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Published on: 13/10/2020
12th Standard Chemistry Transition and Inner Transition Elements English Medium Free Online Test One Mark Questions 2020 - 2021
Download Tamil Nadu 12th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Chemistry Test
1.
_________ is known as Bayer's reagent.
Hot dilute alkaline KMnO4
Cold dilute alkaline KMnO4
Hot Conc. acidic KMnO4
Cold Conc. acidic KMnO4
2.
FeSO4 on heating gives _______.
SO2 and O2
SO2 and SO3
SO2
SO3
3.
On oxidation with KMnO4 in acidic medium, SO2 is oxidised to _______.
SO2
H2SO4
SO32-
H2S
4.
The correct statement is_______.
Cu2Cl2 and Ag2S are coloured
Upon strong heating paramagnetic gases are evolved by NaNO3 and AgNO3
Green vitriol and blue vitriol are isomorphous
KMnO4 and K2Cr2O7 are coloured due to
5.
What are the species X and Y in the following?
CrO3, CrO42-
CrO3, Cr2O3
CrO4-2, Cr2O72-
H2CrO4, H2Cr2O7
6.
Which of the following is coloured due to charge transfer?
MnO4-
CrO42-
Cu2O
All of these
7.
The trend in ionisation enthalpy of a transition element is not regular because,_______.
removal of one electron alters the relative energies of 4s and 3d orbitals
due to different electronic configuration (stability)
Poor screening of 3p-orbital
due to decrease in effective nuclear charge
8.
The highest possible oxidation state shown by osmium in its compound is_______.
+4
+6
+8
+10
9.
Which of the following is wrong with respect to lanthanide contraction?
Decrease in ionic radii
Increase in tendency to act as reducing agents
Decrease in basic character
Resembles second and third row of d-block elements
10.
The catalytic activity of transition metals is due to ________.
the formation of a variety of oxidation states
the formation of intermediate products
the capability of forming interstitial compounds.
all the above
11.
The most common oxidation state of actinoids is _______.
+2
+3
+4
+6
12.
Which of the following oxidation states is most common among the lanthanoids?
+4
+2
+5
+3
13.
MnO4- react with Br- in alkaline PH to give ________.
BrO3- MnO2
Br2, MnO42-
Br2, MnO2
BrO-, MnO42-
14.
Permanganate ion changes to ________ in acidic medium.
MnO42−
Mn2+
Mn3+
MnO2
15.
16.
The alloy of copper that contain Zinc is________.
Monel metal
Bronze
bell metal
brass
17.
The catalytic behaviour of transition metals and their compounds is ascribed mainly due to _______.
their magnetic behaviour
their unfilled d orbitals
their ability to adopt variable oxidation states
their chemical reactivity
18.
The magnetic moment of Mn2+ ion is _______.
5.92BM
2.80BM
8.95BM
3.90BM
19.
Among the transition metals of 3d series, the one that has highest negative \(\left( \frac { M^{ 2+ } }{ M } \right) \) standard electrode potential is _______.
Ti
Cu
Mn
Zn
20.
Sc (Z = 21) is a transition element but Zinc (z = 30) is not because _______.
both Sc3+ and Zn2+ ions are colourless and form white compounds
In case of Sc, 3d orbital are partially filled but in Zn these are completely filled
last electron as assumed to be added to 4s level in case of zinc
both Sc and Zn do not exhibit variable oxidation states
1.
(b)
Cold dilute alkaline KMnO4
2.
(b)
SO2 and SO3
3.
(b)
H2SO4
4.
(b)
Upon strong heating paramagnetic gases are evolved by NaNO3 and AgNO3
5.
(a)
CrO3, CrO42-
6.
(d)
All of these
7.
(a)
removal of one electron alters the relative energies of 4s and 3d orbitals
8.
(c)
+8
9.
(b)
Increase in tendency to act as reducing agents
10.
(d)
all the above
11.
(b)
+3
12.
(d)
+3
13.
(a)
BrO3- MnO2
14.
MnO-4 + 8H+ + 5e- → Mn2+ + 4H2O
15.
(b)
16.
(d)
brass
17.
(c)
their ability to adopt variable oxidation states
18.
Mn2+ ⇒ 3d5 contains 5 unpaired electrons
n = 5,
\( \sqrt{n(n+ 2)} \) BM
\(= \sqrt{5(5+ 2)} = \sqrt{35} = 5.92 BM\)
19.
(a)
Ti
20.
(b)
In case of Sc, 3d orbital are partially filled but in Zn these are completely filled
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