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Mock Test - 2 - Class 12 MCQ

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30 Questions MCQ Test - Mock Test - 2

Mock Test - 2 for Class 12 2024 is part of Class 12 preparation. The Mock Test - 2 questions and answers have been prepared according to the Class 12 exam syllabus.The Mock Test - 2 MCQs are made for Class 12 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Mock Test - 2 below.

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Mock Test - 2 - Question 1

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Of the following acids
   I. Hypophosphorous acid
   II. Orthophosphorous acid
   III. Caro’s acid
   IV. Glycine

A.
a
B.
b
C.
c
D.
d

Detailed Solution for Mock Test - 2 - Question 1

Oxyacids have acidic H, which are bonded as OH group to non metal

Hypophosphorous acid

Orthophosphorous acid

Caro’s acid

Glycine is an α-amino acid, they are amphoteric

Mock Test - 2 - Question 2

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Cationic addition polymerisation reaction initiated by an acid is maximum in

A.
CH₃CH₂CH=CH₂
B.
C.
CH₃CH=CH₂
D.
CH₂=CH₂

Detailed Solution for Mock Test - 2 - Question 2

Cationic polymerisation is decided by nucleophilicity of alkenes, which depends upon number of α-Hydrogen.

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Mock Test - 2 - Question 3

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Magnetic moments of Cr(Z = 24), Mn(Z = 25) and Fe(Z = 26) are x, y and z respectively. Hence,

A.
x = y = z
B.
x = z < y
C.
x < y < z
D.
x > y > z

Detailed Solution for Mock Test - 2 - Question 3

Magnetic moment is decided by number of unpaired electrons.

Cr [Ar]4s¹3d⁵   no. of unpaired electrons = 6
       Mn[Ar]4s²3d⁵   no. of unpaired electrons = 5
       Fe[Ar]4s²3d⁶   no. of unpaired electrons = 4

Mock Test - 2 - Question 4

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Silica is added to roasted copper ore during smelting in order to remove

A.
cuprous sulphide
B.
ferrous oxide
C.
ferrous sulphide
D.
cuprous oxide

Detailed Solution for Mock Test - 2 - Question 4

Silica is acidic flux, so, it is used to remove basic oxide i.e. FeO

Mock Test - 2 - Question 5

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The reaction
is fastest when X is

Detailed Solution for Mock Test - 2 - Question 5

It is an example of nucleophilic substitution on acid derivatives which is decided by leaving tendency i.e poor basic character.

Mock Test - 2 - Question 6

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16 g of an ideal gas SO_x occupies 5.6 L at STP. The value of x for this gas is

A.
1
B.
2
C.
3
D.
4

Detailed Solution for Mock Test - 2 - Question 6

1 mole of any gas occupies 22.4 L at STP so, molecular mass of

Hence, X is 2.

Mock Test - 2 - Question 7

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Which of the following pairs of structures is an example of diastereomers ?

Detailed Solution for Mock Test - 2 - Question 7

Diastereomers are non- mirror images, either optical isomers or geometrical, given componds are trans and c is respectively.

Mock Test - 2 - Question 8

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IUPAC name of the compound is

A.
2-carboxylic pentane-1, 5-dioic acid
B.
propane-1, 2, 3-tricarboxylic acid
C.
iso-butane-1, 2, 3-tricarboxylic acid
D.
butane-1, 2, 3-tricarboxylic acid

Detailed Solution for Mock Test - 2 - Question 8

Rules for chain terminating functional groups

Mock Test - 2 - Question 9

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When a certain conductivity cell was filled with 0.01 M solution of KCl, it had a resistance of 160 ohm at 25⁰C and when filled with 0.005 M NaOH, it had a resistance of 190 ohm. If specific resistance of KCl solution is 700 ohm cm, specific conductance (ohm—1 cm^—1) of NaOH solution is

A.
0.00180
B.
0.00170
C.
0.00130
D.
0.00120

Detailed Solution for Mock Test - 2 - Question 9

Mock Test - 2 - Question 10

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Ozonolysis products of an olefin are Olefin is

