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Write the electronic configuration of the elements with the atomic numbers 61, 91, 101, 109
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|
0
|
2749
|
November 3, 2016
|
|
Use Hund’s rule to derive the electronic configuration
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|
1
|
2021
|
November 3, 2016
|
|
Although Zr belongs to 4d and Hf belongs to 5d transition series but it is quite difficult to separate them, why?
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0
|
2938
|
November 3, 2016
|
|
Actinoid contraction is greater from element to element than lanthanoid contraction. Why?
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0
|
2479
|
November 3, 2016
|
|
A black mineral A on treatment with dilute sodium cyanide solution
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1
|
1861
|
November 3, 2016
|
|
A violet compound of manganese 'A’ decomposes on heating to liberate oxygen
|
|
1
|
3937
|
November 3, 2016
|
|
Complete the following chemical equations
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1
|
1405
|
November 3, 2016
|
|
Explain why does colour of $KMnO _{ 4 }$ disappear when oxalic acid is added to its solution in acidic medium?
|
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0
|
1410
|
November 3, 2016
|
|
Describe the oxidising action of potassium dichromate
|
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1
|
6236
|
November 3, 2016
|
|
What can be inferred from the magnetic moment values of the following complex species?
|
|
1
|
1755
|
November 3, 2016
|
|
Comment on the statement that elements of the first transition series possess many properties different from those of heavier transition elements
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|
0
|
1501
|
November 3, 2016
|
|
Compare the general characteristics of the first series of the transition metals
|
|
1
|
2946
|
November 3, 2016
|
|
What is meant by disproportionation? Give two examples of disproportionation reaction in aqueous solution
|
|
0
|
5822
|
November 3, 2016
|
|
Why do transition elements show variable oxidation states?
|
|
1
|
9526
|
November 3, 2016
|
|
The halides of transition elements become more covalent with increasing oxidation state of the metal. Why?
|
|
0
|
4886
|
November 3, 2016
|
|
An aqueous blue coloured solution of transition metal sulphate reacts
|
|
1
|
2732
|
November 3, 2016
|
|
What are the interstitial compounds? Why are such compounds well known for transition metals?
|
|
0
|
6621
|
November 3, 2016
|
|
Predict which of the following will be coloured in aqueous solution?
|
|
0
|
856
|
November 3, 2016
|
|
Explain why ${{Cu}^{+}}$ ion is not stable in aqueous solution?
|
|
1
|
1002
|
November 3, 2016
|
|
For the first row transition metals, the E° values are given below:
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|
1
|
1885
|
November 3, 2016
|
|
Why E° values for Mn, Ni and Zn are more negative than expected?
|
|
0
|
8114
|
November 3, 2016
|
|
Which metal in the first series of transition metals exhibits + 1 oxidation state most frequently and why?
|
|
0
|
2572
|
November 3, 2016
|
|
How is the variability in oxidation states of transition metals different from that of the non-transition metals? Illustrate with examples
|
|
0
|
2462
|
November 3, 2016
|
|
Name the oxometal anions of the first series of the transition metals
|
|
1
|
1481
|
November 3, 2016
|
|
What are the transition elements? Write the two characteristics of the transition elements
|
|
0
|
4992
|
November 3, 2016
|
|
Suggest reasons why the only binary compounds of the noble gases are fluorides and oxides of Kr, Xe and Rn?
|
|
0
|
4056
|
November 3, 2016
|
|
Xenon does not form fluorides such as $XeF _{3 }$ and $XeF _{5 }$. Why?
|
|
0
|
2545
|
November 3, 2016
|
|
Why do noble gases have comparatively large atomic sizes?
|
|
0
|
2840
|
November 3, 2016
|
|
Give reason to explain why $CIF_{3 }$ exists but $FCl_{3 }$ does not exist?
|
|
0
|
836
|
November 3, 2016
|
|
Explain why the stability of oxoacids of chlorine increases in the order given below?
|
|
1
|
5886
|
November 3, 2016
|