Electrochemistry

When CuSO₄ is electrolyzed in aqueous solution using copper electrodes, then the substance which deposits at the cathode is:

The most durable metal plating on iron to protect against corrosion is:

In nickel-cadmium battery, the cathode is composed of:

The emf produced by Galvanic Cell is known as:

In an electrochemical series, standard electrode potentials are arranged on the basis of:

Study the following facts:

Zn → Zn⁺² + 2e^- E_o = +0.76 V

Cu → Cu⁺² + 2e^- E_o = – 0.34 V

The E₀ value of the standard copper half cell is 0.34, measured when it is connected withthe SHE i.e. Standard H_ydrogen Electrode. In this case the half cell reaction taking place atSHE is:

During space flights, astronauts obtain water from _:

Which of the following is the most environmentally-friendly source to derive energy?

Aqueous solutions of Iodine and Sodium hydroxide were mixed in a round bottom flask at 70 C. Following chemical reaction was carried out. 3I₂ + 6 NaOH → NaIO₃ + NaI + H₂O.This reaction is termed as:

An electrochemical cell is based upon which reaction?

Which step is irrelevant concerning the balancing of redox equations by the oxidation number method?

Which of the following best identifies the redox reaction?

Which of the following situations most clearly demonstrates a key characteristic of a Redox reaction?

Pick the order of ease of reduction of H⁺¹,Cu⁺² and Ag⁺¹:

760 torr are equal to Pascal:

Placing a rod of iron metal in a solution of CuSO₄:

What change in oxidation number of Cu takes place in the following reaction? Cu + 4HNO₃ → Cu(NO₃)₂ + 2NO₂ + 2H₂O

Oxidation number of "Mn" in KMnO₄ is:

The oxidation number of oxygen in Na₂O₂ is:

In the reaction Cr₂O₇³⁻ + 14H⁺ → 2Cr³⁺ + 7H₂O, how many electrons are gained or lost by chromium atom?

Oxidation number of 'Mn' in KMnO₄ is:

When aqueous solution of NaCl is electrolyzed:

In redox reaction of SO₂ with KMnO₄ in acidic medium:

What is the oxidation number of Cl₂?

The electrolysis of dilute acid solution gives:

In which of the following does oxygen show a fractional oxidation number?

Which of the following is a feasible reaction?

The oxidation state of "S" in (S₂O₃)²⁻ is:

Keeping in view the standard reduction potentials: Mg²⁺/Mg = -2.37V,

Zn²⁺/Zn = -0.76V,

2H⁺/H2 = 0.000V,

Cu²⁺/Cu = +0.34V;

which one of the following is a feasible redox reaction?

Aqueous solutions of Iodine and Sodium hydroxide were mixed at 70°C: 3I₂ + 6NaOH → NaIO₃ + NaI + H₂O. This reaction is termed as:

The oxidation state of nitrogen in NH₄NO₃ are:

Which of the following is a spontaneous reaction?

Choose the true statement regarding the reaction: 2NaCl_(s) → 2Na + Cl₂

In which of the following reactions does hydrogen act as oxidizing agent?

Rusting of iron metal Fe occurs when Fe gets converted into Fe₂O_3. What happens with Fe?

In a galvanic cell with hydrogen and copper electrodes, the current will flow from:

Keeping in mind the electrode potential, which one of the following reactions is feasible?

The E° value of standard copper half-cell is +0.34V, measured when it is connected with SHE. In this case the half reaction taking place at SHE is:

In an electrochemical series, elements are arranged on the basis of:

The value of oxidation number of chlorine in HClO₃ is:

The oxidation state of carbon in C₂O₄²⁻ is:

In NO^3⁻, the oxidation number of "N" is:

Study the following redox reaction: 10Cl⁻ + 16H⁺ + 2MnO₄⁻ → 2Mn²⁺ + 8H₂O. Which statement is true about this reaction?

In SO₃, the oxidation number of sulphur is:

Which one of the following behaves as a redox reaction?

