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
The transition metals mostly are
diamagnetic
paramagentic
neither diamagnetic nor paramagnetic
both diamagnetic and paramagnetic.
B.
paramagentic
Paramagnetism is a property due to the presence of unpaired electrons. In case of transition metals, as they contain unpaired electrons in the (n -l)d orbitals, most of the transition metal ions and their compounds are paramagnetic.
Note: Sc3+, Ti4+(d0- system) Cu+ and Zn2+ (d10- system) are diamagnetic.
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
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