NEET Questions - Chemistry - Redox Reactions & Electrochemisty

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In which of the following reaction, $ H_2O_2 $ as reducing agent ?

$ HNO_2 + H_2O \rightarrow HNO_3 + H_2O $
$ 2KMnO_4 + 2H_2O_2 \rightarrow 2MnO_2 + 2KOH + 2H_2O + 3O_2 $
$ H_2SO_3 + H_2O_2 \rightarrow H_2SO_4 + H_2O $
$ 2Fe^{2+} + H^+ + H_2O_2 \rightarrow 2Fe^{3+} + H^+ + H_2O $

Which of the following is a redox reaction ?

$ As_2O_3 + 3H_2S \rightarrow As_2S_3 + 3H_2O $
$ 2NH_3 + H_2O + CO_2 \rightarrow (NH_4)2CO_3 $
$ CaO +3C \rightarrow CO + CaC_2 $
$ Be(OH)_2 + 2HCl \rightarrow BeCl_2 + 2H_2O $

Which of the following is a correct ascending order, when oxidation no. of sulphur of $ H_2SO_3, H_2S_2O_3, H_2S_2O_7, H_2S_2O_8 $ or sulphurus acid, thio sulphuric acid, oleum, dithianic acid is arranged in ascending order ?

$ H_2SO_3 \lt H_2S_2O_3 \lt H_2S_2O_7 \lt H_2S_2O_6 $
$ H_2SO_3 \lt H_2S_2O_3 \lt H_2S_2O_6 \lt H_2S_2O_7 $
$ H_2S_2O_3 \lt H_2SO_3 \lt H_2S_2O_7 \lt H_2S_2O_6 $
$ H_2S_2O_3 \lt H_2SO_3 \lt H_2S_2O_6 \lt H_2S_2O_7 $

When 0.25 mole $ I^– oxidised in IO_3 ^ – $ then what coulomb of electric charge relates with the reaction theoretically ?

$ 5.79 \times 10 ^ 5 C $
$ 4.82500 \times 10 ^5 C $
$ 2.895 \times 10 ^ 5 C $
$ 1.4475 \times 10 ^ 5 C $

In the sample of iron oxide, the no. of $ Fe^{2+} $ ion is 90% and no. of is 10% then what is the molecular formula ?

$ Fe_{0.905}O $
$ Fe_{0.952}O $
$ Fe_{0.825}O $
$ Fe_{0.857}O $

The oxidation no. of sulphur in $ Al_2(SO_4)_3 $ is

+8
+7
+5
+6

In a balanced equation, $ aP(S) + bH_2O + CO_2 \rightarrow dH_3PO_4 +CO_2 $ ,oxidation no. of oxygen decreases 30, then c -e= ______

3
1
2
4

In balanced equation, $ aCu_2S + bNO_3 ^- cH^+ \rightarrow 12Cu^{2+} + eSO_4 ^{2–} + fNO + gH_2O $ then what will be the change in oxidation no. and the value of b and g respectively ?

30, 10, 8
121, 20, 16
24, 10, 8
60, 20, 16

$ Mg |Mg ^ {2+} _{(c_1)} P Ag ^ + _{(c-2)} |Ag $ which of the following Nernst equation is correct for the given electrochemical cell ?

$ E ^\circ cell = E cell - { RT \over 2F } .ln { [Mg ^{2+}] \over [Ag^+]^2} $
$ E ^\circ cell = E cell - { RT \over F } .ln { [Mg ^{2+}] ^{1/2} \over [Ag^+]} $
$ E ^\circ cell = E cell - { RT \over 2F } .ln { [Mg ^{2+}] \over [Ag^+]} $
$ E ^\circ cell = E cell - { RT \over 2F } .ln { [Ag ^{+}] ^ 2 \over [Mg^{2+}]} $

What will be the oxidation potential of $ Pt | H_{2 _{(a)_ (1 bar)}} | H ^+ ( P ^H = 11) half cell 25 ^\circ C $ temperature ?

0.177v
0.649v
0.282v
0.616v

For an electrochemical cell, $ Mg| Mg^{2+}_{(C1)} || Br^-_{(C2)} | Br_{2(1)} | Pt $ , what wiil be the change in cell potential, when conc of solution of cathode increase at constant temperature ?

increases
decreases
No change occurs
$ E cell=E ^\circ cell $

Aqueous solution of salt of metal B is stored in a vessel of metal A and aqueous solution of solt of metal c can be stored in the vessel of metal B, then, which of the following is the correct descending order of their strength of reducing agent of A, B and c ?

$ A \gt B \gt C $
$ A \gt C \gt B $
$ C \gt B \gt A $
$ C \gt A \gt B $

Standard oxidation potential of half cells of $ A/A^{2+}, B/B^{2+}, C/C^{2+} and D/D^{2+} $ are in increasing order, then which of the following statement is correct ?

solution of salt of $A^{2+}$ can be stored in the vessel of metal B.
solution of salt of $D^{2+}$ can’t be stored in the vessel of metal C.
solution of salt of $D^{2+}$ can be stored in the vessel of metal B.
given all three statements are wrong.

For which of the following compound, a graph of mular conductivity and $(molarity)^{1/2} $ is obtained straight line ?

CsCl
$ NH_4 OH $
HCOOH
given all three

5 faraday electric charge is passed during electrolysis of molten $cacl_2$ solution, then what moles of Ca obtained at cathode experimentally ?

2.5 mole
less than 2.5 mole
more than 2.5 mole
5 mole

NEET Chemistry Questions: Redox Reactions & Electrochemisty