In MgCl₂, the oxidation state of Cl is:

In Al / Al³⁺ || Zn²⁺ / Zn galvanic cell, the anode is:

The oxidation reaction that takes place in the SHE is:

The product produced at the cathode when aqueous sodium chloride is electrolyzed:

The cathodic reaction in the electrolysis of dil. H₂SO₄ with Pt electrodes is:

During electrolysis of aqueous KNO₃, H₂ is produced at cathode instead of potassium due to:

The electrolysis product of molten NaCl at electrodes:

In which of the following changes is there a transfer of two electrons?

Which of the following reactions occurs at cathode?

5H⁺ + MnO₄⁻ → Mn²⁺ + 4H₂O. Which one is correct about the given equation?

In the reaction H₂S + Cl₂ → 2HCl + S, H₂S acts as:

In which of the following reactions is there a transfer of five electrons to Cr³⁺?

In redox reaction: MnO₂ + 4H⁺ → Mn²⁺ + 2H₂O, which statement is correct?

The element on the reactant side which has been reduced in: I₂ + H₂SO₄ → HI + SO₂ + H₂O is:

The oxidation number of oxygen atom in OF₂ and H₂O₂ respectively:

What is the oxidation state of "O" in KO₂?

Which of the following substance does sulphur exhibit its highest oxidation state?

In lead accumulator, cathode is made up of:

In the electrolysis of NaOH_(aq), which product is obtained at anode?

On balancing of equation K₂Cr₂O₇ + HCl, the coefficient with HCl will be?

In NICAD battery cathode is:

The oxidation number of oxygen in OF₂ is:

Oxidation state of "S" in H₂SO₄ is:

Which of the following is used for galvanizing iron sheet?

Oxidation number of a substance in elemental form is:

In acidic medium, oxidation action of potassium permanganate depends upon:

When zinc electrode is coupled with copper electrode in a galvanic cell:

The oxidation states of Nitrogen in NH₄NO₃ are:

Which one of the following is the correct oxidation state of Mn in KMnO₄?

Students calculated the cell voltage for the reaction, 𝐵𝑟₂ + 2𝑁𝑎𝐶𝑙 ⟶ 2𝑁𝑎𝐵𝑟 + 𝐶𝑙₂ through the formula 𝐸°𝑐𝑒𝑙𝑙= 𝐸°𝑟𝑒𝑑+ 𝐸°𝑜𝑥𝑑 the answer was negative. It means that:

The reducing agent in the reaction given, 𝐾𝑀𝑛𝑂₄ + 𝐾𝐼 + 𝐻₂𝑆𝑂₄ ⟶ 𝑀𝑛𝑆𝑂₄ + 𝐾₂𝑆𝑂₄ +𝐼₂ + 𝐻₂𝑂 is:

For the purification, impure copper is made the:

Study the following redox reaction and answer the following question: 10Clˉ +16H⁺ + 2MnO₄ˉ → 5Cl₂ + 2Mn²⁺ + 8H₂O

The diagram shows a galvanic cell. The current will flow from:

Which one pair has the same oxidation state of 'Fe'?

Which one of the following is a redox reaction?

In the figure given below, the electron flow in external circuit is from:

In all oxidation reactions, atoms of an element in a chemical species lose electrons and increase their:

In electrolytic cell, a salt bridge is used in order to:

In MgCl₂, the oxidation state of 'Cl' is :

In electrolysis of aqueous CuCl₂, the metal deposited at the cathode is:

Study the following facts: Zn → Zn⁺² + 2e^- Eo = +0.76 V

Cu → Cu⁺² + 2e^- Eo = - 0.34 V

By accepting an electron, a Hydronium ion is converted into:

In metal hydrides the oxidation number of hydrogen is:

In a galvanic cell, the Zinc Sulphate in the left beaker acquires?

In an electrochemical cell, negative ions are migrated towards:

The platinum in standard hydorgen electrode acts as a:

In Ion electron method, while balancing oxygen and Hydrogen atoms _.

In balancing it is very important to identify the substance whose:

Representing reaction in Voltaic cell symbol used for salt bridge is _.

Electrolysis is a _.

When a molten salt is electrolyzed the products are _.

Downs Cell is used for the electrolysis of _.

