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26351.

The oxidation potential of a hydrogen electrode at pH=10 and pH_(1)=1

Answer»

0.059V
0.59V
0.00V
0.51V

Solution :`E_(OP)=E_(OP)^(o)-(0.059)/(1)"LOG"([H^(+)])/(P_(H_(2)))`
`therefore[H^(+)]=10^(-10),P_(H_(2))=1ATM,E_(OP)=0.59V`
Discussion
26352.

The oxidation potential of a hydrogen electrode at pH =10 and P_(H_2) = 1 atm

Answer»

`0.51 V`
`0.00V`
`+0.59V`
`0.059V`

ANSWER :C
Discussion
26353.

The oxidation potential of 0.05 MH_(2)SO_(4) is

Answer»

`-2 XX 0.0591`
`-0.01xx0.0591`
`-2.321xx0.00591`
`+1xx0.0591`

ANSWER :D
Discussion
26354.

The oxidation potential is the tendency of an electrode to

Answer»

INACTIVE electrode
get reduced
gain electrons
loss electrons

Solution :DEFINATION of OXIDATION POTENTIAL.
Discussion
26355.

The oxidation of which of the following compounds with KMnO_(4),overset(Theta)OH//Delta followed by treatement of acid will give benzoic acid ?

Answer»

`C_(6)H_(5)CH_(3)`
`C_(6)H_(5)CH=CH-CH_(3)`
`C_(6)H_(5)C-=C-CH_(3)`
`C_(6)H_(5)-OVERSET(O)overset("||")C-CH_(2)OH`

ANSWER :A::B::C::D
Discussion
26356.

The oxidation of unsymmetrical ketone is governed by ..............

Answer»

SOLUTION :Popott.s RULE
Discussion
26357.

The oxidation of SO_(2) to H_(2)SO_(4) in acid rain is thought to occur by the following mechanism. SO_(2)(aq)+2H_(2)O(l) rarr HSO_(3)^(-)(aq) +H_(3)^(+)(aq) 2HSO_(3)^(-)(aq) +O_(2)(aq)rarr S_(2)O_(7)^(2-)(aq)+H_(2)O(l) S_(2)O_(7)^(2-)(aq) +3H_(2)O(l) rarr 2SO_(4)^(2-)(aq)+2H_(3)O^(+)(aq) Which species in this mechanism can be given the following designation?

Answer»

`{:("Reactant","catayst","INTERMEDIATE"),(SO_(2)(AQ),H_(2)O(l),HSO_(3)^(-)(aq)H_(3)O^(+)(aq)):}`
`{:("Reactant","catayst","Intermediate"),(SO_(2)(aq),HSO_(3)^(-)(aq),S_(2)O_(7)^(2-)(aq)):}`
`{:("Reactant","catayst","Intermediate"),(SO_(2)(aq)H_(2)O(l),S_(2)O_(7)^(2-)(aq),HSO_(3)^(-1)(aq)):}`
`{:("Reactant","catayst","Intermediate"),(SO_(2)(aq)H_(2)O(l),"none",HSO_(3)^(-)(aq)S_(2)O_(7)^(2-)(aq)):}`

Answer :D
Discussion
26358.

The oxidation of SO_2 by O_2 "to" SO_3 is an exothermic reaction. The yield of SO_3 will be maximum, if

Answer»

temperature is INCREASED and PRESSURE is KEPT constant
temperature is REDUCED and pressure is increased
both temperature andpressure are increased
both temperature and pressure are reduced

Answer :B
Discussion
26359.

The oxidation of thiosulphate ion by iodine gives:

Answer»

`SO_3^(2-)`
`SO_4^(2-)`
`S_2O_8^(2-)`
`S_4O_6^(2-)`

ANSWER :D
Discussion
26360.

The oxidation of toluene to benzaldehyde by chromyl chloride is called

Answer»

CANNIZZARO reaction
Wurtz reaction
Etard reaction
Reimer-Tiemann reaction

Solution :
Discussion
26361.

The oxidation of potassium iodide by potassium persulphate as per the rate law, rate k[K_(2)S_(2)O_(8)][Kl]. The order with respect to potassium iodide is ___________

Answer»

TWO
ONE
THREE
four

Answer :B
Discussion
26362.

The oxidation of phenol with chromic acid gives....

Answer»

a SIMPLE DIKETONE.
a CONJUGATED diketone.
ortho benzoquinone.
an aldehyde.

Solution : a conjugated diketone.
Discussion
26363.

The oxidation of phenol in presence of alkaline per-sulphate solution is …….

Answer»

1,4-Benzoquinone
HYDROQUINONE
Catechol
Resorcinol

Solution :Hydroquinone
Discussion
26364.

