Alloy of Cu - Sn is called
(d)
Which one is Alloy.
(c)
Value of 1 Farady is equal to
(c)
Which one is non electrolyte.
(d)
Which one is oxidizing agent.
(c)
Which one is reducing agent.
(c)
Which one forms weak electrolyte solution with water
(d)
In dry cell is used as cathode.
(b)
1g equivalent weight of Al is equal to
(a)
Which one is correct statement.
(c)
What is oxidation in terms of electron transfer?
Oxidation
Oxidation is defined as the loss of electrons by an atom, ion, or molecule. Example: Cu → Cu²⁺ + 2e⁻.
Which of the following is an example of reduction?
Reduction
Reduction involves gain of electrons. Here sulfur (S) gains electrons to form sulfide (S²⁻).
In Zn + Cl₂ → ZnCl₂, what is the oxidizing agent?
Oxidizing Agent
Cl₂ accepts electrons from Zn, making it the oxidizing agent.
What is the function of a reducing agent?
Reducing Agent
A reducing agent donates electrons to another substance.
Which is a strong electrolyte?
Strong Electrolyte
HCl dissociates completely in water.
Where does oxidation occur in an electrolytic cell?
Oxidation Site
Oxidation always occurs at the anode.
What is used in the Downs cell?
Downs Cell
Used for electrolysis of molten NaCl to produce sodium metal.
Which is a primary cell?
Primary Cell
Dry cells (Leclanché cells) are non-rechargeable primary cells.
Which alloy is Cu-Zn?
Brass
Brass is an alloy of copper and zinc.
What is rust's chemical formula?
Rust
Hydrated iron(III) oxide is the chemical name for rust.
Which method prevents corrosion by making metal a cathode?
Cathodic Protection
Used for pipelines and ship hulls by connecting to sacrificial anodes.
What is electroplating?
Electroplating
Process of depositing a metal layer on another metal using electrolysis.
What electrolyte is used in tin plating?
Tin Plating
Acidified tin sulphate (SnSO₄) provides Sn²⁺ ions for deposition on steel objects.
What is the equivalent mass of aluminum (valency=3)?
Equivalent Mass
Equivalent mass = Atomic mass/Valency = 27/3 = 9 g.
In H₂ + Cl₂ → 2HCl, the reducing agent is:
Reducing Agent
H₂ donates electrons to Cl₂, making it the reducing agent.
Which is NOT an application of electrolytic cells?
Applications
Watches use galvanic cells (batteries), not electrolytic cells.
Electron flow direction in electrolytic cells is:
Electron Flow
Electrons move from anode (oxidation) to cathode (reduction).
Which is an example of redox reaction?
Redox Reaction
Photosynthesis involves electron transfer (oxidation of water, reduction of CO₂).
Lead storage battery uses:
Lead Battery
Uses lead (anode) and lead oxide (cathode) in H₂SO₄ electrolyte.
Salt bridge function is:
Salt Bridge
Prevents charge buildup by allowing ion flow between half-cells.
Which is used in chromium plating?
Chromium Plating
Provides Cr³⁺ ions for deposition on auto parts and fixtures.
Which alloy contains Cu, Zn and Sn?
Bronze
Bronze is an alloy of copper (Cu) with tin (Sn) and sometimes zinc (Zn).
What characterizes an oxidizing agent?
Oxidizing Agent
Oxidizing agents accept electrons from other substances.
Cation movement direction in electrolytic cells is:
Cation Movement
Positive ions (cations) migrate to the negative cathode.
Which alloy is used in dental fillings?
Dental Amalgam
Mercury amalgam (Hg-Ag-Cu-Zn) is used for tooth fillings.
Chromium's oxidation state in Cr₂O₇²⁻ is:
Oxidation State
Calculated as: 2x + 7(-2) = -2 → x = +6 for Cr.
Which cell produces NaOH?
Nelson's Cell
Electrolyzes aqueous NaCl to produce NaOH, Cl₂ and H₂.
Why tin-plate steel for food cans?
Tin Plating
Tin is non-toxic and protects steel from reacting with food acids.
Carbon's oxidation state in CO₂ is:
Oxidation State
O is -2, so C must be +4 to balance: C⁺⁴O₂⁻².
Which metal makes stainless steel corrosion-resistant?
Stainless Steel
Chromium forms a protective oxide layer preventing rust.
In silver plating, the anode is made of:
Silver Plating
Silver anode dissolves to replenish Ag⁺ ions in solution.
Faraday's Second Law relates deposited mass to:
Faraday's Second Law
Mass deposited ∝ Chemical equivalent (Atomic mass/Valency).
Which battery is rechargeable?
Secondary Cell
Lead-acid batteries can be recharged by reversing current flow.
Electroplating prevents corrosion by:
Corrosion Prevention
Metal coating blocks contact with oxygen and water.
In galvanic cells, chemical energy converts to:
Galvanic Cell
Spontaneous redox reactions generate electric current.
In galvanic cells, chemical energy converts to:
Galvanic Cell
Spontaneous redox reactions generate electric current (chemical → electrical energy).
Which process occurs at the anode during electrolysis of molten NaCl?
Anode Reaction
Chloride ions are oxidized to chlorine gas at the anode.
The electrolyte in a lead-acid battery is:
Lead-Acid Battery
Uses dilute sulfuric acid (H₂SO₄) as electrolyte.
Which metal is protected by galvanization?
Galvanization
Zinc coating protects iron/steel from rusting.
In the electrochemical series, metals higher up are:
Electrochemical Series
Higher metals (like K, Na) lose electrons more easily (strong reducers).
What mass of silver (Ag=108) is deposited by 1 Faraday?
Faraday's Law
1 F deposits 1 gram-equivalent: Ag⁺ + e⁻ → Ag (108 g/mol).
Which is NOT a component of brass?
Brass Composition
Brass = Cu + Zn; Bronze contains tin.
The oxidizing agent in 2H₂ + O₂ → 2H₂O is:
Oxidizing Agent
Oxygen gains electrons (is reduced) from hydrogen.
In corrosion, the region with less moisture acts as:
Corrosion Process
Less moist areas oxidize (Fe → Fe²⁺ + 2e⁻), becoming anodic sites.
Which equation represents Faraday's First Law?
Faraday's First Law
Mass deposited (W) ∝ Current (I) × Time (t); Z = electrochemical equivalent.