Topic: d and f Block Elements, Test No.: 06, Total MCQs: 10
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Question 1 |
Which one of
the following exists in the oxidation state other than +3?
B | |
Al | |
Ce | |
Ga |
Question 2 |
Which one of
the following ions exhibits colour in aqueous solution
Sc3+ | |
Ni2+ | |
Ti4+ | |
Zn2+ |
Question 3 |
Which one of
the following is a diamagnetic ion?
CO2+ | |
Cu2+ | |
Mn2+ | |
Sc3+ |
Question 4 |
Which ore
contains both iron and copper?
Cuprite | |
Chalcocite | |
Chalcopyrite | |
Malachite |
Question 5 |
Which pair of
compounds is expected to show similar colour in aqueous medium?
FeCl2
and CuCl2 | |
VOCl2
and CuCl2 | |
VOCl2
and FeCl2 | |
FeCl2
and MnCl2 |
Question 6 |
Zn does not
show variable valency because of
complete d sub-shell | |
inert pair effect | |
4s2
sub-shell | |
None of these |
Question 7 |
When copper
pyrites is roasted in excess of air, a mixture of CuO + FeO is formed. FeO is
present as impurities. This can be removed as slag during reduction of CuO. The
flux added to form slag is:
SiO2, which is an acid flux | |
Lime stone, which is a basic flux | |
SiO2, which is basic flux | |
CaO; which is basic flux |
Question 8 |
‘Hydride Gap’
is referred to which region of the periodic table?
Groups 3, 4 and 5 | |
Groups 5, 6 and 7 | |
Groups 4, 5 and 6 | |
Groups 7, 8 and 9 |
Question 9 |
Which of the
statements is not true?
K2Cr2O7
solution in acidic medium is orange | |
K2Cr2O7
solution becomes yellow on increasing the pH beyond 7 | |
On passing H2S
through acidified K2Cr2O7 solution, a milky
colour is observed | |
Na2Cr2O7
is preferred over K2Cr2O7 in volumetric
analysis |
Question 10 |
Which one of
the following sets correctly represents the increase in the paramagnetic
property of the ion?
Cu2+
< V2+ < Cr2+ < Mn2+ | |
Cu2+
< Cr2+ < V2+ < Mn2+ | |
Mn2+
< V2+ < Cr2+ < Cu2+ | |
Mn2+
< Cu2+ < Cr2+ < V2+ |
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