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Questions and Answers
In which scenario does a change in oxidation number occur?
In which scenario does a change in oxidation number occur?
Which actinoid element does not commonly exhibit variable oxidation states?
Which actinoid element does not commonly exhibit variable oxidation states?
Ferrates (VI) are formed in alkaline media but decompose readily to:
Ferrates (VI) are formed in alkaline media but decompose readily to:
Which member of the first transition series does not commonly display variable oxidation states?
Which member of the first transition series does not commonly display variable oxidation states?
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Given pH values x and y for Cr2O7^2- and CrO4^2-, respectively, what are the possible pH values?
Given pH values x and y for Cr2O7^2- and CrO4^2-, respectively, what are the possible pH values?
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When an excess of KCN is added to a solution of CuSO4, what is the final product obtained?
When an excess of KCN is added to a solution of CuSO4, what is the final product obtained?
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What is the oxidation number of Pt atom in [Pt(Py)4] part of the complex?
What is the oxidation number of Pt atom in [Pt(Py)4] part of the complex?
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Which pair of species has the same number of unpaired electrons?
Which pair of species has the same number of unpaired electrons?
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Which hybrid state is associated with low spin octahedral complex?
Which hybrid state is associated with low spin octahedral complex?
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How does hydrazine act as a ligand?
How does hydrazine act as a ligand?
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Arrange the following complex entities in increasing order of electrical conductivity in aqueous solution.
Arrange the following complex entities in increasing order of electrical conductivity in aqueous solution.
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What is the oxidation number of Pt atom in the latter part of the compound [Pt(Py)4] [PtCl4]?
What is the oxidation number of Pt atom in the latter part of the compound [Pt(Py)4] [PtCl4]?
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If the volume of a container is reduced to 1/4 of the initial volume, how many times will the rate of the reaction be compared to the initial rate, according to the given information?
If the volume of a container is reduced to 1/4 of the initial volume, how many times will the rate of the reaction be compared to the initial rate, according to the given information?
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In a reaction A + B products, if the order of A is 1 and the order of B is 1/2, by what factor will the rate increase when concentrations of both A and B are increased four times?
In a reaction A + B products, if the order of A is 1 and the order of B is 1/2, by what factor will the rate increase when concentrations of both A and B are increased four times?
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In a first-order reaction, if the concentration of the reactant decreases from 1.0 M to 0.25 M in 20 minutes, what is the rate constant of the reaction?
In a first-order reaction, if the concentration of the reactant decreases from 1.0 M to 0.25 M in 20 minutes, what is the rate constant of the reaction?
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If 99% of a first-order reaction was completed in 32 minutes, how long will it take for 99.9% of the reaction to complete?
If 99% of a first-order reaction was completed in 32 minutes, how long will it take for 99.9% of the reaction to complete?
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If doubling the initial concentration of a reactant also doubles the half-life (t½) of the reaction, what is the order of the reaction?
If doubling the initial concentration of a reactant also doubles the half-life (t½) of the reaction, what is the order of the reaction?
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In a first-order reaction, if the concentration of a reactant decreases from 1.0 M to 0.25 M in 20 minutes, how does this affect the rate constant?
In a first-order reaction, if the concentration of a reactant decreases from 1.0 M to 0.25 M in 20 minutes, how does this affect the rate constant?
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In which of the following equilibrium reactions would the equilibrium shift to the right side if the total pressure is decreased?
In which of the following equilibrium reactions would the equilibrium shift to the right side if the total pressure is decreased?
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What is the pH of a solution containing 2 × 10^−3 moles of OH− ions in a 2-liter solution?
What is the pH of a solution containing 2 × 10^−3 moles of OH− ions in a 2-liter solution?
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In the expression α = 0.1 × C−1, where C is the concentration of the acid, what is the pH of the solution?
In the expression α = 0.1 × C−1, where C is the concentration of the acid, what is the pH of the solution?
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Which set of solutions shows the common ion effect?
Which set of solutions shows the common ion effect?
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If H2S is a weak acid and ionizes into 2H+ and S^–2, what can be inferred about its dissociation?
If H2S is a weak acid and ionizes into 2H+ and S^–2, what can be inferred about its dissociation?
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Which equilibrium reaction represents a reaction that can shift to the right side when temperature is decreased?
Which equilibrium reaction represents a reaction that can shift to the right side when temperature is decreased?
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What is the consequence of attempting more than 10 questions in a candidate's exam?
What is the consequence of attempting more than 10 questions in a candidate's exam?
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When NH4Cl is added to a solution of NH4OH, what happens to the concentrations of OH- and NH4+ ions?
When NH4Cl is added to a solution of NH4OH, what happens to the concentrations of OH- and NH4+ ions?
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Which ion does not give the borax bead test?
Which ion does not give the borax bead test?
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In a reaction involving AgCl and Na3AsO3, what is the observation?
In a reaction involving AgCl and Na3AsO3, what is the observation?
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What is formed when HNO3 is added to sodium ferrocyanide?
What is formed when HNO3 is added to sodium ferrocyanide?
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Which pair(s) of ions form precipitates upon passing H2S gas in the presence of dilute HCl?
Which pair(s) of ions form precipitates upon passing H2S gas in the presence of dilute HCl?
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Study Notes
Chemical Reactions
- Rate of reaction: If the volume of a container is reduced to 1/4 of its initial volume, the rate of reaction will increase by a factor of 8.
- Order of reaction: The order of a reaction is 1 for A and 1/2 for B, so when the concentration of both A and B are increased four times, the rate will increase by a factor of 8.
First-Order Reactions
- Concentration of reactant: If the concentration of a reactant is decreased from 1.0 M to 0.25 M in 20 minutes, the rate constant of the reaction is 0.6931 min-1.
- Time for completion: 99% of a first-order reaction is completed in 32 minutes, so 99.9% of the reaction will be completed in approximately 50 minutes.
Order of Reaction
- Effect of concentration on rate: If doubling the initial concentration of a reactant doubles the half-life of the reaction, then the order of the reaction is 0.
Chemistry of Transition Elements
- Ionization: Fe3+ has a magnetic moment of 3.9 B.M.
- Oxidation states: Actinoids do not show a common and variable oxidation state.
Complexes
- Ferrates (VI) are formed in alkaline media but readily decompose to Fe3O4 + O2.
- pH values: Cr2O72- + pH = x, CrO42- + pH = y, where x and y are pH values.
Coordination Compounds
- Oxidation number: In [Pt(Py)4] [PtCl4], the oxidation number of Pt is +2 and +4 respectively.
- Unpaired electrons: [CoF6]3- and [FeF6]3- have the same number of unpaired electrons.
Electrolytic Conductivity
- Increasing order of electrical conductivity: [Co(NH3)4Cl2]Cl < K2[PtCl6] < [Cr(NH3)6]Cl3 < [Pt(NH3)6]Cl4.
Chemical Equilibrium
- Shift in equilibrium: If the total pressure is decreased, the equilibrium would shift to the right side in the reaction N2(g) + 3H2(g) 2NH3(g).
pH and pOH
- pH calculation: If a solution has 2 × 10-3 moles of OH- ions in 2 liters of solution, the pH of the solution is 11.
- Degree of dissociation: The degree of dissociation of acetic acid is given by the expression α = 0.1 × C-1, where C is the concentration of the acid.
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Description
Test your knowledge on oxidation numbers in chemistry with this quiz. Identify cases where there is a change in oxidation number and common/variable oxidation states of actinoids. Determine which compounds exhibit variable oxidation states.
