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What happens to the rate constant k and activation energy Ea as the temperature of a chemical reaction is increased? Justify.
Concept: Temperature Dependence of the Rate of a Reaction
Account for the following:
Cr2+ is a strong reducing agent.
Concept: General Properties of the Transition Elements (d-block)
When chromite ore FeCr2O4 is fused with NaOH in presence of air, a yellow-coloured compound (A) is obtained, which on acidification with dilute sulphuric acid gives a compound (B). Compound (B) on reaction with KCl forms an orange coloured crystalline compound (C).
(i) Write the formulae of the compounds (A), (B) and C.
(ii) Write one use of compound (C).
Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
Complete the following chemical equation
8MnO4- + 3S2O32- + H2O →
Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
What are the transition elements? Write two characteristics of the transition elements.
Concept: General Properties of the Transition Elements (d-block)
How would you account for the following:
Actinoid contraction is greater than lanthanoid contraction.
Concept: F-block Elements >> The Actinoids
How would you account for the following : Transition metals form coloured compounds
Concept: General Properties of the Transition Elements (d-block)
Complete the following equation :
`2MnO_4^(-)+6H^++5NO_2^(-)rarr`
Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
Account for the following:
Cu+ ion is unstable in aqueous solution.
Concept: General Properties of the Transition Elements (d-block)
Complete the following equations:Cr2O72- + 2OH- →
Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
Complete the following equations : MnO4- + 4H+ + 3e- →
Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
With reference to structural variability and chemical reactivity, write the differences between lanthanoids and actinoids
Concept: F-block Elements >> The Actinoids
Name a member of the lanthanoid series which is well known to exhibit +4 oxidation state.
Concept: F-block Elements >> The Lanthanoids
Out of Mn3+ and Cr3+, which is more paramagnetic and why ?
(Atomic nos. : Mn = 25, Cr = 24)
Concept: General Properties of the Transition Elements (d-block)
Complete the following chemical equation
Cr2O72- + 3Sn2+ + 14H+ →
Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
Explain why Cu+ ion is not stable in aqueous solutions?
Concept: General Properties of the Transition Elements (d-block)
How is the variability in oxidation states of transition metals different from that of the non-transition metals? Illustrate with examples.
Concept: General Properties of the Transition Elements (d-block)
Indicate the steps in the preparation of KMnO4 from pyrolusite ore.
Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
How would you account for the following?
Transition metals and their compounds act as catalysts.
Concept: General Properties of the Transition Elements (d-block)
Complete the following chemical equations :
Cu + H2SO4(conc.) →
Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
