CBSE
Multiple Choice QuestionsAssuming complete ionisation, same moles of which of the following compounds will require the least amount of acidified KMnO4 for complete oxidation?
FeSO4
FeSO3
FeC2O4
FeC2O4
Which of the following exhibits only +3 oxidation states?
U
Th
Ac
Ac
Which one of the following compounds is a peroxide?
KO2
BaO2
MnO2
MnO2
Gadolinium belongs to 4f series. Its atomic number is 64. which of the following is the correct electronic configuration of gadolinium?
[Xe]4f8 6d2
[Xe]4f95s1
[Xe]4f7 5d16s2
[Xe]4f7 5d16s2
Which of the following ions will exhibit colour in aqueous solutions?
La3+ (Z = 57)
Ti3+ (Z = 22)
Lu3+
Lu3+
The catalytic activity of transition metals and their compounds is ascribed mainly to
their magnetic behaviour
their unfilled d- orbitals
their ability to adopt variable oxidation states
their ability to adopt variable oxidation states
Acidified K2Cr2O7 solution turns green when Na2SO3 is added to it. This is due to the formation of
CrO42-
Cr2(SO3)3
CrSO4
CrSO4
Which of the statements given below is incorrect?
Cl2O7 is an anhydride of perchloric acid
O3molecule is bent
ONF is isoelectronic with NO2
ONF is isoelectronic with NO2
For the four successive transition elements (Cr, Mn, Fe and Co), the stability of +2 oxidation state will be there in which of the following order?
(At. no. Cr = 24, Mn = 25, Fe = 26, Co = 27)
Fe > Mn > Co> Cr
Co > Mn > Fe > Cr
Cr > Mn > Co > Fe
Cr > Mn > Co > Fe
Which of the following oxidation states is the most common among the lanthanoids
4
2
5
5
