What are half reactions for a galvanic cell with Zn and Ni electrons?

What are half reactions for a galvanic cell with Zn and Ni electrons?
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What are the half-reactions for galvanic cell with Ni and Mg electrodes?

Description : What are the half-reactions for galvanic cell with Ni and Mg electrodes?

Last Answer : Ni2+(aq) + 2e- Ni(s) and Mg(s) Mg2+(aq) + 2e-

(a) What are fuel cells? Explain the electrode reactions involved in the working of H2 – O2 fuel cell. (b) Represent the galvanic cell in which the reaction Zn (s) + Cu2+ (aq) → Zn2+ (aq) + Cu (s) takes place. -Chemistry

Description : (a) What are fuel cells? Explain the electrode reactions involved in the working of H2 – O2 fuel cell. (b) Represent the galvanic cell in which the reaction Zn (s) + Cu2+ (aq) → Zn2+ (aq) + Cu (s) takes place. -Chemistry

Last Answer : (a) Fuel cells : These cells are the devices which convert the energy produced during combustion of fuels like H2, CH4, etc. directly into electrical energy. The electrode reaction for H2 – O2 fuel cell : (b) The galvanic cell may be represented as Zn (s) | Zn2+ (1M) || Cu2+ (1M) | Cu (s)

Assertion :- `Zn(s)+Cu^(+2)(aq)rarr Zn^(+2)(aq)+Cu(s)` can be spilt into following half reactions `{:(Zn(s)rarrZn^(+2)+2e^(-),),(,"(Oxidation half rea

Description : Assertion :- `Zn(s)+Cu^(+2)(aq)rarr Zn^(+2)(aq)+Cu(s)` can be spilt into following half reactions `{:(Zn(s)rarrZn^(+2)+2e^(-),),(,"(Oxidation half rea

Last Answer : Assertion :- `Zn(s)+Cu^(+2)(aq)rarr Zn^(+2)(aq)+Cu(s)` can be spilt into following half ... Reason is False. D. If both Assertion & Reason are False.

Why do electrons transfer from zinc rods to copper rods in galvanic cells ?

Description : Why do electrons transfer from zinc rods to copper rods in galvanic cells ?

Last Answer : Zinc rods and zinc sulphate solutions are used at the anode of galvanic cells and copper rods and copper sulphate solutions are used at the cathode. Zinc acts as an antidote and copper as an oxidizer, ... . Thus , electrons are transferred from the zinc bar to the copper bar in the mentioned cell.

The correct order of spin-only magnetic moments among the following is : (Atomic number : Mn=25,Co=27,Ni=28,Zn=30)

Description : The correct order of spin-only magnetic moments among the following is : (Atomic number : Mn=25,Co=27,Ni=28,Zn=30)

Last Answer : The correct order of spin-only magnetic moments among the following is : (Atomic number : Mn=25,Co=27,Ni=28,Zn=30) ... (4)]^(2-) gt [ZnCl_(4)]^(2-)`

The geometries of the ammonia complexes of `Ni^(2+),Pt^(2+) and Zn^(2+)`, respectively, are

Description : The geometries of the ammonia complexes of `Ni^(2+),Pt^(2+) and Zn^(2+)`, respectively, are

Last Answer : The geometries of the ammonia complexes of `Ni^(2+),Pt^(2+) and Zn^(2+)`, ... planar and octahedral D. octahedral , tetrahedral and square planar

German Silver is an alloy of------? A. Zn + Ni B. Cu + Zn C. Cu + Ni (Answer) D. Cu + Sn E. None of these

Description : German Silver is an alloy of------? A. Zn + Ni B. Cu + Zn C. Cu + Ni (Answer) D. Cu + Sn E. None of these

Last Answer : C. Cu + Ni (Answer)

Which of the following reagents can be used to distinguish between chlorobenzene and allyl chloride? (a) H2/Ni(b) Br2 in CCl4(c) Zn/HCl(d) NH2NH2

Description : Which of the following reagents can be used to distinguish between chlorobenzene and allyl chloride? (a) H2/Ni (b) Br2 in CCl4 (c) Zn/HCl (d) NH2NH2

Last Answer : Br2 in CCl4

Cyclohexanol can be converted into cyclohexene by heating with (a) Zn(Hg) and HCl(b) Concentrated H2SO4(c) SOCl2(d) H2 and Ni

