| Post Name | Chemist - Kerala State Co-operative Marketing Federation Ltd |
|---|---|
| Question Paper Code | 043/2022 |
| Category Code | 305/2020 |
| Date of Test | 24 April 2022 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
Which among the following formation is not an example of Covalent bond?
Answer
A. LiF
2
The wave length of a spectral line for an electronic transition is inversely related to :
Answer
C. The difference in the energy levels involved in the transition
3
It quickens the sedimentations of solid particles and improves the clarity of water,
which of the statements given above is/are corrected
Answer
D. 1, 2 and 3
043/2022 4 A
4
Increasing order of electronegativity is :
Answer
Question Cancelled
5
Examples of super octet molecule is :
Answer
D. All of these
6
When P4 O10 is dissolved in water, the acid formed finally is :
Answer
B. H3 PO4
7
XeF2 reacts with PF5 to give :
Answer
B. [XeF]+ [PF6 ]−
8
The Van der Waals equation (P + a/V²)(V − b) = RT, where P is pressure, V is specific volume, T is temperature and R is the gas constant. The SI unit of a is:
Answer
Question Cancelled
9
Which of the following can not exist on the basis of Molecular orbital theory?
+ +
Answer
D. He2
10
Cesium chloride on heating to 760K changes into :
Answer
A. NaCl structure
11
Effective Atomic Number (EAN) of Fe in Fe(CO)4 is :
Answer
B. 35
12
Hybridization of Fe in K3[Fe(CN6)] and K4[Fe(CN6)] :
Answer
C. d2sp3 and d2sp3
13
Which of the following metal has lowest melting point?
Answer
C. Tin
14
The element with maximum cosmic abundance :
Answer
A. Hydrogen
15
Among the following mixtures, dipole-dipole as the major interaction, is present in :
Answer
B. Acetonitrile and acetone
16
The value of n in the molecular formula Ben Al 2Si 6 O18 is :
Answer
A. 3
17
What is the role of ultra violet radiation in water purification system?
1. ‘It inactivates / kill the harmful microorganisms in water
2. It removes all the undesirable odours from the water
3. It quickens the sedimentations of solid particles and improves the clarity of water,
which of the statements given above is/are corrected
Answer
A. lonly
18
The pH of water at 250 is 7, when it is heated to 100ºC, the pH of water :
Answer
Question Cancelled
19
Which of the following copper alloys is used for the manufacture of springs and suspension of
springs and suspension filaments in electrical instruments?
Answer
D. Phosphor bronze
20
Which of the following is/are the hazardous pollutant(s) present in automobiles exhaust
gases?
1. N,
2. CO
3. CH,
4. Oxides of nitrogen
Answer
C. 2and4
21
Which of the following is correctly matched?
Answer
B. Lead – Galena
22
In cold water, aquatic animals survive even when water to the top layer of the lake freezes
into ice because :
Answer
D. Water has structure density of 4ºC so underneath the top layer of there is layer of
water
23
Ferrocene cannot undergo which of the following reaction?
Answer
B. Diels-Alder reaction
24
According to wade’s Rule,
Answer
A. closo structure
25
Which of these can be used as moth repellent?
Answer
C. Hexachloroethane
26
What is the major organic product obtained from the following reaction?
H3O+
HgSO4
Answer
B. OH O
O
27
Which of the following statement is incorrect about nucleophiles?
Answer
C. A nucleophile is electron-deficient species
28
A layer of reddish-brown precipitate which is formed on the iron knife, when an iron knife is
dipped in an aqueous solution of copper sulphate is of which compound or element?
Answer
B. Copper
29
Who proposed arrow pushing method of showing progression of elections?
Answer
Question Cancelled
30
What is obtained by thermolysis of azides?
Answer
C. Nitrene
31
Results from long-term exposure to lower doses of a chemical is known as
Answer
B. Chronic toxicity
32
LD50 in a toxicity test stands for
Answer
A. a dose that will kill 50% of an exposed population
33
Which of the following is not soluble in NaHCO3?
Answer
C. o-Nitrophenol
34
The product formed by the reaction of an aldehyde with a primary amine is :
Answer
D. Schiff’s base
35
Which of the following is most reactive towards SN1 reaction?
