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What is the value of $ \triangle H for the reaction 4H_{2(g)} + 2 O_{2(g)}\rightleftharpoons 4 H_2 O _{(l)} \triangle H taking place in H_2 fuelcell $ ?
Which catalyst are used in fuel cell at anode and cathode respectively?
What changes takes place in the $E ^\circ _{cell} $ , of electrochemical cell if cell reactions are taking place at electrodes are multiplied by n?
The standard cell potential (E°cell) is independent of the stoichiometric coefficients of the cell reactions. Multiplying the cell reactions by a factor n does not change the E°cell value. Therefore, the correct option is o1: no changes.
Group-l cell and in group 2 potentials are given then match the correct options group-1 (i) Laclanche cell (ii) Lead storage cell (iii) Mercury cell (iv) Fuel cell group-2 (A) 1.23 V (B) 2.35 V (C.)1.53 V (D) 2.0 V (.E) 1.32 V (F) 1.35 V (G) 1.75 V (H) 1.5 V
According to authentic symbol system $ { l \over AR } $
According to the authentic symbol system, the symbol ${1 \over \rho}$ represents the reciprocal of density (Ï). This is a common representation used in scientific literature and equations involving density.
Which subsance is present as electrolyte in mercury cell?
Select correct option for the given statements (where T true and F— false ) (i) by conductance of electricity tcnvcrature of metal increases and no changes are observed in the solution of electrolyte (ii) by conductance of electricity metal experience chemical reaction and changes are observed in the solution of electrolyte. (iii) by conductance Of electricity no changes are observed in metal and solution Of electrolyte (iv) by conductance of temperature of metal increases and changes are observed in the solution of electrolyte
Dissociation constant of one weak electrolyte is $ 1.77 \times 10^{-5} . If it’s A^\circ_m 390.5 S.cm^2.mol^{-1} then what is the molar conductance of its 0.01M aqueous solution?
Which metals are used as sacrifical anode to stop the corrosion of the iron in steamer'?
Zinc (Zn) and magnesium (Mg) are used as sacrificial anodes to prevent the corrosion of iron in steamers. These metals are more reactive than iron and undergo oxidation, protecting the iron from corrosion.
In group - I , 2 and 3 electrolytc and products at anode and cathode arc mentioned respectively match them appropriately.
Group -1
(1) NaCl (molten)
(2) NaCl (conc. aqueous) (
3) NaCl (dilute aqeous)
(4) $ Al_20_3 , ( +Na_3AIF_6) $
(5) $ KIIF_2 anhydrous HF $
Group -2
(A) $ O_{2(g)} $
(B) $ O_{2(g)} , CO_{(2(g)} $
(C) $ Cl_{2(g)} $
(D) $ F_{2(g)} $
(E) $ H_{2(g)} $
Group-3
(P) Al metal
(Q) $ Cl_{2(g)} $
(R) Na metal
(S) $ H_{2(g)} and in solution NaOH$
(T ) $ H_{2(g)} $
The correct match is: (1) - (C) - (R), (2) - (C) - (S), (3) - (A) - (T), (4) - (B) - (P), (5) - (D) - (T). This matches the electrolytes (molten/aqueous NaCl, Al2O3, KHF2) with the respective products formed at the anode and cathode during electrolysis.
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