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Published on: 13/05/2022
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Questions + Answers key
Take MCQ Chemistry Test1.
Which of the following oxidation states is most common among the lanthanoids?
+4
+2
+5
+3
2.
Which of the following lanthanoid ions is diamagnetic?
Eu2+
Yb2+
Ce2+
Sm2+
3.
Which one of the following statements related to lanthanons is incorrect?
Europium shows +2 oxidation state
The basicity decreases as the ionic radius decreases from Pr to Lu.
All the lanthanons are much more reactive than aluminium
Ce4+ solutions are widely used as oxidising agents in volumetric analysis.
4.
When a brown compound of Mn (A) is treated with HCl, it gives a gas (B). The gas (B) taken in excess reacts with NH3 to give an explosive compound (C). The compound A, B and C are ________.
MnO2, Cl2, NCl3
MnO, Cl2, NH4Cl
Mn3O4, Cl2, NCl3
MnO3, Cl2, NCl2
5.
The number of moles of acidified KMnO4 required to oxidize 1 mole of ferrous oxalate(FeC2O4) is _______.
5
3
0.6
1.5
1.
(d)
+3
2.
Yb2+ - 4f14 - no unpaired electrons - diamagnetic
3.
As we move from La to Lu, their metallic behaviour because almost similar to that of aluminium.
4.
(a)
MnO2, Cl2, NCl3
5.
+7 +2+3 2+ 3+ 4+
MnO4- + FeC2O4 ⟶ Mn2+ + Fe3+ + 2CO2
5e- acception 3e- release
5 moles of FeC2O4 \(\equiv\) 3 moles of KMnO4
1 mole of FeC2O4 \(\equiv\) (3/5) moles of KMnO4
1 mole of FeC2O4 \(\equiv\) 0.6 moles of KMnO4
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