Answer
A. C6 H5C(CH3 )C6 H5 Br
36
A dihalogen derivative ‘X’ of a hydrocarbon with three carbon atoms react with ale. KOH and
produces hydrocarbon which forms red ppt. with ammoniacal Cu2Cl2. ‘X’ gives an aldehyde on
reaction with aq. KOH. The compound ‘X’ is
Answer
D. 1, 1-Dichloropropane
37
The synthesis of alkyl fluoride is best accomplished by :
Answer
B. Swartz reaction
38
Which of the following compounds will give racemic mixture on nucleophilic substitution by
OH” ion?
1 -Bromoethane, 1-Bromopropane, 1-Bromobutane, Bromobenzene
Answer
Question Cancelled
39
Which of the following has ester linkages?
Answer
C. Terylene
40
Zeigler-Natta catalyst is used in making :
Answer
B. High density polyethylene
41
What will be the fraction of molecules having energy equal to or greater than activation
energy, Ea?
Answer
D. e − Ea/Rt
42
What is the geometry of pentacarbonyl iron
Answer
C. Trigonal bipyramidal
43
Which of the following will give effective reduction of 3-hexyne to trans-3-hexene?
Answer
B. Na/liq. NH3
44
An organic compound (MF; C8H10O) exhibited the following 1H NMR special data:
62.5 (3H, s), 3.8 (314, s), 6.8 (2H, d, J 8 Hz), 7.2 (2H, d, J 8 Hz) ppm. What will be the
compound among the choices?
Answer
Question Cancelled
45
Which Biomolecules simply refers as “Staff of life” in the given macromolecules?
Answer
B. Carbohydrate
46
Who discovered the mass spectrometer?
Answer
D. J.J. Thomson
47
Which of the following is a product formed in Claisen condensation?
Answer
C. β -keto ester
48
Which of the following will form alkyl bromide on reaction with Br2 ?
Answer
C. Silver salt of fatty acids
49
Reaction of chlorobenzene with NaNH 2 / NH3 forms :
Answer
D. Benzyne
50
Bischler-Napieralski synthesis is used to prepare :
Answer
C. Isoquinoline
51
Which of the following is a hetrocyclic compound not having 2 nitrogen atoms in the same
ring?
Answer
A. Isoxazole
52
Chlorination of toluene with excess Cl 2 in presence of heat followed by hydrolysis gives :
Answer
B. Benzoic acid
53
Alkyl halide may be converted to alkane by reduction with :
Answer
A. Zn/Cu/HCl
54
LiAlH 4 converts acetic acid into :
Answer
C. Ethanol
55
A pure organic compound dissolved in dry benzene evolves hydrogen on reaction with
sodium. It may be :
Answer
B. Alcohol
56
To obtain 1-Propanol from propene, the reagent of choice is :
Answer
D. B2 H 6 /Alk.H2 O2
57
Ethanol may be distinguished from methanol by :
Answer
C. Iodoform test
58
Oxymercuration of alkenes may be used to prepare :
Answer
D. Alcohols
59
The reaction, which is used to convert phenol to salicylic acid is :
Answer
A. Kolbe-Schmidt reaction
60
Reformatsky reaction is the reaction between a carbonyl compound, zinc and :
Answer
C. α -Halo ester
61
The reagent which is capable of reacting both with aldehyde as well as ketone :
Answer
B. Grignard reagent
62
Benzoin condensation takes place between :
Answer
D. Aromatic aldehyde only
63
Which of the following method is specific for the preparation of aromatic aldehydes?
Answer
B. Etard’s reaction
64
Perbenzoic acid reacts with alkenes to form :
Answer
A. Epoxides
65
Hell Volhard Zelenski reaction is used to prepare :
Answer
D. Side chain halogen acids
66
Consider two identical containers, one with 1 mole of hydrogen and the other with 1 mole of
helium. If the RMS velocity of these two gases are the same, then the ratio of the
temperature, i.e., TH2 /THe = ––––––––––?