Detailed Solution for Mock Test - 2 - Question 10

Ozononlysis of olefins results in the formation of carbonyl compounds

Mock Test - 2 - Question 11

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Arrange the following compounds in decreasing order of basicity
I. ethylamine
II. 2-amino ethanol
III. 3-amino-1-propanol

A.
I > II > III
B.
III > I > II
C.
I > III > II
D.
I < II > III

Detailed Solution for Mock Test - 2 - Question 11

Basic Character depends upon ability of compounds to donate lone pairs, so order of basic character :

Mock Test - 2 - Question 12

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One gram of hydrogen and 112 g of nitrogen are enclosed in two separate containers each of volume 5 L at 27⁰C. If the pressure of hydrogen is 1 atm, the pressure of nitrogen would be

A.
12 atm
B.
4 atm
C.
8 atm
D.
16 atm

Detailed Solution for Mock Test - 2 - Question 12

According to ideal gas equation,

Mock Test - 2 - Question 13

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A buffer solution contains 100 mL of 0.01 M CH₃COOH and 200 mL of 0.02 M CH₂COONa. 700 mL of water is added to this solution . pH before and after dilution are (pK_a = 4.74)

A.
5.04, 5.04
B.
5.04, 0.504
C.
5.34, 0.534
D.
5.34, 5.34

Detailed Solution for Mock Test - 2 - Question 13

Dilution has no effect on pH of buffer solution hence pH (after dilution) = 5.34

Mock Test - 2 - Question 14

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Following is the concentration cell in which electrode is reversible with respect to anion
Pt(Cl₂)|Cl^—(C₁)||Cl^—(C₂)|Pt(Cl₂)
1 bar 1 bar
The cell reaction is spontaneous, if

A.
C₁ > C₂
B.
C₁ < C₂
C.
C₁ = C₂
D.
C₁ = 0

Detailed Solution for Mock Test - 2 - Question 14

For conc. cell of halogen,

Mock Test - 2 - Question 15

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Consider the following reactions
(I)
A and B are respectively

Detailed Solution for Mock Test - 2 - Question 15

B is formed by carbocationic rearrangement

Mock Test - 2 - Question 16

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he correct name for the complex ion [Co(en)₂Cl(ONO)]⁺ is

A.
cobaltdiethylenediaminechloronitrate
B.
chlorodiethyldiaminenitritocobalt (III)
C.
chlorobis(ethylenediamine)nitritocobalt (III)
D.
chlorobis(ethylenediamine)nitritocobalt (I)

Detailed Solution for Mock Test - 2 - Question 16

following IUPAC rules

Mock Test - 2 - Question 17

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A laboratory reagent imparts green colour to the flame. On heating with solid K₂Cr₂O₇ and conc. H₂SO₄, it evolves an orange red gas. Identify the reagent.

A.
CaCl₂
B.
BaCl₂
C.
CuCl₂
D.
None of these

Detailed Solution for Mock Test - 2 - Question 17

Compond must have free Cl^- ions in solution and ability to give green flame colour

Mock Test - 2 - Question 18

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van’t Hoff factors are x, y and z in case of association, ionisation and no change, respectively. Their increasing order is

A.
x < y < z
B.
x = y = z
C.
y < x < z
D.
x < z < y

Detailed Solution for Mock Test - 2 - Question 18

Van’t Hoff factor represnt number of particles. In ionsation, it increases while in association it decreases so, y > z > x

Mock Test - 2 - Question 19

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Which of the following does not illustrate the anomalous properties of Li ?

