d and f Block Elements MCQs | Question – Paper 2


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
A
4
B
5
C
6
D
3
Question 2
Cyanide process is used for extraction of
A
Ag
B
Ni
C
Pt
D
Zn
Question 3
Identify the ore not containing iron
A
chalcopyrites
B
carnallite
C
siderite
D
limonite
Question 4
Heating mixture of Cu2O and Cu2S will give
A
Cu + SO2
B
Cu + SO3
C
CuO + CuS
D
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

A
[Au(CN)2]- and [ZN(CN)4]2-
B
[Au(CN)4]3- and [ZN(CN)4]2-
C
[Au(CN)4]2- and [ZN(CN)4]2-
D
[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
A
Sn and Ag
B
Pb and Zn
C
Ag and Au
D
Fe and Ni
Question 7
Extraction for zinc blende is achieved by
A
electrolytic reduction
B
roasting followed by reduction with carbon
C
roasting followed by reduction with another metal
D
roasting followed by self reduction
Question 8
Formation of coloured solution is possible when metal ion in the compound contains
A
paired electrons
B
unpaired electrons
C
lone pair of electrons
D
none of these
Question 9
Gold is extracted by hydro metallurgical process, based on its property
A
of being electropositive
B
of being less reactive
C
to form complexes which ani water soluble
D
to form salts which are water soluble
Question 10
Identify the incorrect statement among the following
A
d-Block elements show irregular and erratic chemical properties among themselves
B
La and Lu have partially filled d orbitals and no other partially filled orbitals
C
The chemistry of various lanthanoids is very similar
D
4f and 5f orbitals are equally shielded
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