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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 1 Mark Questions 2020 - Part Three
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.
Oxidation takes place at _________ and reduction takes place at ________.
anode, cathode
cathode, anode
anode
cathode
2.
The cell constant of a conductivity cell is _______.
l x a
\(\frac{a}{l}\)
\(\frac{l}{a}\)
\(\frac{l^2}{a}\)
3.
HCl is a strong acid since _______.
It can be easily oxidised
It can be easily ionised
It dissociates completely to give H+ ions in solution
It can be easily oxidised and It can be easily ionised
4.
Which of the following vitamins is water soluble?
Vitamin E
Vitamin K
Vitamin A
Vitamin B
5.
Which one of the following will not undergo Hofmann bromamide reaction.
CH3CONHCH3
CH3CH2CONH2
CH3CONH2
C6H5CONH2
6.
In the reaction Ethanol \(\overset { { PCl }_{ 5 } }{ \longrightarrow } X\overset { alc.KOH }{ \longrightarrow } Y\overset { { H }_{ 2 }{ SO }_{ 4 }/{ H }_{ 2 }O }{ \underset { 298k }{ \longrightarrow } } Z.\) The ‘Z’ is ______.
ethane
ethoxyethane
ethylbisulphite
ethanol
7.
Which one of the following is an example for homogeneous catalysis?
manufacture of ammonia by Haber’s process
manufacture of sulphuric acid by contact process
hydrogenation of oil
Hydrolysis of sucrose in presence of all HCl
8.
Which of these is not likely to act as Lewis base?
BF3
PF3
CO
F–
9.
The hybridisation and shape of SF6 is respectively?
sp3d2, square planar
sp3d2, octahedral
sp3d see-saw
sp3d, trigonal bipyramidal
10.
If electrical conductivity is found to be same in all directions through a solid the substance is ________ solid and the property is called _________.
crystalline, isotropy
amorphous, isotropy
crystalline, anisotropy
amorphous, isotropy
11.
An element with atomic mass 60 having fee structure has a density of 6.23g/cm3. What is the edge length of unit cell?
200 Pm
300 Pm
400 Pm
500 Pm
12.
What is the relation between diamond and graphite?
Polymorphous
Isomer
Isotope
Isomorphous
13.
SiO44- ion has ____ geometry.
Triangular
Tetrahedral
Linear
Pentagonal bipyramidal
14.
If the standard electrode potential (Eo) of a metal is ________ and __________ the metal is a powerful reducing agent.
large, negative
large, positive
small, negative
small, positive
15.
Which one of the following exhibits highest oxidation state?
Ni
Mn
V
Zr
16.
Magnetic separation it is based on the difference in the_________ of the ore and the impurities.
magnetic properties
chemical properties
physical properties
melting point
17.
Which of the following will give respective metal by self reduction?
Galena (Pbs)
HgS
ZnS
Both (a) & (b)
18.
Consider the following statements and identify the incorrect statement(s).
(i) CN- is a powerful ligand.
(ii) Hemoglobin is a monomer and myoglobin is a tetramer.
(iii) Cis - Pt (NH3)2Cl2 is an anti-tumor drug.
only (i)
only (ii)
only (iii)
both (i) and (iii)
19.
Among the following complexes the one which shows zero crystal field stabilisation energy is _______.
[Mn(H2O)6]3+
[Fe(H2O)6]3+
[CO(H2O)6]2+
[CO(H2O)6]3+
20.
Consider the following statements:
(i) increase in concentration of the reactant increases the rate of a zero order reaction.
(ii) rate constant k is equal to collision frequency A if Ea = 0
(iii) rate constant k is equal to collision frequency A if Ea = ∞
(iv) a plot of ln (k) vs T is a straight line.
(v) a plot of ln (k) vs \(\left( \frac { 1 }{ T } \right) \) is a straight line with a positive slope.
Correct statements are
(ii) only
(ii) and (iv)
(ii) and (v)
(i), (ii) and (v)
21.
The number of unit cells in 8 gm of an element X (atomic mass 40) which crystallizes in bcc pattern is (NA is the Avogadro number)________.
6.023 x 1023
6.023 x 1022
60.23 x 1023
\(\left( \frac { 6.023\times { 10 }^{ 23 } }{ 8\times 40 } \right) \)
22.
Oxidation state of Iron and the charge on the ligand NO in [Fe(H2O)5NO]SO4 are_______.
+2 and 0 respectively
+3 and 0 respectively
+3 and -1 respectively
+1 and +1 respectively
23.
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
24.
Solid (A) reacts with strong aqueous NaOH liberating a foul smelling gas(B) which spontaneously burn in air giving smoky rings. A and B are respectively_________.
P4(red) & PH3
P4(white) & PH3
S8 & H2S
P4(white) & H2S
25.
In diborane, the number of electrons that accounts for banana bonds is ________.
six
two
four
three
1.
(a)
anode, cathode
2.
(c)
\(\frac{l}{a}\)
3.
(c)
It dissociates completely to give H+ ions in solution
4.
(d)
Vitamin B
5.
(a)
CH3CONHCH3
6.
7.
(d)
Hydrolysis of sucrose in presence of all HCl
8.
BF3 → electron deficient → Lewis acid
PF3 → electron rich → Lewis base
CO → having lone pair of electron → Lewis base
F → unshared pair of electron → Lewis base
9.
(b)
sp3d2, octahedral
10.
(b)
amorphous, isotropy
11.
(c)
400 Pm
12.
(a)
Polymorphous
13.
(b)
Tetrahedral
14.
(a)
large, negative
15.
(b)
Mn
16.
(a)
magnetic properties
17.
(d)
Both (a) & (b)
18.
(b)
only (ii)
19.
(b)
[Fe(H2O)6]3+
20.
(rate constant K is equal to collision frequency A if Ea = 0)
In zero order reactions, increase in the concentration of reactant does not alter the rate.
So statement (i) is wrong.
\(k=A{ e }^{ -\left( \frac { { E }_{ a } }{ RT } \right) }\)
if Ea = 0 so, statement (ii) is correct, and statement (iii) is wrong
k = Ae0
k = A
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
So statement (iv) and (v) are wrong.
21.
In bcc unit cell,
2 atoms = 1 unit cell
Number of atoms in 8 g of element is, Number of moles = 8g / 40 g mol-1 = 0.2 mol
1 mole contains 6.023 x1023 atoms
0.2 mole contains 0.2 x 6.023 x 1023 atoms
[1 unit cell / 2 atoms] x 0.2 x 6.023 x 1023
= 6.023 x 1022 unit cells.
22.
[\( \overset{+}{Fe}\)(H2O)5\( \overset{+}{NO}\)]2+ SO2-4
+1 and +1 respectively
23.
(a)
Ti
24.
(b)
P4(white) & PH3
25.
(c)
four
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