In 'Down Cell', anode is made up of -------

Electrons in a Voltaic Cell flow from ---------- to -----------

Two compartments of a galvanic cell are connected by ----------

Fused Bauxite is electrolyzed to get:

Order of discharge of ions depends upon :

Sum of oxidation numbers of all the molecules in a neutral atom is

Down's Cell is used for the electrolysis of:

In Electrochemical Cell Positive Ions are migrated towards?

Arrangement of metals on the basis of their electrode potentials on standard hydrogen scale is called _.

In industry, caustic soda is formed by electrolysis of _.

A voltaic cell produces electrical energy from _.

What is the emf of Zn-Cu cell ?

The electrolysis of aqueous solutions of salt is complex because of the ability of water _.

In the oxidation number method of balancing, the first step is to write.

In Balancing the redox equation, the first thing is to:

For balancing oxygen and hydrogen atoms in acids or neutral solutions?

Standard electrode Potential is denoted by?

In Down Cell anode is made up of?

In a voltaic cell, two half cells actually separate?

Standard Electrode potential is measured at?

In "Down Cells", the cathode is made up of:

Hydroxide Ions are combined to give _.

In a galvanic cell of Zinc Sulphate, the beaker with ZnSO₄ acquires a _.

Oxidation Number can be?

Downs Cell is used for the electrolysis of?

In Electrolysis of aq NaNO₃, Na⁺ is:

Salt Bridge contains ?

In Electrochemical Cells Reduction takes place at?

The number of electrons added on both sides of the oxidation and reduction half-reactions are balanced _.

A Salt Bridge is used for the purpose of _.

Electrolysis is a ?

Voltaic cell can be converted into a reverse galvanic cell by?

A voltaic cell produces electrical energy from?

By accepting an electron, the hydronium ion is converted into?

Salt bridge are used to give?

In Electrochemical Cell Positive Ions are migrated towards:

Electrolysis of bauxite is done by ?

Fused Bauxite is electrolyzed to get _?

For a Voltaic Cell containing Zn and Copper electrodes, the cell potential at standard conditions is?

Electrolysis is carried out in _?

Electrolyte can be in _?

In a Voltaic Cell, a Zinc Electrode is dipped in?

In a galvanic cell Copper compartment gets a net negative charge due to the arrival of _.

In Ion Electron Method of Balancing, equations are _.

Changing the material of an electrode affects:

Metals with a high positive value of standard electrode potentials:

Electrons flow from:

What is the physical significance of the oxidation state?

In an electrolytic cell, a salt bridge is used in order to:

What is the oxidation number of Cr in K₂CrO₄?

Which solution is present in salt bridge?

Which one of the following is true about this reaction? 3Fe + 3Cl₂ → 2FeCl₃

EMF series helps in the determination of:

The value of SHE is taken as:

An element that has a large negative value of standard reduction potential can:

Which one of the following is true about the reaction; Zn + Cu²⁺ → Zn²⁺ + Cu?

The standard electrode potential of hydrogen is measured by:

What does the symbol, || , mean?

What does a negative cell voltage value for a reaction means?

What is the basic principle of balancing the equation by Oxidation number?

The reaction between the H₂ and O₂ can be increased by adding_.

The electrochemical series will predict the:

Weak electrolytes ionize slowly, so their solubility as compared to strong electrolytes is:

Which of the following has the highest reduction potential?

In which of the following compounds does an element have a +2 oxidation state?

Which of the following reactions is divided into two parts?

The electrode through which electrons enter the electrolytic solution is:

In an electrolytic cell hydroxide ions are combined to give _.

The reaction in Galvanic Cell is:

When we react an active metal like Al with less active element like Cu, it will form?

Two compartments of a galvanic cell are connected by:

The platinum in SHE act as a:

Each half-reaction in the ion-electron method is balanced by adding:

Caustic Soda is made by electrolysis of a concentrated solution of NaCl in:

The electrolysis of acetate solution produces ethane according to the reaction:2CH₃COO^- C₂H_6(g) + 2CO_2(g) + 2e^-The current efficiency of the process is 80%. What volume of gases would be produced at 27^oC and 740 torr, if the current of 0.5 amp is passed through the solution of 96.45 min?

