Topic: d and f Block Elements, Test No.: 02, Total MCQs: 10
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Question 1 |
How many ‘d’
electrons are in present Cr2+ ion
4 | |
5 | |
6 | |
3 |
Question 2 |
Cyanide
process is used for extraction of
Ag | |
Ni | |
Pt | |
Zn |
Question 3 |
Identify the
ore not containing iron
chalcopyrites | |
carnallite | |
siderite | |
limonite |
Question 4 |
Heating
mixture of Cu2O and Cu2S will give
Cu + SO2 | |
Cu + SO3 | |
CuO + CuS | |
Cu2SO3 |
Question 5 |
During the extraction of gold the following reactions take place
Au +CN- + H2O 
[X]
[X] + Zn ¾® [Y] + Au
X and Y are respectively
[Au(CN)2]- and [ZN(CN)4]2- | |
[Au(CN)4]3- and [ZN(CN)4]2- | |
[Au(CN)4]2- and [ZN(CN)4]2- | |
[Au(CN)2]- and [ZN(CN)6]4- |
Question 6 |
During the
process of electrolytic refining of copper, some metals present as impurity
settle as ‘anode mud’ These are
Sn and Ag | |
Pb and Zn | |
Ag and Au | |
Fe and Ni |
Question 7 |
Extraction
for zinc blende is achieved by
electrolytic reduction | |
roasting followed by reduction with carbon | |
roasting followed by reduction with another metal | |
roasting followed by self reduction |
Question 8 |
Formation of
coloured solution is possible when metal ion in the compound contains
paired electrons | |
unpaired electrons | |
lone pair of electrons | |
none of these |
Question 9 |
Gold is
extracted by hydro metallurgical process, based on its property
of being electropositive | |
of being less reactive | |
to form complexes which ani water soluble | |
to form salts which are water soluble |
Question 10 |
Identify the
incorrect statement among the following
d-Block elements show irregular and erratic chemical properties among themselves | |
La and Lu have partially filled d orbitals and no other partially filled orbitals | |
The chemistry of various lanthanoids is very similar | |
4f and 5f orbitals are equally shielded |
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