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Published on: 13/10/2020
12th Standard Chemistry English Medium Free Online Test Volume 1 One Mark Questions with Answer Key 2020
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 incorrect statement regarding structure of ozone is______.
Bond angle is less than 120°
It is linear
The two oxygen-oxygen bond length in ozone are identical
Both (b) and (c).
2.
The type of crystal system shown is ______.
Cubic
Orthorhombic
Mono clinic
Tetragonal
3.
Which one of the following is a network solid?
diamond
silicon carbide
naphthalene
both (a) and (b)
4.
Which one of the following statements is not true?
The heat of vaporisation of ionic crystals are high
Ionic crystals are soluble in non-polar solvent
Ionic crystals are hard and brittle
Ionic crystals are conductors in solution state
5.
Three atoms P, Q and R crystallize in a cubic solid lattice having P atom at corners Q atom at body centre and R atom at the face centres. Identify formula of the compound _______.
PQR
PQR2
PQR3
P3QR
6.
An example of metal deficiency defect _______.
NaCl
AgCl
CsCl
FeS
7.
Electrode potential of M2+/M for Ni is abnormal because of ________.
high lE1 + E2
high hydration energy
ΔH atomisation
Electronic configuration of Ni2+
8.
Oxygen stabilises higher oxidation state because_______.
it is electronegative
of its tendency to form multiple bond
of large size
of small size
9.
The percentage of carbon in high carbon steel is_________.
0.5 - 1%
0.15 - 1.5%
0.15 - 1.5%
0.15 - 0.3%
10.
Magnetic moment is given by the formula _______.
\(\sqrt { n(n+1) } \)
\(\sqrt { n(n+2) } \)
\(\sqrt { (n+2) } \)
\(\sqrt { { n }^{ 2 }+(n+2) } \)
11.
Werner's theory was not able to explain_______ of coordination compounds.
colour
magnetic properties
both (a) and (b)
neither (a) nor (b)
12.
The geometry of complex ion [Fe(CN)6]4- is _______.
tetrahedral
square planar
octahedral
triangular
13.
Which of the following octahedral complexes do not show geometrical isomerism?
[Co(NH3)3Cl3]
[PtCl2(NH3)4]
[Pt(NH3)2Cl2]
[Co(en)3]3+
14.
15.
The ratio of close packed atoms to tetrahedral hole in cubic packing is ________.
1:1
1:2
2:1
1:4
16.
How many geometrical isomers are possible for [Pt(Py)(NH3)(Br)(Cl)]
3
4
0
15
17.
A magnetic moment of 1.73BM will be shown by one among the following.
TiCl4
[CoCl6]4-
[Cu(NH3)4]2+
[Ni(CN)4]2-
18.
A complex has a molecular formula MSO4Cl.6H2O. The aqueous solution of it gives white precipitate with Barium chloride solution and no precipitate is obtained when it is treated with silver nitrate solution. If the secondary valence of the metal is six, which one of the following correctly represents the complex?
[M(H2O)4Cl]SO4.2H2O
[M(H2O)6]SO4
[M(H2O)5Cl]SO4.H2O
[M(H2O)3Cl]SO4.3H2O
19.
Which one of the following statements related to lanthanons is incorrect?
Europium shows +2 oxidation state
The basicity decreases as the ionic radius decreases from Pr to Lu.
All the lanthanons are much more reactive than aluminium
Ce4+ solutions are widely used as oxidising agents in volumetric analysis.
20.
The alloy of copper that contain Zinc is________.
Monel metal
Bronze
bell metal
brass
21.
Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?
Br2 > I2 > F2 > Cl2
F2 > Cl2 > Br2 > l2
I2 > Br2 > Cl2 > F2
Cl2 > Br2 > F2 > I2
22.
On hydrolysis, PCl3 gives________.
H3PO3
PH3
H3PO4
POCl3
23.
Which of the following metals has the largest abundance in the earth’s crust?
Aluminium
Calcium
Magnesium
Sodium
24.
Which one of the following is not feasible
Zn(s) + Cu2+(aq) \(\rightarrow\) Cu(s) + Zn2+(aq)
Cu(s)+ Zn2+(aq)\(\rightarrow\) Zn(s) + Cu2+(aq)
Cu(s) + 2Ag+(ag)\(\rightarrow\) 2Ag(s) + Cu2+(aq)
Fe(s) + Cu2+(aq) \(\rightarrow\) Cu(s)+ Fe2+(aq)
25.
1.
(b)
It is linear
2.
(b)
Orthorhombic
3.
(d)
both (a) and (b)
4.
(b)
Ionic crystals are soluble in non-polar solvent
5.
(c)
PQR3
6.
(d)
FeS
7.
(d)
Electronic configuration of Ni2+
8.
(b)
of its tendency to form multiple bond
9.
(b)
0.15 - 1.5%
10.
(b)
\(\sqrt { n(n+2) } \)
11.
(c)
both (a) and (b)
12.
(c)
octahedral
13.
(d)
[Co(en)3]3+
14.
(c)
15.
If number of close packed atoms = N, then
The number of Tetrahedral holes formed = 2N
The number of Octahedral holes formed = N
Therefore, N:2N = 1:2
16.
Three isomers. If we consider any one of the ligands as reference (say Py), the arrangement of other three ligands (NH3, Br- and Cl-) with respect to (Py) gives three geometrical isomers.
17.
Ti4+ (d0 ⇒ 0BM)
Co2+ (d7 spain free ⇒ t2g5, e2g; n = 3; μ = 3.9BM)
Cu2+ (d9 Low spain ⇒ t2g6, e3g; n = 1; μ = 1.732BM)
Ni2+ (d8 Low spain ⇒ t2g6, e2g; n = 2; μ = 2.44 BM)
18.
Molecular formula: MSO4Cl.6H2O
Formation of white precipitate with Barium chloride indicates that SO2-4 ions are outside the coordination sphere, and no precipitate with AgNO3 solution indicates that the Cl- ions are inside the coordination sphere. Since the coordination number of M is 6.Cl- and 5 H2O are ligands, remaining 1 H2O molecular and SO2-4 are in the outer coordination sphere.
19.
As we move from La to Lu, their metallic behaviour because almost similar to that of aluminium.
20.
(d)
brass
21.
(d)
Cl2 > Br2 > F2 > I2
22.
(a)
H3PO3
23.
(a)
Aluminium
24.
(b)
Cu(s)+ Zn2+(aq)\(\rightarrow\) Zn(s) + Cu2+(aq)
25.
(d)
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