(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

(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
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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)
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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

Identify the substances that are oxidised and the substances which are reduced in the following reactions. (i) 4Na(s) + O2(g) → 2Na2O(s) (ii) CuO (s) + H2(g) → Cu (s) + H2O(l) -Chemistry-10

Description : Identify the substances that are oxidised and the substances which are reduced in the following reactions. (i) 4Na(s) + O2(g) → 2Na2O(s) (ii) CuO (s) + H2(g) → Cu (s) + H2O(l) -Chemistry-10

Last Answer : (i) Substances oxidised is Na as it gains oxygen and oxygen is reduced. (ii) Substances reduced is Cu as hydrogen is oxidised as it gains oxygen.

What information do you get from the following chemical equation: Zn(s) + 2HCl (dil) → ZnCl2 (aq) + H2(g)

Description : What information do you get from the following chemical equation: Zn(s) + 2HCl (dil) → ZnCl2 (aq) + H2(g)

Last Answer : This gives zinc chloride and hydrogen. The word equation is: Zinc + Hydrochloric acid → Zinc chloride + Hydrogen Formulae for the products are ZnCl2 and H2

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.

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.

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

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.

Determine the values of equilibrium constant (Kc) and ΔG° for the following reaction : Ni(s) + 2Ag+ (aq) → Ni2+ (aq) + 2Ag(s), E° = 1.05 V (1F = 96500 C mol-1 -Chemistry

Description : Determine the values of equilibrium constant (Kc) and ΔG° for the following reaction : Ni(s) + 2Ag+ (aq) → Ni2+ (aq) + 2Ag(s), E° = 1.05 V (1F = 96500 C mol-1 -Chemistry

Last Answer : According to the formula ΔG° = -nFE° = – 2 × 96500 ×1.05 or ΔG° = -202650 J mol-1 = -202.65 KJ mol-1 Now ΔG° ⇒ -202650 J Mol-1 R = 8.314 J/Mol/K, T = 298 K

As the surface area of the Zn(s) used in the reaction Zn(s) + 2HCl(aq)--> ZnCl2(aq) + H2(g) is increased, the rate of the reaction willIncreaseDecreaseRemain the Same?

Description : As the surface area of the Zn(s) used in the reaction Zn(s) + 2HCl(aq)--> ZnCl2(aq) + H2(g) is increased, the rate of the reaction willIncreaseDecreaseRemain the Same?

Last Answer : An increase in surface area means an increase in the rate of reaction.

Sodium reacts with water to form sodium hydroxide and hydrogen gas. The balanced equation which represents the above reaction is (a) Na(s) + 2H20(l) → 2NaOH(aq) + 2H2(g) (b) 2Na(s) + 2H2O(l) → 2NaOH(aq) +H2(g) (c) 2Na(s) + 2H20(l) → NaOH(aq) + 2H2(g) (d) 2Na(s) + H20(l) - 2NaOH(aq) + 2H2(g)

Description : Sodium reacts with water to form sodium hydroxide and hydrogen gas. The balanced equation which represents the above reaction is (a) Na(s) + 2H20(l) → 2NaOH(aq) + 2H2(g) (b) 2Na(s) + 2H2O(l) → 2NaOH(aq) +H2(g) (c) 2Na(s) + 2H20(l) → NaOH(aq) + 2H2(g) (d) 2Na(s) + H20(l) - 2NaOH(aq) + 2H2(g)

Last Answer : Answer: (b)

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

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

Last Answer : What is the answer ?

The cytosolic superoxide dismutase enzyme contains (A) Cu2+ (B) Cu2+ and Zn2+ (C) Zn2+ (D) Mn2+

Description : The cytosolic superoxide dismutase enzyme contains (A) Cu2+ (B) Cu2+ and Zn2+ (C) Zn2+ (D) Mn2+

Last Answer : Answer : B

Cytochrome oxidase contains (A) Cu2+ and Zn2+ (B) Cu2+ and Fe2+ (C) Cu2+ and Mn2+ (D) Cu2+

Description : Cytochrome oxidase contains (A) Cu2+ and Zn2+ (B) Cu2+ and Fe2+ (C) Cu2+ and Mn2+ (D) Cu2+

Last Answer : Answer : B

Cytosolic superoxide dismutase contains (A) Cu2+ and Zn2+ (B) Mn2+ (C) Mn2+ and Zn2+ (D) Cu2+ and Fe2+

Description : Cytosolic superoxide dismutase contains (A) Cu2+ and Zn2+ (B) Mn2+ (C) Mn2+ and Zn2+ (D) Cu2+ and Fe2+

Last Answer : Answer : A

Describe construction and working of H2-O2 fuel cell.