Description : Cyclohexanol can be converted into cyclohexene by heating with (a) Zn(Hg) and HCl (b) Concentrated H2SO4 (c) SOCl2 (d) H2 and Ni

Last Answer : Concentrated H2SO4

Starting with 2-butene, which of the following is the best method for preparing 2-butyne? (a) HBr; H2/Ni; Zn/H+ (b) HBr; Zn/H+; H2/Ni (c) Br2/CCl4; Zn/H+; H2/Ni (d) Br2/CCl4; 2NaNH2

Description : Starting with 2-butene, which of the following is the best method for preparing 2-butyne? (a) HBr; H2/Ni; Zn/H+ (b) HBr; Zn/H+; H2/Ni (c) Br2/CCl4; Zn/H+; H2/Ni (d) Br2/CCl4; 2NaNH2

Last Answer : Br2/CCl4; 2NaNH2

The trace metal present in insulin is (A) Cu (B) Zn (C) Fe (D) Ni

Description : The trace metal present in insulin is (A) Cu (B) Zn (C) Fe (D) Ni

Last Answer : (B) Zn

Name the metal M which is extracted on the basis of following reactions: `4M+8NaCN+2H_(2)O+O_(2)to` `4NaM(CN)_(2)+4NaOH` `2NaM(CN)_(2)+ZntoNa_(2)Zn(CN

Description : Name the metal M which is extracted on the basis of following reactions: `4M+8NaCN+2H_(2)O+O_(2)to` `4NaM(CN)_(2)+4NaOH` `2NaM(CN)_(2)+ZntoNa_(2)Zn(CN

Last Answer : Name the metal M which is extracted on the basis of following reactions: `4M+8NaCN+2H_(2)O+O_(2)to` `4NaM(CN)_(2 ... 2M` A. Au or Ag B. Hg C. Ni D. Fe

What of the following reactions demonstrates a synthesis reaction A) Mg plus H2SO4 and gt MgSO4 plus H2 B) 2NaCl and gt 2Na plus Cl2 C) C plus O2 and gt CO2 D) Zn plus 2HCl and gt ZnCl2 plus H2?

Description : What of the following reactions demonstrates a synthesis reaction A) Mg plus H2SO4 and gt MgSO4 plus H2 B) 2NaCl and gt 2Na plus Cl2 C) C plus O2 and gt CO2 D) Zn plus 2HCl and gt ZnCl2 plus H2?

Last Answer : C+O2 →CO2

What is Galvanic Cell or Valtic Cell ?

Description : What is Galvanic Cell or Valtic Cell ?

Last Answer : : Galvanic or voltaic cells are those cells where electrical energy is produced by chemical reactions of substances inside the cell. In galvanic cells, usually two electrodes made up of two different ... between the two electrolytic solutions . A U -shaped glass contains a solution of KCl salt.

What is Galvanic Cell ? What is a galvanic cell ?

Description : What is Galvanic Cell ? What is a galvanic cell ?

Last Answer : A galvanic cell is an electrochemical cell in which a chemical reaction occurs spontaneously , that is , no external force is required for the reaction to take place .

What reaction occurs at the cathode of a galvanic cell?

Description : What reaction occurs at the cathode of a galvanic cell?

Last Answer : Feel Free to Answer

What is the voltage of a galvanic cell made with silver a d aluminum?

Description : What is the voltage of a galvanic cell made with silver a d aluminum?

Last Answer : Feel Free to Answer

What is oxidized in galvanic cell made with silver and nickel electrodes?

Description : What is oxidized in galvanic cell made with silver and nickel electrodes?

Last Answer : The nickel metal(apex)

What is the standard notation of a galvanic cell made with magnesium and gold?

Description : What is the standard notation of a galvanic cell made with magnesium and gold?

Last Answer : Mg(s) | Mg2+(aq) Au+(aq) | Au(s)

What is Galvanic cell ?

Description : What is Galvanic cell ?

Last Answer : A Galvanic cell or voltaic cell or electrochemical cell is a system in which a spontaneous chemical oxidation- reduction occurs and generates electrical energy.

