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Write features of Ellingham's diagrams
Concept: Thermodynamic Principles of Metallurgy
The chemical formula of willemite is __
(a) ZnS
(b) ZnCO3
(c) ZnO
(d) Zn2SiO4
Concept: Occurrence of Metals
The half-life period of zero order reaction A → product is given by
(a) `([A]_0)/k`
(b) `0.693/k`
(c) `[A]_0/(2k)`
(d) `(2[A]_0)/k`
Concept: Half Life Period of a Reaction
Write the chemical equations involved in van Arkel method for refining zirconium metal.
Concept: Refining of Crude Metals
What is the action of carbon on the following metal oxides:
Fe2O3 in the blast furnace
Concept: Oxidation Reduction
What is the action of carbon on the following metal oxides :
ZnO in the vertical retort furnace
Concept: Oxidation Reduction
In Van Arkel method for refining zirconium or titanium, the halogen used is __________.
Concept: General Principles and Processes of Isolation of Elements >> Principles and Methods of Extraction - Concentration
The half life period of a first order reaction is 6. 0 h . Calculate the rate constant
Concept: Half Life Period of a Reaction
What is the role of the following compound-
SiO2 in the extraction of copper from copper pyrites?
Concept: Occurrence of Metals
In a first-order reaction A → product, 80% of the given sample of compound decomposes in 40 min. What is the half-life period of the reaction?
Concept: Half Life Period of a Reaction
Answer the following in one or two sentences.
What is the relationship between coefficients of reactants in a balanced equation for an overall reaction and exponents in the rate law? In what case the coefficients are the exponents?
Concept: Molecularity of Elementary Reactions
Answer the following in one or two sentences.
Why all collisions between reactant molecules do not lead to a chemical reaction?
Concept: Collision Theory of Bimolecular Reactions
Answer the following in brief.
How instantaneous rate of reaction is determined?
Concept: Rate of Reactions
A reaction takes place in two steps:
- \[\ce{NO_{(g)} + Cl2_{(g)} -> NOCl2_{(g)}}\]
- \[\ce{NOCl2_{(g)} + NO_{(g)} -> 2NOCl_{(g)}}\]
- Write the overall reaction.
- Identify the reaction intermediate.
- What is the molecularity of each step?
Concept: Molecularity of Elementary Reactions
Answer the following in brief.
Obtain the relationship between the rate constant and half-life of a first-order reaction.
Concept: Integrated Rate Equations
What are pseudo-first-order reactions?
Concept: Integrated Rate Equations
Answer the following in brief.
Explain graphically the effect of temperature on the rate of reaction.
Concept: Temperature Dependence of Reaction Rates
Solve
The half-life of a first-order reaction is 1.7 hours. How long will it take for 20% of the reactant to react?
Concept: Integrated Rate Equations
Show that the time required for 99.9% completion of a first-order reaction is three times the time required for 90% completion.
Concept: First Order Reactions
How will you determine activation energy from rate constants at two different temperatures?
Concept: Temperature Dependence of Reaction Rates