Description : Describe construction and working of H2-O2 fuel cell.

Last Answer : Construction :- )One of the simplest & most successful fuel cell is hydrogen oxygen fuel cell. ii) It consists essentially of an electrolytic solution such as 25% KOH or NaOH ... . Hydrogen & oxygen gases are bubbled through the anode & cathode compartment respectively.

(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

In the reaction 2Li(s)+2H2O(l) ➝ 2LiOH(aq)+H2(g), which compound is in the gaseous state?

Description : In the reaction 2Li(s)+2H2O(l) ➝ 2LiOH(aq)+H2(g), which compound is in the gaseous state?

Last Answer : H2

Define fuel cell. Give the advantages and limitations of H2-O2 fuel cell.

Description : Define fuel cell. Give the advantages and limitations of H2-O2 fuel cell.

Last Answer : Fuel cell: Fuel cell is an electrochemical cell which converts the chemical energy of fuel directly into the electrical energy by an electrochemical process, in which the fuel is oxidized at the anode. OR ... requires 30% of the stored energy. 7. Life span of the cells is not accurately known.

Zn + 2 HCl = H2 + ZnCl, is an example of which type of reaction? (1) Double displacement reaction (2) Combination reaction (3) Single displacement reaction (4) Decomposition reaction

Description : Zn + 2 HCl = H2 + ZnCl, is an example of which type of reaction? (1) Double displacement reaction (2) Combination reaction (3) Single displacement reaction (4) Decomposition reaction

Last Answer : (3) Single displacement reaction Explanation: This reaction is an example of single displacement reaction. In Substitution or Single Replacement Reactions, a single free element replaces or is substituted for one of the elements in a compound.

Which of the following chemical reactions will be favoured by low pressure? (A) 2HI ⇌ H2 + I2 (B) N2O2 ⇌ 2NO2 (C) N2 + O2 ⇌ 2NO (D) None of these

Description : Which of the following chemical reactions will be favoured by low pressure? (A) 2HI ⇌ H2 + I2 (B) N2O2 ⇌ 2NO2 (C) N2 + O2 ⇌ 2NO (D) None of these

Last Answer : (B) N2O2 ⇌ 2NO2

Write the balanced equation for the following chemical reactions. (i) Hydrogen + Chlorine → Hydrogen chloride (ii) Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride (iii) Sodium + Water → Sodium hydroxide + Hydrogen -Chemistry-10

Description : Write the balanced equation for the following chemical reactions. (i) Hydrogen + Chlorine → Hydrogen chloride (ii) Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride (iii) Sodium + Water → Sodium hydroxide + Hydrogen -Chemistry-10

Last Answer : (i) H2 + Cl2 → 2HCl (ii) 3 BaCl2 + Al2(SO4)3 → BaSO4 + 2 AlCl3 (iii) 2Na + 2H2O → 2NaOH + H2↑

Which of the following produces H2 gas, when reacts with acid? (1) Zn (2) S (3) C (4) O

Description : Which of the following produces H2 gas, when reacts with acid? (1) Zn (2) S (3) C (4) O

Last Answer : (1) Zn Explanation: As, Zinc is a metal so it will produce H2 gas when reacts with acid. Active metals react with acids to produce hydrogen because they are above hydrogen in the activity series.