The device used to convert solar energy into electricity is – (1) Photovoltaic cell (2) Daniell cell (3) Electrochemical cell (4) Galvanic cell

Description : The device used to convert solar energy into electricity is – (1) Photovoltaic cell (2) Daniell cell (3) Electrochemical cell (4) Galvanic cell

Last Answer : (1) Photovoltaic cell Explanation: Sunlight is converted into electricity using photovoltaics (PV). A photovoltaic system employs solar panels composed of a number of solar cells to supply usable solar power.

What is meant by Electrochemical cell . Why is it called as galvanic cell and Voltaic cell ?

Description : What is meant by Electrochemical cell . Why is it called as galvanic cell and Voltaic cell ?

Last Answer : Ans. :- The cell which converts chemical energy into electrical energy . It is called as galvanic cell and Voltaic cell after the name of scientists who first tried to convert chemical energy into electrical energy .

Define the following : Electrochemistry , Electrolyte , Non-Electrolyte , Electrolytic Cell , Galvanic or Voltaic cell , Electrolysis , Hydrolysis & electroplating.

Description : Define the following : Electrochemistry , Electrolyte , Non-Electrolyte , Electrolytic Cell , Galvanic or Voltaic cell , Electrolysis , Hydrolysis & electroplating.

Last Answer : Ans : (a) Electrochemistry : Electrochemistry is the branch of chemistry which deals with such chemical reactions involving the inter-conversion of electrical energy and chemical energy. Example : Batteries , ... should be a solution of the coating metal, such as its metal nitrate or sulfate.

___________ converts electrical energy into chemical energy. a) Galvanic cell b) Voltaic cell c) Electrolytic cell d) Leclanche cell

Description : ___________ converts electrical energy into chemical energy. a) Galvanic cell b) Voltaic cell c) Electrolytic cell d) Leclanche cell

Last Answer : c) Electrolytic cell

The device used to convert solar energy into electricity is (1) Photovoltaic cell (2) Daniell cell (3) Electrochemical cell (4) Galvanic cell

Description : The device used to convert solar energy into electricity is (1) Photovoltaic cell (2) Daniell cell (3) Electrochemical cell (4) Galvanic cell

Last Answer : Photovoltaic cell

Consider the following reactions `underset(2)(Xe)+underset(1)(F_2)overset(Ni)to A` `underset(1)(Xe)+underset(20)(F_2)to B` `underset(1)(Xe)+underset(5

Description : Consider the following reactions `underset(2)(Xe)+underset(1)(F_2)overset(Ni)to A` `underset(1)(Xe)+underset(20)(F_2)to B` `underset(1)(Xe)+underset(5

Last Answer : Consider the following reactions `underset(2)(Xe)+underset(1)(F_2)overset(Ni)to A` `underset(1)(Xe)+underset(20 ... B D. A,B, C are act as lewis base.

(3) made cathode and a pure nickel red, the anode Explanation: Electroplating is the deposition by electrolysis of a coating of metal upon a conducting surface. The simplest system makes the object to be plated the negative electrode (cathode) or plate in a galvanic couple. Thus a spoon or other object may be connected by a wire to a plate of nickel. The process that occurs on the spoon is called reduction and, therefore, the spoon is also referred to as a cathode.

Description : (3) made cathode and a pure nickel red, the anode Explanation: Electroplating is the deposition by electrolysis of a coating of metal upon a conducting surface. The simplest system makes the object to be ... on the spoon is called reduction and, therefore, the spoon is also referred to as a cathode.

Last Answer : Which of the following is not a method of preparing oxygen? (1) Electrolysis of water (2) Fractional distillation of liquid air (3) Decomposition of potassium permanganate (4) Decomposition of manganese dioxide

Galvanic corrosion cannot be prevented by (A) Cathodic protection (B) Anodic protection (C) Usage of largest possible anodic area (D) Any one of these

Description : Galvanic corrosion cannot be prevented by (A) Cathodic protection (B) Anodic protection (C) Usage of largest possible anodic area (D) Any one of these

Last Answer : Option B

Two half-reactions of an electrochemical cell are given below : MnO–4 (aq) + 8H+ (aq) + 5e– → Mn2+ (aq) + 4H2O (I), E° = 1.51 V Sn2+ (aq) → Sn4+ (aq) + 2e–, E° = + 0.15 V. Construct the redox equation from the standard potential of the cell and predict if the reaction is reactant favoured or product favoured. -Chemistry

