1) 1 M acetic acid
(2) 1 M chloroacetic acid
(3) 1 M fluoroacetic acid
(4) 1 M difluoroacetic acid
More the acidity more will be the tendency to release protons. So lighter will be the electrical conductivity. Difluoroacetic acid will be the strongest acid because of the electron-withdrawing effect of two fluorine atoms so it will show maximum electrical conductivity.
Hence option (4) is the answer.
Amount of oxalic acid present in a solution can be determined by its titration with KMnO4 solution in the presence of H2SO4. The titration gives unsatisfactory result when carried out in the presence of HCl because HCl
(1) gets oxidised by oxalic acid to chlorine
(2) furnishes H+ ions in addition to those from oxalic acid
(3) reduces permanganate to Mn2+
(4) Oxidises oxalic acid to carbon dioxide and water
HCl is a strong reducing agent. It reduces permanganate to Mn2+.
Hence option (3) is the answer.
