Multiple Choice QuestionsWhich of the following complex neutralises three molecules of AgNO3?
[Co(NH3)6]Cl3
[Co(NH3)5Cl]Cl2
[Co(NH3)4Cl2]Cl
[Co(NH3)3Cl3]
Elements which generally exhibit multiple oxidation states and whose ions are usually coloured are
metalloids
non- metals
tranistion elements
gases
C.
tranistion elements
Transition elements exhibit multiple oxidation states because transition elements have their valence electrons in two different sets of orbitals, i.e. (n -l)d and ns. Since there is very little difference in the energies of these orbitals, both energy levels can be used for bond formation.
Note: First and last member of transition series doesn't exhibit multiple oxidation states.
The transition metals mostly are
diamagnetic
paramagentic
neither diamagnetic nor paramagnetic
both diamagnetic and paramagnetic.
The correct statement in respect of d-block elements is
they are all metals
they show variable valency
they form coloured ions and complex salts
All the above statements are correct
On reduction of KMnO4, by oxalic acid in acidic medium, the oxidation number of Mn changes. What is the magnitude of this change?
From 7 to 2
From 6 to 2
From 5 to 2
From 7 to 4
Zinc and mercury do not show variable valency like d-block elements because
they are soft
their d- shells are complete
they have only two electron in the outer most sub shell
Their d- shell are completed
The transition metals mostly are
diamagnetic
paramagnetic
neither diamagnetic nor paramagnetic
both diamagnetic and paramagnetic
The formula of a phosphate of a metal M, is MPO4. The formula of its nitrate will be
MNO3
M(NO)2
M(NO3)3
M2(NO3)3
Switch
