12th Standard Syllabus & Materials
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TN 12th Computer Applications மின்னணு தரவு பரிமாற்றம் Sample Question Papers Study Material - QB365 Set A
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TN 12th Computer Applications மின் - வணிக பாதுகாப்பு அமைப்புகள் Sample Question Papers Study Material - QB365 Set A
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TN 12th Computer Applications மின்னணு செலுத்தல் முறைகள் Sample Question Papers Study Material - QB365 Set A
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TN 12th Computer Applications மின் - வணிகம் Sample Question Papers Study Material - QB365 Set A
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TN 12th Computer Applications திறந்த மூல கருத்துருக்கள் Sample Question Papers Study Material - QB365 Set A
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TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A
Published on: 13/10/2020
12th Standard Chemistry English Medium Free Online Test Book Back One Mark Questions - Part Two
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 X is _______.
None of these
2.
The button cell used is watches function as follows
Zn (s) + Ag2O (s) + H2O (l) ⇌ 2Ag (s) + Zn2+ (aq) + 2OH-(aq) the half cell potentials are Ag2O (s) + H2O (l) + 2e- → 2Ag (s) + 2OH- (aq) Eo = 34V and Zn (s) → Zn2+ (aq) + 2e− E0 = 0.76V . The cell potential will be_______.
0.84V
1.34V
1.10V
0.42V
3.
The solubility of BaSO4 in water is 2.42 × 10-3gL-1 at 298K. The value of its solubility product(Ksp) will be (Given molar mass of BaSO4 =233g mol-1)
1.08 × 10-14mol2L-2
1.08 × 10-12mol2L-2
1.08 × 10-10mol2L-2
1.08 × 10-8mol2L-2
4.
Among the following graphs showing variation of rate constant with temperature (T) for a reaction, the one that exhibits Arrhenius behavior over the entire temperature range is _______.
both (b) and (c)
5.
The ratio of close packed atoms to tetrahedral hole in cubic packing is ________.
1:1
1:2
2:1
1:4
6.
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
7.
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
8.
An element belongs to group 15 and 3rd period of the periodic table, its electronic configuration would be_______.
1s2 2s2 2p4
1s2 2s2 2p3
1s2 2s2 2p6 3s2 3p2
1s2 2s2 2p6 3s2 3p3
9.
Which among the following is not a borane?
B2H6
B3H6
B4H10
none of these
10.
Which one of the following reaction represents calcinations?
\(2Zn+{ O }_{ 2 }\rightarrow 2ZnO\)
\(2ZnS+3O_{ 2 }\rightarrow 2ZnO+2SO_{ 2 }\)
\(MgCO_{ 3 }\rightarrow MgO+CO_{ 2 }\)
Both (a) and (c)
1.
Hydroboration - Anti Markownikoff product
CH3 – CH2 –CH2 – CH2 – CH2 – OH
2.
Anodic Oxidation: (Reverse the given reaction)
(Eoox ) = 0.76 V Cathodic reduction
Eocell = (Eoox )+ (Eored)
= 0.76 + 0.34 = 1.1 V
3.
BaSO4 ⇌ Ba2+ + SO42-
Ksp = (s) (s)
Ksp = (s)2
= (2.42 × 10-3gL-1)2
\(=\frac{2.42 \times 10^{-3} gL^{-1}}{233 \text{ g mol}^{-1}}\)
= (0.01038 x 10-3)2
= (1.038 x x 10-5)2
= 1.077 x 10-10
= 1.08 × 10-10mol2L-2
4.
\(k=A{ e }^{ -\left( \frac { { E }_{ a } }{ RT } \right) }\)
In k = In A - \({ \left( \frac { { E }_{ a } }{ R } \right) }\) \(\left( \frac { 1 }{ T } \right) \)
This equation is of the form of a straight line y = mx+c
A plot of In k Vs \(\left( \frac { 1 }{ T } \right) \) gives a straight line with a negative slope.
5.
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
6.
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.
7.
(a)
Ti
8.
(d)
1s2 2s2 2p6 3s2 3p3
9.
(b)
B3H6
10.
(c)
\(MgCO_{ 3 }\rightarrow MgO+CO_{ 2 }\)
12th Standard Syllabus & Materials
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