Multiple Choice QuestionsAn element with atomic number 21 is a
halogen
representative element
transition element
alkali metal
Mercury is a liquid metal because
it has a completely filled s orbital
it has a small atomic size
it has a completely filled d orbital that prevents d-d overlapping of orbitals
it has a completely filled d orbital that causes d-d overlapping
In chromite ore, the oxidation number of iron, and chromium are respectively
+3,+2
+3,+6
+2,+6
+2,+3
In chromite ore, the oxidation number of iron and chromium are respectively
+3, +2
+3, +6
+2, +6
+2, +3
In a transition series, with increase in atomic-number, the paramagnetism
increases gradually
decreases gradually
first increases to a maximum and then decreases
first decreases to a minimum and then increases
C.
first increases to a maximum and then decreases
The paramagnetism of transition elements of a given series increases on moving left to rght in a period and attain a maximum value and after that, it goes on decreasing towards the end of period. This is due to the fact that the magnetic moment or paramagnetism is directly related to the number of half-filled d-orbitals. In the beginning, the number of unpaired electrons in d-orb1tals increases till the middle of the period (d1 to d5). After this, the pairing of electrons occurs in d-orbitals (d6 to d10).
Thus, in a given transition senes, with increases in atomic-number, the paramagnetism first increases
to a maximum and then decreases.
Which of the following is a negatively charged bidentate ligand?
Cyano
Ethylene diamine
Acetato
Dimethyl glyoximato
The electronic configuration of Cu2+ ion is
[Ar] 3d8 4s1
[Ar] 3d9 4s0
[Ar] 3d7 4s2
[Ar] 3d8 4s0
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