Naphtha in a fertiliser plant is used as a source of (A) Fuel (B) H2 (C) N2 (D) O2

Description : Naphtha in a fertiliser plant is used as a source of (A) Fuel (B) H2 (C) N2 (D) O2

Last Answer : (B) H2

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-

The following reaction is characteristic of what type of enzymes? 2H2O2 → 2H2O + O2 (A) Peroxides (B) Catalase (C) Dehydrogenase (D) Copper containing oxidases

Description : The following reaction is characteristic of what type of enzymes? 2H2O2 → 2H2O + O2 (A) Peroxides (B) Catalase (C) Dehydrogenase (D) Copper containing oxidases

Last Answer : Answer : B

In the reaction, C6H12O6 + 6O2 6CO2 + 6H2O + energy, which component is → being reduced? A- O2 B- CO2 C- .H2O D- Energy

Description : In the reaction, C6H12O6 + 6O2 6CO2 + 6H2O + energy, which component is → being reduced? A- O2 B- CO2 C- .H2O D- Energy

Last Answer : O2

Consider the reaction, C + O2 ⇌ CO2; ΔH = - 94 kcal. What will be the value of ΔH for the reaction CO2 → C + O2? (A) -94 kcal (B) +94 kcal (C) > 94 kcal (D) < -94 kcal

Description : Consider the reaction, C + O2 ⇌ CO2; ΔH = - 94 kcal. What will be the value of ΔH for the reaction CO2 → C + O2? (A) -94 kcal (B) +94 kcal (C) > 94 kcal (D) < -94 kcal

Last Answer : (B) +94 kcal

In the reaction, C + O2 → CO2; ΔH = - 94 kcal. What is the heat content (enthalpy) of O2? (A) -94 kcal (B) > -94 kcal (C) < - 94 kcal (D) Zero

Description : In the reaction, C + O2 → CO2; ΔH = - 94 kcal. What is the heat content (enthalpy) of O2? (A) -94 kcal (B) > -94 kcal (C) < - 94 kcal (D) Zero

Last Answer : (D) Zero

Identify the compound X and A on the basis of the reaction given below. X +Zn A + H2 (a)X is Sodium hydroxide and A is sodium zincate (b)X is Sodium hydroxide and A is sodium chloride©X is sodium hyroxide and A is sodium ethanoate (d)Both a and c

Description : Identify the compound X and A on the basis of the reaction given below. X +Zn A + H2 (a)X is Sodium hydroxide and A is sodium zincate (b)X is Sodium hydroxide and A is sodium chloride©X is sodium hyroxide and A is sodium ethanoate (d)Both a and c

Last Answer : (a)X is Sodium hydroxide and A is sodium zincate

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`

Brass is an alloy of : (1) Cu, Al and Zn (2) Cu and Sn (3) Cu and Zn (4) Al and Mg

Description : Brass is an alloy of : (1) Cu, Al and Zn (2) Cu and Sn (3) Cu and Zn (4) Al and Mg

Last Answer : (3) Cu and Zn Explanation: Brass is an alloy made of copper and zinc. The proportions of zinc and copper can be varied to cre-ate a range of brasses with varying properties. By comparison, bronze is principally an alloy of copper and tin.

Brass is an alloy of : (1) Cu, Al and Zn (2) Cu and Sn (3) Cu and Zn (4) Al and Mg

Description : Brass is an alloy of : (1) Cu, Al and Zn (2) Cu and Sn (3) Cu and Zn (4) Al and Mg

Last Answer : Cu and Zn

Which of the following reactions is not involved in extraction of Cu from copper pyrite ?

Description : Which of the following reactions is not involved in extraction of Cu from copper pyrite ?

Last Answer : Which of the following reactions is not involved in extraction of Cu from copper pyrite ? A. `Cu_(2)S * Fe_(2 ... 2)` D. `FeO+ SiO_(2) rarr FeSiO_(3)`

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

In which of the following reaction equilibrium, the value of equilibrium constant Kp will be more than is Kc? (A) 2HI ⇌ H2 + I2 (B) N2O4 ⇌ 2NO2 (C) 2SO2 + O2 ⇌ 2SO3 (D) None of these

Description : In which of the following reaction equilibrium, the value of equilibrium constant Kp will be more than is Kc? (A) 2HI ⇌ H2 + I2 (B) N2O4 ⇌ 2NO2 (C) 2SO2 + O2 ⇌ 2SO3 (D) None of these

Last Answer : (B) N2O4 ⇌ 2NO2

(a) Write the essential condition for the following reaction to take place: 2AgBr—-> 2Ag + Br2 Write one application of this reaction. (b) Complete the following chemical equation of a chemical reaction 2FeS04 — chemical-reactions-and-equations-chapter-wise-important-questions-class-10-science-5 (c) What happens when water is added to quick line. Write chemical equation. -Chemistry

Description : (a) Write the essential condition for the following reaction to take place: 2AgBr--> 2Ag + Br2 Write one application of this reaction. (b) Complete the following chemical equation of a chemical ... science-5 (c) What happens when water is added to quick line. Write chemical equation. -Chemistry

Last Answer : Answer. This reaction is used in photography. (c) Slaked lime is formed with hissing sound and lot of heat is envolved.

