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Published on: 13/10/2020
12th Standard Chemistry English Medium Free Online Test Volume 1 One Mark Questions 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.
Activation energy of a reactant is reduced by ________.
increased temperature
reduced temperature
increased pressure
reduced pressure
2.
In a second order reaction, if one of the concentration is excess, the order of the reaction is ________ order reaction.
first
pseudo first
third
zero
3.
For the reaction N2(g) + 3H2(g) ⟶ 2NH3(g) the rate of the reaction in terms of ammonia is ______.
\(+\frac { 1 }{ 2 } \frac { -d\left[ { NH }_{ 3 } \right] }{ dt } \)
\(-\frac { 1 }{ 2 } \frac { d\left[ { NH }_{ 3 } \right] }{ dt } \)
\(\frac { -d\left[ { NH }_{ 3 } \right] }{ dt } \)
\(\frac { +d\left[ { NH }_{ 3 } \right] }{ dt } \)
4.
When the Ea of a reaction zero then the rate constant of the reaction is equal to _______.
2.303 K
\(\frac { K }{ 2.303 } \)
\(\left( { t }_{ \frac { 1 }{ 2 } } \right) \)
A
5.
For a complex reaction _____.
Order of overall reaction is same as molecularity of the slowest step.
Order of overall reaction is less than the molecularity of the slowest step.
Order of overall reaction is greater than molecularity of the slowest step.
None of these above.
6.
The rate of a reaction is expressed as k[A]2[B]1, the reaction is said to be _____.
second order with respect to A
first order with respect to B
overall order of the reaction is third order
all the above
7.
The excess energy which a molecule must possess to become active is known as _____.
kinetic energy
threshold energy
potential energy
activation energy
8.
Which of the above graphs is correct for zero order reactions?
I, II
I, III
I, IV
II, III
9.
How much time will be taken for 20 gm to reduce 5 g? [R = 2 x 10-3s-1 (I order reaction)]
693.1 s
693.1 s-1
6.931 s
6.931 s-1
10.
The addition of a catalyst during a chemical reaction alters which of the following quantities?
Activation energy
Entropy
Internal energy
Enthalpy
11.
Which order reaction obeys the expression \({ t }_{ \frac { 1 }{ 2 } }\alpha \frac { 1 }{ \left[ A \right] } ?\)
First
Second
Third
Zero
12.
A+B \(\longrightarrow \) C; ∆H = 60 kJ mol-1 Eaf = 150 kJ. What is the activation energy of the backward reaction?
210 kJ
105 kJ
90 kJ
145 kJ
13.
For a reaction, 2A + B ⟶ 3C, The rate of appearance of C at time 't' is 1.2 x 10-4 mol L-1s-1. Identify the rate of reaction.
4 x 10-5mol L-1s-1
4.5 x 10-1mol L-1s-1
3.6 x 10-4 mol L-1s-1
None of these
14.
The coordination number of each sphere in body centred cubic packing is _______.
2
4
6
8
15.
An example of covalent crystalline solid is ______.
NaI
AI
Si
Ar
16.
Pick out the alloy that contains a non-metal as a constituent in it ________.
Brass
Bronze
Steel
Invar
17.
Magnetic moment is given by the formula _______.
\(\sqrt { n(n+1) } \)
\(\sqrt { n(n+2) } \)
\(\sqrt { (n+2) } \)
\(\sqrt { { n }^{ 2 }+(n+2) } \)
18.
Structural formula of tetra aqua dichlorido Chromium (III) chloride _______.
[Cr(H2O)4Cl2]Cl2
[Cr(H2O)4Cl3]
[(H2O)4Cl2Cr]Cl2
[Cl2(H2O)4Cr]Cl3
19.
The addition of a catalyst during a chemical reaction alters which of the following quantities?
Enthalpy
Activation energy
Entropy
Internal energy
20.
As per IUPAC guidelines, the name of the complex [Co(en)2(ONO)Cl]Cl is _______.
chloro bis ethylenediamine nitrocobalt(III) chloride
chloridobis(ethane-1, 2-diamine)nitro K-O Cobaltate(III) chloride
chloridobis(ethane-1, 2-diammine)nitrito K-O Cobalt(II) chloride
chloridobis(ethane-1, 2-diamine)nitrito K-O Cobalt(III) chloride
21.
The correct order of increasing oxidizing power in the series _______.
VO2+ < Cr2O72- < MnO4-
Cr2O72- < VO2+ < MnO4-
Cr2O72- < MnO4- < VO2+
MnO4- < Cr2O72- < VO2+
22.
In the brown ring test, brown colour of the ring is due to _______.
a mixture of No and NO2
Nitroso ferrous sulphate
Ferrous nitrate
Ferric nitrate
23.
The element that does not show catenation among the following p-block elements is ________.
Carbon
silicon
Lead
germanium
24.
Which one of the following ores is best concentrated by froth – floatation method?
Magnetite
Haematite
Galena
Cassiterite
25.
1.
(a)
increased temperature
2.
(b)
pseudo first
3.
(a)
\(+\frac { 1 }{ 2 } \frac { -d\left[ { NH }_{ 3 } \right] }{ dt } \)
4.
(d)
A
5.
(a)
Order of overall reaction is same as molecularity of the slowest step.
6.
(d)
all the above
7.
(d)
activation energy
8.
(c)
I, IV
9.
(a)
693.1 s
10.
(a)
Activation energy
11.
(b)
Second
12.
(c)
90 kJ
13.
(a)
4 x 10-5mol L-1s-1
14.
(d)
8
15.
(c)
Si
16.
(c)
Steel
17.
(b)
\(\sqrt { n(n+2) } \)
18.
(a)
[Cr(H2O)4Cl2]Cl2
19.
A catalyst provides a new path to the reaction with low activation energy. i.e., it lowers the activation energy.
20.
(d)
chloridobis(ethane-1, 2-diamine)nitrito K-O Cobalt(III) chloride
21.
+5 +6 +7
VO2+ < Cr2O72- < MnO4-
Greater the oxidation state, higher is the oxidising power.
22.
(b)
Nitroso ferrous sulphate
23.
(c)
Lead
24.
(c)
Galena
25.
(a)
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