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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 with Answer Key 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.
The element corresponding to the electronic configuration [Rn]5f3 6d17s2 is _________
Neptunium
Plutonium
Uranium
Americium
2.
The general electronic configuration of d-block elements can be written as ________.
[Noble gas]n - 1d1-10 ns1-2
[Noble gas]n - 1d-10 n1-6
[Noble gas]n - 2 d10 ns1-2
[Noble gas]n - 2 d10 ns1-6
3.
Electrode potential of M2+/M for Ni is abnormal because of ________.
high lE1 + E2
high hydration energy
ΔH atomisation
Electronic configuration of Ni2+
4.
Identify the correct reason for lanthanide contraction.
Decreasing nuclear charge
Decreasing screening effect
Increasing nuclear charge
Negligible screening effect
5.
The lanthanide contraction is responsible for the fact that _______.
Zr and Zn have the same oxidation state
Zr and Hf have almost the same radius
Zr and Nb have similar oxidation state
Zr and Y have similar radius
6.
Ce (Z=58) and Yb (Z=70) exhibits stable +4 and +2 oxidation states respectively. This is because_______.
Ce4+ and Yb2+acquire f7 configuration
Ce4+ and Yb2+ acquire f0 configuration
Ce4+ and Yb2+acquire f7 and f14 configuration
Ce4+and Yb2+ acquire f0 and f14 configuration
7.
Oxygen stabilises higher oxidation state because_______.
it is electronegative
of its tendency to form multiple bond
of large size
of small size
8.
Identify the paramagnetic species.
Cu+
Cr+
MnO4
Zn2+
9.
Hybridisation of chromium ions and dichromate ions is ________.
Sp2
Sp3d
both (a) and (b)
None of these
10.
Most of the transition metal ions are coloured, because of the ________.
presence of unpaired electrons
energy gap between two energy levels is very small
both (a) and (b)
neither (a) nor (b)
11.
The actinoid elements which show the highest oxidation state of +7 are _______.
Np, Pu, Am
U, Fm, Th
U, Th, Md
Es, No, Lr
12.
Which of the following lanthanoid ions is diamagnetic?
Eu2+
Yb2+
Ce2+
Sm2+
13.
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
14.
A white crystalline salt (A) react with dilute HCl to liberate a suffocating gas (B) and also forms a yellow precipitate. The gas (B) turns potassium dichromate acidified with dil H2SO4 to a green coloured solution(C). A, B and C are respectively ________.
Na2SO3, SO2, Cr2(SO4)3
Na2S2O3, SO2, Cr2(SO4)3
Na2S, SO2, Cr2(SO4)3
Na2SO4, SO2, Cr2(SO4)3
15.
Which of the following statements is not true?
on passing H2S, through acidified K2Cr2O7 solution, a milky colour is observed
Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis
K2Cr2O7 solution in acidic medium is orange in colour
K2Cr2O7 solution becomes yellow on increasing the PH beyond 7
16.
Which of the following does not give oxygen on heating?
K2Cr2O7
(NH4)2Cr2O7
KClO3
Zn(ClO3)2
17.
The correct order of increasing oxidizing power in the series _______.
VO2+ < Cr2O72- < MnO4-
Cr2O72- < VO2+ < MnO4-
Cr2O72- < MnO4- < VO2+
MnO4- < Cr2O72- < VO2+
18.
Which of the following compounds is colourless?
Fe3+
Ti4+
Co2+
Ni2+
19.
Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell?
Cr
Pd
Pt
none of these
20.
Assertion: Ce4+ is used as an oxidizing agent in volumetric analysis.
Reason: Ce4+ has the tendency of attaining +3 oxidation state.
Codes:
a) Both assertion and reason are true and reason is the correct explanation of assertion.
b) Both assertion and reason are true but reason is not the correct explanation of assertion.
c) Assertion is true but reason is false.
d) Both assertion and reason are false.
Both assertion and reason are true and reason is the correct explanation of assert
Both assertion and reason are true but reason is not the correct explanation of assertion.
Assertion is true but reason is false.
Both assertion and reason are false.
1.
(c)
Uranium
2.
(a)
[Noble gas]n - 1d1-10 ns1-2
3.
(d)
Electronic configuration of Ni2+
4.
(d)
Negligible screening effect
5.
(b)
Zr and Hf have almost the same radius
6.
(d)
Ce4+and Yb2+ acquire f0 and f14 configuration
7.
(b)
of its tendency to form multiple bond
8.
(b)
Cr+
9.
(b)
Sp3d
10.
(c)
both (a) and (b)
11.
(a)
Np, Pu, Am
12.
Yb2+ - 4f14 - no unpaired electrons - diamagnetic
13.
(a)
MnO2, Cl2, NCl3
14.
(a)
Na2SO3, SO2, Cr2(SO4)3
15.
(b)
Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis
16.
(b)
(NH4)2Cr2O7
17.
+5 +6 +7
VO2+ < Cr2O72- < MnO4-
Greater the oxidation state, higher is the oxidising power.
18.
(b)
Ti4+
19.
Cr ⇒ [Ar]3d54s1
20.
a) Both assertion and reason are true and reason is the correct explanation of assertion.
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