The oxidation of naphthalene in presence of catalyst Hg//H_(2)SO_(4) to Phthalicacid. How many moles of SO_(2) is formed ? (CO_(2) evolved)

Answer»


Solution :`underset("NAPHTHALINE")(C_(10)H_(8)+9H_(2)SO_(4)) overset(HG)to underset("pnthalic acid")(C_(8)H_(6)O_(4)+H_(2)O) +9SO_(2)+2CO_(2)`
Discussion
26365.

The oxidation of oxalic acid by acidified KMnO_4 becomes fast as the reaction progresses due to :

Answer»

Auto CATALYSIS by `Mn^(2+)`
PRESENCE of `SO_4^(2-)`
Presence of `K^+`
Presence of `MnO_4^(-)`

Answer :A
Discussion
26366.

What is the net gain of ATP molecules in Glucolysis ?

Answer»

36
12
18
28

Answer :A
Discussion
26367.

The oxidation of isobutane with alk. KMnO_(4) gives d:

Answer»

`CO_(2) and H_(2)O`
isopropene
tert-butyl ALCOHOL
butanoic acid

Solution :NORMALLY ALKANES resist the action of ALK. `KMnO_(4)`. But alkanes containing a `3^(@)` H-atom can be oxidised to alcohol.
Discussion
26368.

The oxidation of central atom in the complex[ Co(NH_(3))_(4) CINO_(2)] is

Answer»

` +2`
`+3`
`+1`
ZERO

ANSWER :A
Discussion
26369.

The oxidation of benzyl chloride with lead nitrate gives

Answer»

BENZYL alcohol
Benzoic acid
Benzaldehyde
p-chlorobenzaldehyde

Answer :C
Discussion
26370.

The oxidation of aniline with K_(2)Cr_(2)O_(7) //H_(2)SO_(4) produces mainly

Answer»

<P>Nitrobenzene
Benzoic ACID
`p-`BENZO quinone
Benzamide

Solution :
Discussion
26371.

The oxidation of a certain metal is found to obey the equation A^(2)=alpha t+beta, where A is the thickness of the oxide film at time t, alpha and beta are constants. The order of this reaction is

Answer»

0
1
-1
2

Solution :`A^2=alpha t + BETA`
Differewntiating this equastion . We get
`2AdA=alpha.dt"or"(DA)/(dt)=alpha/(2A)=alpha/2=[A]^(-1)`
Hence, ORDER or reaction= - 1. ltbvgt `(d[A])/(dt)` represents the rate of INCREASE of thickness of OXIDE filim with time.
Discussion
26372.

The oxidation number that iron does not exhibit in its common compounds or in its elemental state is :

Answer»

ZERO
`+1`
`+2`
`+3`

Answer :B
Discussion
26373.

The oxidation number of xenon in XeOF_(2) is

Answer»

Zero
2
4
3

Solution :Suppose the oxidation state of Xe is X. `XeOF_(2)`
x + (-2) + 2(-1) =0 `RARR ` x-2-2=0 `rArr` x=4.
Discussion
26374.

The oxidation number of the metal in Zeisel's salt is

Answer»


SOLUTION :`K[PtCl_3(C_2H_4)] RARR PT (II)`
Discussion
26375.

The oxidation number of sulphur in S_8,S_2,F_2,H_2S respectively are :

Answer»

0, + 1 and -2
`+2 , + 1 and -2`
`0, + 1 and + 2`
`-2, + 1 and- 2`

ANSWER :A
Discussion
26376.

The oxidation number of sulphur in S_8 , S_2,F_2, H_2 S respectively are

Answer»

0,+1 and -2
`+2, +1AND -2`
`0,+1 and +2`
`-2 ,+1 and-2`

SOLUTION :0,+1 and -2
Discussion
26377.

The oxidation number of sulphur in H_(2)S_(2)O_(8), H_(2)S_(2), O_(4), H_(2)S_(2)O_(6) are respectively

Answer»

`+3, +4, +5`
`+5, +4, +3`
`+6, +3, +5`
`+3, +5, +4`

Solution :`H_(2)S_(2)O_(8)` :
`{:("OO"),("||||"),(HO-S-O-O-S-OH""S(+VI)),("||||"),("OO"):}`
`{:("OO"),("||||"),(H_(2)S_(2)O_(4) : HO-S-S-OH""S(+III)):}`
`{:("OO"),("||||"),(H_(2)S_(2)O_(6) : HO-S-S-OH""S(+V)),("||||"),("OO"):}`
Discussion
26378.

The oxidation number of sulphur in H_2S_2O_8 is :

Answer»

`+2`
`+6`
`+7`
`+14`

Answer :B
Discussion
26379.

The oxidation number of sulphur atoms in peroxomonosulphuric acid (H_(2)SO_(5)) and peroxodi - sulphuric acid (H_(2)S_(2)O_(8)) are respectively

Answer»

`+8and+7`
`+3and+3`
`+6and+6`
`+4and+4`

ANSWER :C
Discussion
26380.

