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The d-And-f-Block Elements
Question
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Why is K2Cr2O7 generally preferred over Na2Cr2O7 in volumetric analysis although both are oxidising agents?

Answer

K2Cr2O7 generally preferred over Na2Cr2O7 in volumetric analysis because Na2Cr2O7 is hygroscopic, hence it is difficult to prepare its standard solution for volumetric analysis, but because of no hygroscopic nature of K2Cr2O7 its standard solution can be prepared.

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Some More Questions From The d-And-f-Block Elements Chapter

In the series Sc (Z = 21) to Zn(Z = 30), the enthalpy of atomisation of zinc is the lowest i.e., 26, kJ mol. Why?

The E° (M2+/M) value for copper is positive (+ 0.34 V). What is possibility the reason for this? 

How would you account for the irregular variation of ionisation enthalpies (first and second) in the first series of the transition elements?

Why is the highest oxidation state of a metal exhibited in its oxide or fluoride only?

Which is a stronger reducing agent Cr2+ or Fe2+ and why?

Explain why Cu+ ion is not stable in aqueous solutions?

Actinoid contraction is greater from element to element than lanthanoid contraction. Why?

On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?

The outer electronic configuration of copper is 3d10 4s1, yet it is considered transition element. Why?