Class 12th
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New answer posted
a year agoContributor-Level 10
14. Higher enthalpy of hydration provides extra stability to Cu2+ oxidation state than +1 oxidation state.
Enthalpy of hydration is described as the amount of energy released on dilution of one mole of gaseous ions.
New answer posted
a year agoContributor-Level 10
34. Option (i) and (iv)
Pig iron is the iron obtained from the blast that has many impurities (Mn, P, Si, etc.) and approximately 4% carbon content. When it is re-melted or cast with the help of scrap iron, then it has less carbon content i.e. 3% as compared to pig iron.
The Zr andTi are purified by the help of Arkel Method that contain the following reaction:
Zr (s) + 2I2 ZrI4 ( g) Zr Pure (s) + 2I2
Ti + 2I2 TiI4 Ti + 2I2
Here we obtain Zr and Ti as a pure form of solid when purified using the Arkel method.
New answer posted
a year agoContributor-Level 10
13. 2Cu2+ + 4I- → Cu2I2 + I2
When Cu2+ reacts with potassium iodide white precipitate of Cu2I2 is formed.
New answer posted
a year agoContributor-Level 10
12. Transition elements have the ability to involve their d-electrons along with their s-electrons in the process of bond formation. This results in formation of strong metal-metal bonds which makes their melting point high.
New answer posted
a year agoContributor-Level 10
33. Option (ii) and (iv)
From Fig.6.1, at point B, all three lines, i.e. for the lines for all three given reactions, are below that of the line of reduction of FeO. This means, that the value of ΔG for the equivalent temperature at point B for reduction of FeO is greater than (positive) that of values of ΔG for all three reactions (negative). Thus, FeO will get reduced by all three reactions at point B. Same is the case with point E as that of point B, the value of ΔG for reduction of FeO at E is greater than the value of ΔG&nb
New answer posted
a year agoContributor-Level 10
11. Cr (24)= [Ar]3d54s2
Zn (30) = [Ar] 3d104s2
The stability of orbitals according to the electrons filled is in order:
Fully filled > half-filled > partially filled
As 3d10 is completely filled orbital of Zn is more stable than the 3d5 half-filled orbital of Cr . It is comparatively easy to remove electron from 3d5 than from 3d10.
Therefore, the first ionization enthalpy of Cr is lower than that of Zn.
New answer posted
a year agoContributor-Level 10
32. Option (i)
According to the above graph, at point D the equivalent value of ΔG for the reduction of FeO is approximately 330 units for the particular temperature. Also, for CO the equivalent value of Δ? at the particular temperature for point D is around −330 units. Thus, if we calculate the overall value of ΔG for the reduction of FeO with carbon monoxide then it is almost zero at point D.
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