A.
The melting point and boiling point of Li are comparatively high
B.
Li forms a nitride Li₃N unlike group I metals
C.
Li is much softer than the other I group metals
D.
LiNO₃ on decomposition produces its oxide unlike group I metals

Detailed Solution for Mock Test - 2 - Question 19

Li is a hard metal due to its small size

Mock Test - 2 - Question 20

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If for a reaction A→B,ΔH = —10 kJ mol^—1 and E_a = 50 kJ mol^—1, the energy of activation for reaction B→A will be

A.
60 kJ mol^—1
B.
50 kJ mol^—1
C.
—50 kJ mol^—1
D.
40 kJ mol^—1

Mock Test - 2 - Question 21

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NaAlH4 reduces an ester into HCHO and (CH₃)₂CHOH. Thus, ester is

A.
HCOOCH(CH₃)₂
B.
(CH₃)₂CHCOOCH₃
C.
HCOOCH₂CH₂CH₃
D.
CH₃CH₂COOCH₃

Detailed Solution for Mock Test - 2 - Question 21

Mock Test - 2 - Question 22

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Match the following lists

The correct answer is

A.
A
B.
B
C.
C
D.
D

Detailed Solution for Mock Test - 2 - Question 22

These are the facts

Mock Test - 2 - Question 23

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What is the repeating unit in nucleic acids ?

A.
Monosaccharides
B.
Amino acids
C.
Nucleotides
D.
Nucleosides

Detailed Solution for Mock Test - 2 - Question 23

Nucleotides are made up of nucleoside and phosphate group

Mock Test - 2 - Question 24

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Reduction of a metal oxide by excess carbon at high temperature is a method for the commercial preparation of some metals. This method can be successfully applied in the case of

A.
BeO and Al₂O₃
B.
ZnO and Fe₂O₃
C.
CaO and Cr₂O₃
D.
BaO and U₃O₈

Detailed Solution for Mock Test - 2 - Question 24

Factual

Mock Test - 2 - Question 25

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Elevation in boiling point of an aqueous urea solution is 0.52⁰(k_b = 0.52⁰ mol^—1 kg). Hence, mole fraction of urea in this solution is

A.
0.982
B.
0.0567
C.
0.943
D.
0.018

Detailed Solution for Mock Test - 2 - Question 25

Mock Test - 2 - Question 26

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A 100 mL sample is removed from water solution saturated with CaSO₄ at 25⁰C. The water is completely evaporated from the sample and a deposit of 0.24 g CaSO₄ is obtained. The K_spof CaSO₄ at 25⁰C is

A.
3.114 x 10^—4
B.
1.76 x 10^—3
C.
2.32 x 10^—4
D.
3.24 x 10^—6

Detailed Solution for Mock Test - 2 - Question 26

Mock Test - 2 - Question 27

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For the reaction,2Fe³⁺ + Fe →3Fe²⁺, E⁰ = 1.21 V, hence

A.
the reaction occurs even in the absence of a second half cell or a current
B.
in a complete cell, Fe is anode but Pt is the cathode
C.
Fe can’t be used as cathode, because it would directly react with Fe³⁺, thus short-circulating the cell
D.
All of the above are correct

Detailed Solution for Mock Test - 2 - Question 27

As E⁰ is positive , reaction is spontaneous

Mock Test - 2 - Question 28

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In a transition series, as the atomic number increases, paramagnetism

A.
increases gradually
B.
decreases gradually
C.
first increases to a maximum and then decreases
D.
first decreases to a minimum and then increases

Detailed Solution for Mock Test - 2 - Question 28

Upto middle of the series number of unpaired electrons increases, then decreases

Mock Test - 2 - Question 29

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When FeS2 is burnt in air, it converts to Fe₂O₃. The change in percentage by weight of iron in the process is (Fe = 56)

A.
12% increase
B.
23% increase
C.
13% increase
D.
no change

Detailed Solution for Mock Test - 2 - Question 29

Mock Test - 2 - Question 30

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Which of the following pairs of liquid form an emulsion ?

A.
H₂O and C₂H₅OH
B.
C₂H₅OH and C₂H₅OC₂H₅
C.
Water and coconut oil
D.
Coconut oil and NaOH

Detailed Solution for Mock Test - 2 - Question 30

Emulsion is colloidal of two immiscible liquids

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