| 1 |
The colour of a transition metal complex is due to d-d transition The colour of the complex is the complementary of the colour absorbed. Thus [Ti(H2O6]3+abosrbs yellow light and transmits blue and red colours therefore the solution of titanium complex appears |
Blue
Red
Yellow
Mixture of blue and red or violet
|
| 2 |
All 3d series elements show variable oxidation states. The one shown by all 3d elements is |
+2
+3
+4
+5
|
| 3 |
Fe+3and Mn2+are strong paramagnetic because the number of unpaired electrons in each is |
4
5
6
7
|
| 4 |
d-block elements closely resemble in their physical and chemical properties. Which statement is incorrect |
They show variable valency
Their ions and compounds are coloured
They are good conductors of heat and electricity
Their compounds are diamagnetic
|
| 5 |
CuSO4. 5H2O is used to prepare |
Transition complex
Fehling's 'A' sol
Fehling's 'B' sol
Fehling's sol
|
| 6 |
IIB elements (Zn, Cd, Hg) and III B elements (Sc, Y and La) are |
Non typical transition element
Typical transition element
Normal elements
Inner transition element
|
| 7 |
Which element belong to 5d series |
V
Nb
Pd
Hf
|
| 8 |
Which element does not belong to 4d series |
Y
Zr
Mo
Zn
|
| 9 |
Which element does not belong to 3d transition series |
Ti
V
Mn
Te
|
| 10 |
In the electronic configuration of Cr one electron from 4s sub-shell is transfered to 3d sub-shell because |
The 3rd orbital is of lower energy than 4s
The 4s orbital is of equal energy to 3d orbital
The half filled d-subshell is more stable than incomplete d-sub shell
6 unpaired electrons make Cr more paramagnetic
|
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