The oxidation number of S in S_(8) , S_(2)F_(2)andH_(2)S respectively are :

Answer»

`0,+1,-2`
`+2,+1,-2`
`0,+1,+2`
`+2,+1,-2`

ANSWER :A
Discussion
26381.

The oxidation number of sulphur in caro's acid is +x. What is value of x.

Answer»


SOLUTION :Marshall.s acid `=H_(2)S_(2)O_(8)`.
In structure is `HO-underset(O)underset(||)OVERSET(O)overset(||)S-O-O-underset(O)underset(||)overset(O)overset(||)S-O-H :. O` No. of `S=+6`
Discussion
26382.

The oxidation number of Pt is Zeise salt is :

Answer»

`+1`
`+2`
`+4`
`+6`

Answer :B
Discussion
26383.

The oxidation number of Pt in [Pt(C_2H_4)Cl_3]^(-) is:

Answer»

`+1`
`+2`
`+3`
`+4`

ANSWER :B
Discussion
26384.

The oxidation number of phosphorus in Mg_2P_2O_7 is:

Answer»

`+5`
`-5`
`+6`
`-7`

ANSWER :A
Discussion
26385.

The oxidation number of phosphorus in Ba(H_2PO_2)_2 is :

Answer»

`+3`
`+2`
`+1`
`-1`

ANSWER :C
Discussion
26386.

Calculate the oxidation number ofPb In Pb_3 O_4

Answer»

`+(4)/(3)`
`+4`
`+(8)/(3)`
`+2`.

Answer :C
Discussion
26387.

The oxidation number of P in KH_2PO_2 is:

Answer»

`+1`
`+3`
`-3`
`+5

Answer :A
Discussion
26388.

The oxidation number of oxygen in KO_(3), Na_(2)O_(2) is

Answer»

`3, 2`
`1,0`
`0, 1`
`-0.33, -1`

Solution :LET OXIDATION number of oxygen `=x`
O.N. of oxygen in `KO_(3)=1+3x=0`
`:. X=-1//3=-0.33`
O.N. of oxygen in `Na_(2)O_(2)=2xx1+2x=0"":. X=-1`.
Discussion
26389.

The oxidation number of oxygen in hydrogen peroxide is

Answer»

`+1`
`-1`
`+2`
`-2`

SOLUTION :`H_(2)O_(2):+1xx2+2x=0 THEREFORE x=-1`
Discussion
26390.

The oxidation number of O in H_(2)O_(2) is ?

Answer»

-2
-1
`+1`
`+2`

ANSWER :B
Discussion
26391.

The oxidation number of nitrogen in hydroxyl - amine is :

Answer»

`-1`
0
`-2`
`-3`.

ANSWER :D
Discussion
26392.

The oxidation number of nickel in K_(4)[Ni(CN)_(4)] is

Answer»

`-2`
`-1`
`+2`
`0`

Solution :`K_(4)[Ni(CN)_(4)]`
`4XX(+1)+x+4xx(-1)=0`
`+4+x-4=0 IMPLIES x=0`.
Discussion
26393.

The oxidation number of nitrogen in NH_(3) is :

Answer»

`-1`
`+3`
`-3`
`+1//3`

ANSWER :B
Discussion
26394.

The oxidation number of Ni in K_4[Ni(CN)_6]is:

Answer»

`+6`
`+4`
`+2`
`+3

Answer :C
Discussion
26395.

The oxidation number of 'Ni' in [Ni(CO)4] is _____

Answer»

0
2
4
1

Answer :A
Discussion
26396.

The oxidation number of N in NH_(4)Cl is

Answer»

`+5`
`+3`
`-5`
`-3`

Solution :`NH_(4)CL""NH_(4)^(+)+Cl^(-)`
`overset(**)(N)H_(4)^(+)`
`x+4=+1, x=1-=-3`.
Discussion
26397.

The oxidation number of N in NH_3 is:

Answer»

`-3`
`+3`
Zero
5

Answer :A
Discussion
26398.

The oxidation number of N in N_2H_5^+ is :

Answer»

`-2`
`+3`
`+2`
`-3`

ANSWER :A
Discussion
26399.

The oxidation number of N in N_(2)H_(5)^(+)

Answer»

`-3`
`(-2)`
`-1`
`+2`

Solution :`overset(**)(N)_(2)H_(5)^(+)`
`2x+5=+1, 2x=1-5`
`2x=-4, x=-2`.
Discussion
26400.

The oxidation number of Mn is +2 in

Answer»

manganese OXIDE
manganese chloride
manganese SULPHATE
POTASSIUM permanganate

Solution :`MnO toO`.noof `MN =+2`
`MnCI_2 toO .` ofMn =+2
`MnSO_4toO `. Noof `Mn =+2`
`KmnO_4toO` noof`Mn = +7`
Discussion