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Explain the following methods to protect metals from corrosion:
Galvanization
Concept: Occurrence of Metals
Explain the following methods to protect metals from corrosion:
Passivation
Concept: Occurrence of Metals
Which one of the following oxidation state of Manganese is unstable?
(a) + 2
(b) + 4
(c) + 5
(d) + 7
Concept: Oxidation Reduction
In Van Arkel method of refining metal, impure zirconium is converted to unstable volatile
compound by heating it with _______.
(A) oxygen
(B) chlorine
(C) bromine
(D) iodine
Concept: General Principles and Processes of Isolation of Elements >> Principles and Methods of Extraction - Concentration
Describe ‘froth floatation process’ for concentration of sulphide ore.
Concept: Refining of Crude Metals
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.
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
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