Description : Two half-reactions of an electrochemical cell are given below : MnO-4 (aq) + 8H+ (aq) + 5e- → Mn2+ (aq) + 4H2O (I), E° = 1.51 V Sn2+ (aq) → Sn4+ (aq) + 2e- ... the redox equation from the standard potential of the cell and predict if the reaction is reactant favoured or product favoured. -Chemistry

Last Answer : The reactions can be represented at anode and at cathode in the following ways : At anode (oxidation) : Sn2+ → = Sn4+ (aq) + 2e- ] 5 E° = + 0.15 V At cathode (reduction) : MnO-4(aq) + 8H+ ... = E°cathode - E°anode = 1.51 - 0.15 = + 1.36 V ∴ Positive value of E°cell favours formation of product.

Two half-reactions of an electrochemical cell are given below : MnO–4 (aq) + 8H+ (aq) + 5e– → Mn2+ (aq) + 4H2O (I), E° = 1.51 V Sn2+ (aq) → Sn4+ (aq) + 2e–, E° = + 0.15 V. Construct the redox reaction equation from the two half-reactions and calculate the cell potential from the standard potentials and predict if the reaction is reactant or product favoured. -Chemistry

Description : Two half-reactions of an electrochemical cell are given below : MnO-4 (aq) + 8H+ (aq) + 5e- → Mn2+ (aq) + 4H2O (I), E° = 1.51 V Sn2+ (aq) → Sn4+ (aq) + ... -reactions and calculate the cell potential from the standard potentials and predict if the reaction is reactant or product favoured. -Chemistry

Last Answer : The reactions can be represented at anode and at cathode in the following ways : At anode (oxidation) : Sn2+ → Sn4+ (aq) + 2e- ] 5 E° = + 0.15 V Af cathode (reduction) : MnO-4(aq) + 8H+ ( ... = E°cathode - E°anode = 1.51 - 0.15 = + 1.36 V ∴ Positive value of E°cell favours formation of product.

Which one of the following statements is not correct? A Since voltage depends on concentrations, using standard conditions makes it easier to compare different electrochemical reactions. B We have to measure the cell potential to obtain the difference in potential energy because the potential of half-reactions cannot be measured directly. C The direction of a redox reaction can only be determined experimentally. D Half-cell potentials for half-reactions are determined by combining the relevant half-cell with a standardised half-cell.

Description : Which one of the following statements is not correct? A Since voltage depends on concentrations, using standard conditions makes it easier to compare different electrochemical reactions. B We have ... half-reactions are determined by combining the relevant half-cell with a standardised half-cell.

Last Answer : C The direction of a redox reaction can only be determined experimentally. 

Which of the following is an electrolytic cell A. lron * (ll) * (Fe) oxidized, aluminum (Al) reduced O B. Silver (Ag) oxidized, gold (Au) reduced C. Aluminum () oxidized (Zn) reduced LithiumD. (Li) oxidized, (Zn) reduced?

Description : Which of the following is an electrolytic cell A. lron * (ll) * (Fe) oxidized, aluminum (Al) reduced O B. Silver (Ag) oxidized, gold (Au) reduced C. Aluminum () oxidized (Zn) reduced LithiumD. (Li) oxidized, (Zn) reduced?

Last Answer : The answer is not c.

The emf of a Deniell cell “Zn | Zn2+|| Cu2+| Cu” can be increased by (A) Decreasing the surface area of the electrodes (B) Increasing the concentration of zinc sulphate solution (C) Increasing the surface area of the electrodes (D) Increasing the concentration of copper sulphate solution

Description : The emf of a Deniell cell “Zn | Zn2+|| Cu2+| Cu” can be increased by (A) Decreasing the surface area of the electrodes (B) Increasing the concentration of zinc sulphate solution (C) Increasing the surface area of the electrodes (D) Increasing the concentration of copper sulphate solution

Last Answer : (D) Increasing the concentration of copper sulphate solution

Where do electrons get their energy in light reactions?

Description : Where do electrons get their energy in light reactions?

Last Answer : .From photons in solar energy

Where do electrons get their energy light reactions?