CuO + H2 = Cu + H2O. This equation is an example of - (1) Oxidation (2) Decomposition (3) Reduction (4) Redox

Description : CuO + H2 = Cu + H2O. This equation is an example of - (1) Oxidation (2) Decomposition (3) Reduction (4) Redox

Last Answer : (4) Redox

Two substances, A and B were made to react to form a third substance, A2B according to the following reaction 2A + B → A2 B. Which of the following statements concerning this reaction are incorrect? -Chemistry 9th

Description : Two substances, A and B were made to react to form a third substance, A2B according to the following reaction 2A + B → A2 B. Which of the following statements concerning this reaction are incorrect? -Chemistry 9th

Last Answer : (c) (i), (iii), (iv) Consider the example of H2O

Are single-displacement reactions A.AgNO3 (aq) plus NaCl (aq) AgCl (s) plus NaNO3 (aq) B.2Fe(s) plus 6HCI (g) 2FeCl3 (s) plus 3H2 (g) C.2Al (s) plus 3CuCl2 (aq) 2AlCl3 (aq) plus 3Cu?

Description : Are single-displacement reactions A.AgNO3 (aq) plus NaCl (aq) AgCl (s) plus NaNO3 (aq) B.2Fe(s) plus 6HCI (g) 2FeCl3 (s) plus 3H2 (g) C.2Al (s) plus 3CuCl2 (aq) 2AlCl3 (aq) plus 3Cu?

Last Answer : Need answer

Among the metals Na,Mg ,Al,Zn,Cu,Sn ,Fe and Pb number of metals that can be ectreated by the eletroysis ,even from aqueos solution,is………………….

Description : Among the metals Na,Mg ,Al,Zn,Cu,Sn ,Fe and Pb number of metals that can be ectreated by the eletroysis ,even from aqueos solution,is………………….

Last Answer : Among the metals Na,Mg ,Al,Zn,Cu,Sn ,Fe and Pb number of metals that can be ectreated by the eletroysis ,even from aqueos solution,is………………….

Number of metals among following which are obatained by electromentallurgy in molten state are Li, Ba, Na,Al, Fe, Cu, Pb, Sn, Ag, Zn, Ca, Mg.

Description : Number of metals among following which are obatained by electromentallurgy in molten state are Li, Ba, Na,Al, Fe, Cu, Pb, Sn, Ag, Zn, Ca, Mg.

Last Answer : Number of metals among following which are obatained by electromentallurgy in molten state are Li, Ba, Na,Al, Fe, Cu, Pb, Sn, Ag, Zn, Ca, Mg.

When the sample of Cu with Zn as impurity is to be purified by electrolysis, the appropriate electrodes are :

Description : When the sample of Cu with Zn as impurity is to be purified by electrolysis, the appropriate electrodes are :

Last Answer : When the sample of Cu with Zn as impurity is to be purified by electrolysis, the appropriate electrodes are ... 4)","Impure zinc","Impure sample"):}`

Cytosolic superoxide dismutase contains (A) Zn only (B) Cu only (C) Zn and Cu (D) Mn

Description : Cytosolic superoxide dismutase contains (A) Zn only (B) Cu only (C) Zn and Cu (D) Mn

Last Answer : Answer : C

Trace elements are a. Zn+2, Cu+2, Mn+2 b. MO6+, Ni2+, B3+ and CO2+ c. Both a and b d. None of these

Description : Trace elements are a. Zn+2, Cu+2, Mn+2 b. MO6+, Ni2+, B3+ and CO2+ c. Both a and b d. None of these

Last Answer : Ans: D

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)

The most deficient micro – nutrient in Indian soil is : (A)Cu (B) Mn (C) Zn (D) B

Description : The most deficient micro – nutrient in Indian soil is : (A)Cu (B) Mn (C) Zn (D) B

Last Answer : (C) Zn