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
The d-block elements consists mostly of
mono-valent metals
all non-metals
elements which generally form stoichiometric metal oxide
many metals with catalytic properties
Which one of the following is an example of non-typical transition elements?
Li, K, Na
Be, Al, Pb
Zn, Cd, Hg
Ba, Ca, Sr
Which of the following statement is not correct?
La(OH)3 is less basic than Lu(OH)3.
In lanthanide series ionic radius of Lu3+ ion decreases.
La is actually an element of transition series rather lanthanide.
Atomic radius of Zr and Hf are same because of lanthanide contraction.
E°= -0.44V for the reaction, Fe2+ + 2e- → Fe and E°= -0.76 V for the reaction, Zn2+ + 2e- → Zn. Which of the following statement is correct?
Fe is more electropositive
Zn is more electropositive
Zn is more electronegative
None of the above
Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?
Vanadium (Z = 23)
Manganese (Z = 25)
Chromium (Z= 24)
Iron (Z = 26)