Engineering Entrance Sample Papers

JEE Mains Chemistry Online Mock Test

chemistry in the JEE Mains

JEE Free Chemistry Online Mock Test

Question 1
A gas of volume 100 cc is kept in a vessel at pressure 104 Pa maintained at temperature 24oC. If now the pressure is increased to 105 Pa, keeping the temperature constant, then the volume of the gas becomes
A
10 cc
B
1 cc
C
1000 cc
D
100 cc
Question 2
The mass of copper deposited from a solution of CuSO4 by passage of 5 A current for 965 second is (Mol. wt. of Copper = 63.5)
A
4825 g
B
1.5875 g
C
96500 g
D
15.875 g
Question 3
The product obtained by dry distillation of calcium formate on reacting with ammonia yields
A
Urotropine
B
Acetaldehyde ammonia
C
Acetamide
D
Formamide
Question 4
The most stable conformation of n-butane is
A
Staggered
B
Skew boat
C
Gauche
D
Eclipsed
Question 5

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The atomic radii from Cr to Cu is almost identical because of
A
All the above
B
Increasing nuclear charge from Cr to Cu
C
Repulsion among increased electrons
D
Increased screening effect to nullify increased nuclear charge
Question 6
The oxidation number of cobalt in K[Co(CO)4] is
A
+1
B
–3
C
–1
D
+3
Question 7
The ionic radii of Rb+ and Iare 1.46 Å and 2.16Å. the most probable type of structure exhibited by it is
A
CsCl type
B
NaCl type
C
ZnS type
D
CaCl type
Question 8
The following reaction belongs to
A
Substitution reaction
B
Elimination reaction
C
Displacement reaction
D
Free radical reaction
Question 9
How many isomers are possible in [Co(en)2Cl2]
A
2
B
1
C
4
D
6
Question 10
Melting points are normally the highest for

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A
Secondary amides
B
Primary amides
C
Amines
D
Tertiary amides
Question 11
On addition of one ml of 10% NaCl solution to 10 ml gold sol in the presence of 0.25 gm of starch. The coagulation is just prevented, starch has gold number
A
0.25
B
None
C
2.5
D
0.025
Question 12
Which one in the following contains ionic as well as covalent bond

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A
HCl
B
KCl
C
CCl
D
KCN
Question 13
1 L of N2 combines with 3 L of H2 to form 2L of NH3 under the same conditions. This illustrates the
A
Law of reciprocal proportions
B
Law of multiple proportions
C
Gay-Lussac’s law of gaseous volumes
D
Law of constant composition
Question 14
The coordination and oxidation number of X in the compound [X(SO4)(NH3)5] Cl will be
A
6 and 4
B
10 and 3
C
6 and 3
D
2 and 6
Question 15
Molisch's test is done for the detection of
A
Alkyl halide
B
Alkaloid
C
Fat
D
Carbohydrate
Question 16
Crystals of covalent compounds always have
A
Molecules as structural units
B
Ions held together by electrostatic forces
C
High melting points
D
Atoms as their structural units
Question 17
The process used for the removal hardness of water is
A
Calgon
B
Serpeck
C
Baeyer
D
Hoope
Question 18
One mole of NaCl (s) on melting absorbed 30.5 kJ of heat and its entropy is increased by 28.8 JK–1. The melting point of NaCl is

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A
28800 K
B
30.5 K
C
28.8 K
D
1059 K
Question 19

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Which of the following exhibits optical isomerism
A
Butene-1
B
Butene-2
C
Butanol-1
D
Butanol-2
Question 20
Temperature of maximum density in H2O and D2O respectively are
A
273.15 K, 277.15 K
B
284.75 K, 277.15 K
C
277.15 K, 284.75 K
D
277.15 K, 285.75 K
Question 21
The boiling point of 0.1 molal aqueous solution of urea is 100.18o C at 1 atm. The molal elevation constant of water is
A
18
B
0.18
C
1.8
D
18.6
Question 22
Atomic hydrogen reacts with oxygen to give
A
Almost pure water
B
A mixture of water and hydrogen peroxide
C
Almost pure hydrogen peroxide
D
None of these
Question 23
If a electron is present in place of anion in a crystal lattice, then it is called
A
Schottky defect
B
Frenkel defect
C
Interstitial defects
D
F – centre
Question 24
The freezing point of a solution containing 4.8 g of a compound in 60 g of benzene is 4.48. What is the molar mass of the compound (Kf = 5.1 km–1), (freezing point of  benzene = 5.5o
A
300
B
400
C
200
D
100
Question 25
0.2 gm of fine animal charcoal is mixed with half litre of acetic acid (–SM) solution and shaken for 30 minutes

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A
Concentration increases
B
The concentration of the solution decreases
C
None of these
D
Concentration remains same
Question 26
Which metal is found in free state
A
Aluminium
B
Iron
C
Gold
D
Sodium
Question 27
Which of the following is optically active
A
4-methylheptane
B
3-methylheptane
C
2-methylheptane
D
Butane
Question 28
Values of the four quantum numbers for the last electron in the atom are n = 4, l = 1, m = + 1 and s = –1/2. Atomic number of the atom will be
A
36
B
22
C
33
D
32
Question 29
One mole of potassium dichromate completely oxidises the following number of moles of ferrous sulphate in acidic medium

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A
3
B
1
C
6
D
5
Question 30
Buna-s rubber is which of the following of 1-3-butadiene and styrene
A
Copolymer
B
Polymers
C
Addition
D
Condensation polymer
Question 31
If the pressure and absolute temperature of 2 litres of CO2 are doubled, the volume of CO2 would become
A
2 litres
B
4 litres
C
7 litres
D
5 litres
Question 32
What weight of hydrated oxalic acid should be added for complete neutralisation of 100 ml of 0.2 N – NaOH solution?
A
1.08 g
B
1.26 g
C
0.90 g
D
0.45 g
Question 33
The time of completion of 90% of a first order reaction is approximately
A
4.4 times that of half life
B
3.3 times that of half life
C
1.1 times that of half life
D
2.2 times that of half life
Question 34
The minimum energy necessary to permit a reaction is

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A
Internal energy
B
Threshold energy
C
Free energy
D
Activation energy
Question 35
The number of equivalents of Na2S2O3 required for the volumetric estimation of one equivalent of Cu2+ is
A
2
B
3/2
C
1
D
3
Question 36
The correct order of second ionization potential of carbon, nitrogen, oxygen and fluorine is
A
O > N > F > C
B
O > F > N > C
C
F > O > N > C
D
C > N > O > F
Question 37
Phenyl isocyanides are prepared from which of the following reactions

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A
Wurtz reaction
B
Reimer-Tiemann reaction
C
Carbylamine reaction
D
Rosenmund's reaction
Question 38
Preparation of alkyl halides in laboratory is least preferred by
A
Halide exchange
B
Addition of hydrogen halides to alkenes
C
Treatment of alcohols
D
Direct halogenation of alkanes
Question 39
Which one of the following is not a property of hydrophilic solutions?

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A
Viscosity and surface tension are about the same as for water
B
Coagulation is reversible
C
The charge of the particle depends on the values of the medium; it may be positive, negative or even zero
D
High concentrations of dispersed phase can be easily attained
Question 40
Which of the following is a protein
A
ATP
B
Glutamin
C
Pepsin
D
Adrenaline
There are 40 questions to complete.
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