Description : Where do electrons get their energy light reactions?

Last Answer : From photons in solar energy - apex

The relative tendency of the atoms to at- tract electrons in chemical reactions is called?

Description : The relative tendency of the atoms to at- tract electrons in chemical reactions is called?

Last Answer : Electronegativity

Which one of the following is correct sequence for the flow of electrons in the energy-fixing reactions of photosynthesis? a. Water—photosystem 1—photosystem II—NADPH b. Photosystem I—NADPH—water—photosystem II c. Water------ photosystem II------ photosystem I—NADPH d. NADPH—photosystem Il—photosystem I—water

Description : Which one of the following is correct sequence for the flow of electrons in the energy-fixing reactions of photosynthesis? a. Water-photosystem 1-photosystem II-NADPH b. Photosystem I-NADPH-water- ... --- photosystem II------ photosystem I-NADPH d. NADPH-photosystem Il-photosystem I-water

Last Answer : d. NADPH—photosystem Il—photosystem I—water

The early response in asthma is due to activity. a. Cytotoxic T Cell b. Basophil c. TH2 Cell And NI( Cell d. Dendritic Cells

Description : The early response in asthma is due to activity. a. Cytotoxic T Cell b. Basophil c. TH2 Cell And NI( Cell d. Dendritic Cells

Last Answer : c. TH2 Cell And NI( Cell

Explain construction and working of Ni- Cd cell with diagram.

Description : Explain construction and working of Ni- Cd cell with diagram.

Last Answer : Construction: i) Positive plates are made up of nickel plated tubes, containing a mixture of nickel oxide (NiO2) & hydroxide + 17% flakes of graphite or metallic nickel for increasing ... which small quantity of lithium hydroxide (LiOH) is added to increase the capacity of cell.

Fibrinolytic therapy is based on activation of plasminogen, the inactive proteolytic enzyme of plasma that binds to fibrin during the formation of thrombosis. Activation of plasminogen to plasmin results in selective thrombolysis at the fibrin clot surface. Which of the following statement(s) is/are true concerning agents used in thrombolytic therapy? a. Streptokinase is a bacterial protein which is antigenic in humans, resulting in allergic reactions in up to l5% of cases b. Tissue plasminogen activator acts directly on plasmin without an intermediate drug–plasmin complex c. The half-life of urokinase, streptokinase, and TPA all exceed 30 minutes d. Streptokinase is significantly cheaper than urokinase or TPA

Description : Fibrinolytic therapy is based on activation of plasminogen, the inactive proteolytic enzyme of plasma that binds to fibrin during the formation of thrombosis. Activation of plasminogen to plasmin results ... TPA all exceed 30 minutes d. Streptokinase is significantly cheaper than urokinase or TPA

Last Answer : Answer: a, b, d Streptokinase is a bacterial protein produced by group C b-hemolytic streptococci. It is therefore antigenic in humans and can be associated with allergic reaction in ... one agent over the other. Streptokinase however, is markedly less expensive than either urokinase or TPA

Pick out the wrong statement: (A) Chemical reactions with high activation energy are very temperature sensitive (B) A flat velocity profile exists in a plug flow reactor (C) The residence time for all the elements of fluid in case of a P.F.R. need not be same (D) Half life of a reaction increases with increased initial concentration for reaction orders more than one

Description : Pick out the wrong statement: (A) Chemical reactions with high activation energy are very temperature sensitive (B) A flat velocity profile exists in a plug flow reactor (C) The residence ... D) Half life of a reaction increases with increased initial concentration for reaction orders more than one

Last Answer : (C) The residence time for all the elements of fluid in case of a P.F.R. need not be same

Identify the type of reaction(s) in the following equations. (i)CH4 + 2O2 CO2 + 2 H2O (ii) Pb(NO3)2 + 2KI ——–>Pbl2 + 2KNOs (iii) CaO + H2O ——–> Ca(OH)2 (iv) CuSO4 + Zn ——–> ZnSO4 + Cu -Chemistry

Description : Identify the type of reaction(s) in the following equations. (i)CH4 + 2O2 CO2 + 2 H2O (ii) Pb(NO3)2 + 2KI ——–>Pbl2 + 2KNOs (iii) CaO + H2O ——–> Ca(OH)2 (iv) CuSO4 + Zn ——–> ZnSO4 + Cu -Chemistry

Last Answer : Answer. (i) Combustion reaction and oxidation reaction. (ii)Double displacement reaction and precipitation reaction. (iii) Combination reaction. (iv) Displacement reaction.

