28
MCQ (Multiple Correct Answer)
Which of the following ions show higher spin only magnetic moment value?
A
$\mathrm{Ti}^{3+}$
B
$\mathrm{Mn}^{2+}$
C
$\mathrm{Fe}^{2+}$
D
$\mathrm{Co}^{3+}$
29
MCQ (Multiple Correct Answer)
Transition elements form binary compounds with halogens. Which of the following elements will form $\mathrm{MF}_3$ type compounds?
A
Cr
B
Co
C
Cu
D
Ni
30
MCQ (Multiple Correct Answer)
Which of the following will not act as oxidising agents?
A
$\mathrm{CrO}_3$
B
$\mathrm{MoO}_3$
C
$\mathrm{WO}_3$
D
$\mathrm{CrO}_4^{2-}$
31
MCQ (Multiple Correct Answer)
Although +3 is the characteristic oxidation state for lanthanoids but cerium also shows +4 oxidation state because
A
it has variable ionisation enthalpy
B
it has a tendency to attain noble gas configuration
C
it has a tendency to attain $f^0$ configuration
D
it resembles $\mathrm{Pb}^{4+}$
32
Subjective
Why does copper not replace hydrogen from acids?
Explanation
Copper not replace hydrogen from acids because Cu has positive $E^{\circ}$ value, i.e., less reactive than hydrogen which has electrode potential 0.00 V .