Question

12. Which of the following are redox reactions? Name the reducing agent in each redox reaction.
a) H2 + Cl2 → 2 HCl
b) 2Li + F2 →2LiF
c) 2NaOH + H2SO4 → Na2SO4 + 2H2O
d) Fe2O3 + CO → Fe + CO2

Answer 1

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Answer 2

Do you know how to find oxidation states of element??

Answer 3

tell me what you do know about redox reactions so that i get the idea and help you out in solving this question :)

Answer 4

r u there?

Answer 5

yes

Answer 6

alright so what do u want me to explain? do u know whats redox reaction?

Answer 7

redox reaction involves transfer of electrons

Answer 8

i don't know how to work out the answers

Answer 9

can you show me how to do the first one, and i'll try and learn from that

Answer 10

yes, basically its oxidation and reduction reaction taking place in 1 reaction

Answer 11

sure :)

Answer 12

alright here is first reaction
H2 + Cl2 → 2 HCl

Answer 13

can u tell me what's H2's and Cl2's oxidation states?

Answer 14

i kinda forgot how to do that :(

Answer 15

okay np :)

Answer 16

would you mind explaining how to find

Answer 17

when the element is given on its OWN meaning alone, whether its Cl2 or Na or whatever its oxidation state would be 0

Answer 18

okay

Answer 19

so if u were given hmm lets say O2 what would be its oxidation state?

Answer 20

so H2 and CI2 is 0

Answer 21

0

Answer 22

yes :)

Answer 23

good next we go to product which is
2 HCl

Answer 24

so if its NaCl it wouldn't be 0

Answer 25

no no no

Answer 26

yup

Answer 27

i said ELEMENT not compound

Answer 28

NaCl is compound and consists of 2 elements Na and Cl thus both would have oxidation states of something
when Na or Cl2 are given alone only at that time oxidation state is 0

Answer 29

so when would its oxidation state be not 0

Answer 30

okay

Answer 31

good :)
so now we look at HCl

Answer 32

yup

Answer 33

HCl is a compound thus each element in it would have its oxidation state

Answer 34

ok

Answer 35

now u actually CAN say that oxidation state would be 0
i'll show how

Answer 36

okie

Answer 37

when i say 0 i mean TOTAL of oxidation states of all element IN a compound is = 0

Answer 38

okay

Answer 39

so as you see HCl doesn't have any specificity in its total oxidation state meaning it doesn't look like this
\[HCl ^{-}\] or something like that

Answer 40

yup

Answer 41

as long as a compound does not have this it's total oxidation state will always be 0
same goes to element alone actually
so if Cl is not given as just Cl2 or Cl
but it's given like this \[Cl ^{-}\] its oxidation state would be -1

Answer 42

not 0 :)

Answer 43

yup

Answer 44

so now lets see whats oxidation state of each element in HCl compound

Answer 45

there some elements that have ALWAYS same oxidation state
H is one of them
and its oxidation state in a compound is ALWAYS +1

Answer 46

get it?

Answer 47

yes :)

Answer 48

ok
so lets see
we said that total oxidation state of a compound would be 0
and we know oxidation state of H which is +1
so we can write it in a mathematical form

(+1) + X = 0

X is representing oxidation state of Cl

Answer 49

so what would be X oxidation state? solve it :)

Answer 50

-1

Answer 51

bingo :)

Answer 52

would it be 0, since x = 0/1 ?

Answer 53

no no
look
(+1)+X = 0
its ADDITION not multiplication thus
+1+X= 0
X= 0-1
X= -1

Answer 54

i wasn't sure due to the brackets

Answer 55

i understand it now :)

Answer 56

i wrote bracket so that u see that it was oxidation state lol

Answer 57

coz it was +1 right?

Answer 58

yep

Answer 59

okay now
H2 oxidation state before the reaction was 0
and Cl2 oxidation state before reaction is 0

Answer 60

yes

Answer 61

now we found H and Cl's oxidation states AFTER reaction in a compound
what are they?

Answer 62

+1 and -1

Answer 63

good so for H2 u see change from 0 to +1
for Cl2 u see change from 0 to -1

Answer 64

yup

Answer 65

negative sign means GAIN of electron
positive sign means LOSS of electron right?

Answer 66

right

Answer 67

when something GETS OXIDIZED it will gain electron
and when something GETS REDUCED it loses electron

Answer 68

yeah

Answer 69

now question DO YOU SEE BOTH happening?

Answer 70

yes

Answer 71

0 to +1 meaning Loses 1 electron
0 to -1 meaning gains 1 electron

Answer 72

so both oxidation and reduction happen in this 1 reaction right?

Answer 73

right

Answer 74

now their question is
ame the reducing agent in each redox reaction.

Answer 75

name*

Answer 76

so the first one question is a redox reaction

Answer 77

yes it is :)

Answer 78

so whats the reducing agent?

Answer 79

OIL RIG
Oxidation is loss of electron, this electron is LOST by the thing that is being oxidized
Reduction is gain of electron, this electron is gained by the thing that is being reduced



so that means OXIDIZING agent would Gain electron
and REDUCING agent would Lose electron

Answer 80

Cl2 is the reducing agent then?

Answer 81

So in other wards Oxidizing agent - OXIDIZED OTHER AND REDUCES ITSELF
meaning oxidized compound/element would LOSE electron and oxidizing agent would take that electron Thus get reduced

Answer 82

we said Reducing agent LOSES electron

Answer 83

Cl2 is changing form 0 to -1 meaning it GAINS electron

Answer 84

do u get it??

Answer 85

oh okay so its H2

Answer 86

yup :)

Answer 87

Thanks for all your help, you explain really well!! Your Amazing :)

Answer 88

you are welcome :))
i just want to confirm if u got everything
maybe lets do other equation? just to check out

Answer 89

sure :)

Answer 90

2Li = 0

Answer 91

F2=0

Answer 92

2LiF = 0

Answer 93

okay i was gonna suggest doing the hard one but ok finish this one

Answer 94

will do the hard one

Answer 95

nah finish this one first :)

Answer 96

is Q C or D the difficult one?