What is the atomic number of Zn ?

Description : What is the atomic number of Zn ?

Last Answer : The atomic number of Zn is 30

Zn + 2HCl ? Reaction If you do What? Is it

Last Answer : zn + 2hcl = zncl2 + h2

Diamond structure can be considered as ZnS (Zinc blend) structure in which each `Zn^(2+)` in alternate tetrahedral void and `S^(2-)` in cubic close pa

Description : Diamond structure can be considered as ZnS (Zinc blend) structure in which each `Zn^(2+)` in alternate tetrahedral void and `S^(2-)` in cubic close pa

Last Answer : Diamond structure can be considered as ZnS (Zinc blend) structure in which each `Zn^(2+)` in alternate tetrahedral void ... . 6.92 Å C. 1.73 Å D. 3 Å

Find the work done is calorie when `65.5g` Zn reacts with excess `H_(2)SO_(4)` (aq) to form `ZnSO_(4)` & `H_(2)` in a closed rigid vessel at `300 K`.

Description : Find the work done is calorie when `65.5g` Zn reacts with excess `H_(2)SO_(4)` (aq) to form `ZnSO_(4)` & `H_(2)` in a closed rigid vessel at `300 K`.

Last Answer : Find the work done is calorie when `65.5g` Zn reacts with excess `H_(2)SO_(4)` (aq) to form `ZnSO_(4)` & `H_ ... `. A. -600 B. 0 C. `-1200` D. `-2494`

Assertion:- `ZN^(+2)` is more polarising than `Mg^(+2)`. Reason :- A pseudo inert gas configuration `Zn^(+2)` has high `Z_(eff)`, Then inert gas confi

Description : Assertion:- `ZN^(+2)` is more polarising than `Mg^(+2)`. Reason :- A pseudo inert gas configuration `Zn^(+2)` has high `Z_(eff)`, Then inert gas confi

Last Answer : Assertion:- `ZN^(+2)` is more polarising than `Mg^(+2)`. Reason :- A pseudo inert gas ... is False. D. If both Assertion & Reason are false

Givecn that : `Zn+1//2O_(2)rarr ZnO+84000` cal ……………1 `Hg+1//2O_(2)rarr HgO+21700` cal …………2 The heat of reaction `(Delta H)` for, `Zn+HgO rarr ZnO+Hg

Description : Givecn that : `Zn+1//2O_(2)rarr ZnO+84000` cal ……………1 `Hg+1//2O_(2)rarr HgO+21700` cal …………2 The heat of reaction `(Delta H)` for, `Zn+HgO rarr ZnO+Hg

Last Answer : Givecn that : `Zn+1//2O_(2)rarr ZnO+84000` cal 1 `Hg+1//2O_(2)rarr HgO+21700` cal 2 ... cal B. 62300 cal C. `-105700` cal D. `-62300` cal

Assertion :- In the reaction `Zn(s)+cu^(+2)(aq)rarrZn^(+2)(aq)+Cu(s)` `Cu^(+2)` ions act as oxidising agent and Zn atoms act as a reducing agent. Reas

Description : Assertion :- In the reaction `Zn(s)+cu^(+2)(aq)rarrZn^(+2)(aq)+Cu(s)` `Cu^(+2)` ions act as oxidising agent and Zn atoms act as a reducing agent. Reas

Last Answer : Assertion :- In the reaction `Zn(s)+cu^(+2)(aq)rarrZn^(+2)(aq)+Cu(s)` `Cu^(+2)` ions ... the Reason is False. D. If both Assertion & Reason are False.

`Zn+H_(2)SO_(4)rarrZnSO_(4)+H_(2)` Zn undergoes -

Description : `Zn+H_(2)SO_(4)rarrZnSO_(4)+H_(2)` Zn undergoes -

Last Answer : `Zn+H_(2)SO_(4)rarrZnSO_(4)+H_(2)` Zn undergoes - A. Reduction B. Oxidation C. Both oxidation and reduction D. None of these