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For the first order thermal decomposition reaction, the following data were obtained:
Time / sec Totalpressure / atm
0 0.30
300 0.50
Calculate the rate constant
(Given: log 2 = 0.301, log3 = 0.4771, log 4 = 0.6021)
Concept: Factors Influencing Rate of a Reaction
The rate constant of a first order reaction increases from 4 × 10−2 to 8 × 10−2 when the temperature changes from 27°C to 37°C. Calculate the energy of activation (Ea). (log 2 = 0.301, log 3 = 0.4771, log 4 = 0.6021)
Concept: Temperature Dependence of the Rate of a Reaction
A first order reaction takes 23.1 minutes for 50% completion. Calculate the time required for 75% completion of this reaction.
(log 2 = 0.301, log 3 = 0.4771, log 4 = 0.6021)
Concept: Half Life Period of a Reaction
A reaction is second order with respect to a reactant. How is the rate of reaction affected if the concentration of the reactant is doubled?
Concept: Factors Influencing Rate of a Reaction
Which metal in the first transition series (3d series) exhibits + 1 oxidation state most frequently and why?
Concept: General Properties of the Transition Elements (d-block)
Which of the following cations are coloured in aqueous solutions and why ?
Sc3+, V3+, Ti4+, Mn2+ (At. Nos. Sc = 21, V = 23, Ti = 22, Mn = 25)
Concept: General Properties of the Transition Elements (d-block)
How would you account for the following?
Transition metals exhibit variable oxidation states.
Concept: General Properties of the Transition Elements (d-block)
Complete the following chemical equations:
`(i) Cr_2O_7^(2-)+6Fe^(2+)+14H^+ ->`
`(ii) 2CrO_4^(2-)+2H^+ ->`
`(iii) 2MnO_4^-+5C_2O_4^(2-)+16H^+ ->`
Concept: General Properties of the Transition Elements (d-block)
Complete the following equations:
Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
Complete the following equations: Cr2O72- + 14H+ + 6I →
Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co
Answer the following: Write the element which shows maximum number of oxidation states. Give reason.
Concept: General Properties of the Transition Elements (d-block)
The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co
Answer the following: Which element has the highest m.p?
Concept: General Properties of the Transition Elements (d-block)
The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co
Answer the following: Which element shows only +3 oxidation state?
Concept: General Properties of the Transition Elements (d-block)
The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co
Answer the following: Which element is a strong oxidising agent in +3 oxidation state and why?
Concept: General Properties of the Transition Elements (d-block)
Why do the transition elements have higher enthalpies of atomisation?
Concept: General Properties of the Transition Elements (d-block)
In 3d series (Sc to Zn), which element has the lowest enthalpy of atomisation and why?
Concept: General Properties of the Transition Elements (d-block)
Complete the following equation:
\[\ce{2MnO4- + 6H+ + 5NO2- ->}\]
Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
What are the consequences of lanthanoid contraction?
Concept: F-block Elements >> The Lanthanoids
How would you account for the following?
Zr (Z = 40) and Hf (Z = 72) have almost identical radii.
Concept: General Properties of the Transition Elements (d-block)
Write the formula of Tetraminodichloroplatinum (IV) chloridex.
Concept: Nomenclature of Coordination Compounds - Formulas of Mononuclear Coordination Entities