In electrochemical series, reduction potential relates to only:

In balancing, it is very important to identify the substance whose:

Salt Bridge is used for the purpose of:

The standard electrode potential of hydrogen is arbitrarily taken at 298 K is _

Redox reactions actually transfer

Standard electrode potential is represented as follows:

The unit of electronegativity is?

Electrode Potential is developed when a metal is dipped into:

Keeping in view the values of standard reduction potential given above, which one of the following would you select as a feasible redox chemical reaction?

Oxidation number of particular element can be directly or indirectly inferred from its:

Which of the methods to prevent corrosion?

The Oxidation state of Alkali metals in any compound is?

The hydrogen gas bubbling into one molar solution of HCl has a pressure of

In Balancing redox equation, the first thing is to:

Hydrolysis means reaction with

Decrease in Oxidation number is

Only those substances are written in Ion Electron Method:

Each half reaction in ion electron method is balanced by adding:

Conversion of Electrical energy into chemical energy is

The E.M.F of a Cell is equals to

The oxidation potential standard hydrogen electrode is arbitrarily taken as:

The oxidation number of Br in Br₂ is:

In the electrolysis of molten ZnCl₂, how much Zn can be deposited at the cathode by the passage of 0.01 ampere for one hour?

A solution of Sodium Sulphate was electrolyzed using a platinum electrode, the products at the anode and cathode respectively are:

Which of the following statements about the reaction given below are correct? IO₃^-_(aq) + 2I^-_(aq) + 6H⁺_(aq) + 6Cl^-_(aq) 3ICl₂^-_(aq) + 3H₂O_(l)

Which one among the following is the strongest reducing agent:Fe²⁺ + 2e Fe (-0.44V)

Sn²⁺ + 2e Sn (-0.14 V)

Ni²⁺ + 2e Ni (0.25 V)

Fe³⁺ + e Fe²⁺ (0.77 V)

X is a salt that decomposes in water. What is the reason for its decomposition? e^- + X³ → X²+ Ecell = 1.91 V

The oxidation number of nitrogen in the HNO₃ is _.

What is the cell reaction of Zn_(s) | Zn²⁺_(aq) 1M | Ni²⁺_(aq) 1M | Ni_(s)

Zn²⁺_(aq) + 2e^-Zn_(s), Eo = -0.76 V

Ni²⁺_(aq) + 2e^- Ni_(s), Eo = -0.25 V

Which of the following metals does NOT liberate hydrogen in reaction with acids?

The electrolyte used in fuel cell is:

The oxidation state of carbon in C₂O₄^2- is:

Which of the following is a balanced redox equation?

The breakdown of a substance with current is:

The overall positive reduction potential value predicts that the process is:

If we move down the electrochemical series:

The process in which electric current is used to carry out a non-spontaneous redox reaction is called:

In the reaction 2Fe+Cl₂ 2FeCl₃

CH₃Cl + Cl₂ CH₂Cl₂ + HCl is an example of?

During oxidation process, oxidation number of an element:

The common oxidation number of halogens is:

The oxidation state of "S' in the (S₂O₃)^-2 is:

In electrochemical series, elements are arranged in order of their standard electrode potentials, the correct decreasing reactivity order for metals is:

When electricity is passed through water in the presence of an acid, oxygen and _ are produced.

If we balanced the following reaction, what is the net ionic charge on the right side of the equation? H⁺ + MnO₄^- + Fe²⁺ →Mn²⁺ + Fe³⁺ + H₂O

In the following reaction: 3Br₂ +6CO₃^2- + 3H₂O → 5Br^-1 + BrO₃^-1 + 6HCO₃^-1

The reaction: Cl₂ + H₂O → HCl + HOCl is an example of:

The oxidation number of all the elements in the free state is:

The oxidation number of Nitrogen in HNO₃ is:

In which of the following nitrogen compounds, does N has the highest oxidation state?

The potential difference of an electrochemical cell is measured by:

The process of depositing a thin layer of expensive metals on ordinary or expensive metals is called:

When fused PbBr₂ is electrolyzed:

Stronger the oxidizing agent, higher is the:

In the disproportion reaction: H₃PO₂ → PH₃ + H₃PO_3 The equivalent mass of H₃PO₂ is (m = molecular mass of H₃PO₂):