1 2
Answer
A. =
67
Four 1 litre flasks are separately filled with the gases O2 , F2 ,CH 4 and CO2 , under the same
conditions of temperature and pressure. The ratio of their number of moles will be :
Answer
C. 1 : 1 : 1 : 1
68
Most probable velocity, average velocity and RMS velocity are related as :
Answer
C. 1 : 1.128 : 1.224
69
The rate of diffusion of SO3 , CO2 , PCl 3 and SO2 are in the following order :
Answer
D. CO2 > SO2 > SO3 > PCl 3
70
The ratio of the total volume of bcc to simple cubic structure is :
Answer
A. 8:3 3
71
A gas at temperature 250 K and pressure 15 atm, has a molar volume 12% smaller than that
calculated from ideal gas equation, then compressibility factor under these condition is :
Answer
D. 0.88
72
Calculate the freezing point of an aqueous solution of urea, it is boils at 373.1 K
K f = 1.8 K Kg/mol, K b = 0.5 K Kg/mol :
Answer
C. 272.64 K
73
Assuming ideal behaviour, calculate the mass of a non-volatile liquid, whose molecular
mass = 120, which would be dissolved in 200 g of octane, by 2% lowering of vapour pressure :
Answer
B. 4.21 gm
74
Ksp of a salt, with general formula MX 2 , in water is 4 × 10–12. Calculate the concentration of
M 2 + ions in the saturated aqueous solution of the salt :
Answer
D. 1 × 10–4 mol/L
75
Which of the following change the value of K?
Answer
Question Cancelled
76
A system with zero-degree of freedom is known as :
Answer
C. Invarient
77
A catalyst will increase the rate of a chemical reaction by :
Answer
D. lowering the activation energy
78
The units of erg, Joule and Calorie are interconvertible; which of the following is incorrect?
Answer
D. 1 erg = 4.184 Cal
79
One mole of an ideal gas at 300 K is expanded isothermally from 1 litre to 10 litre. ΔE for the process is ________. (R = 2 Cal K⁻¹ mol⁻¹)
Answer
D. 0 cal
80
The equation dp/dT = ΔH/[T(V₂ − V₁)] is called:
Answer
B. Clapeyron equation
81
A process is in the equilibrium state when :
Answer
A. ΔG = 0
82
The efficiency of a heat engine operating between 400 K and 300 K is :
Answer
D. 0.25
83
In a process ΔH = 100 KJ and ΔS = 100 J/K at 400 K. The value of ΔG will be :
Answer
C. 60 KJ
84
The half life for a first order reaction is 2768 years. If the concentration after 11072 years is
0.0216 M, what was the initial concentration?
Answer
B. 0.345 M
85
For a certain reaction, a plot of ln[
Answer
B. 1
86
For a reaction A → B , the activation energy is Ea = 125 KJ/mol and the heat of reaction,
ΔH = 50 KJ/mol. What is the Ea for the reverse reaction in KJ/mol?
Answer
A. 75 KJ/mol
87
The heat of adsorption in physical adsorption lies in the range :
Answer
A. 1 – 10 KJ/mol
88
0.5 Normal solution of a salt placed between two platinum electrodes, 20 cm apart and of
area of cross-section 4.0 sq.cm has a resistance of 25 ohms. Calculate the equivalent
conductance of the solution :
Answer
C. 400 ohm–1 cm2 eqvt–1
89
30% of 2nd order reaction is completed in 15 minutes. Calculate the time for 60% completion :
Answer
B. 52.5 minutes
90
A certain current liberated 1.008 g of hydrogen in 2 hours. How many grams of copper can be deposited by the same current for the same time in CuSO₄ solution (atomic mass of Cu = 63.5)?
Answer
A. 31.75 g
91
The specific conductance of a 0.01 M solution of KCl is 1.4 × 10–3 ohm–1 cm–1 at 298 K. Its
molar conductance is :
Answer
D. 140 ohm–1 cm2 mol–1
92
The equivalent conductance at 18ºC of a normal solution of KCl is 98.2 and for infinite
dilution at the same temperature is 131. Calculate the degree of dissociation of KCl at this
dilution :
Answer
D. 0.75
A 13 043/2022
93
pH of an aqueous solution of weak acid and strong base is given by the relation:
Answer
A. pH = 7 + (1/2)pKa + (1/2)log C
94
The heat of neutralisation of all strong acid and strong base is:
Answer
B. nearly the same
95
Which among the following is not microwave active?
Answer
B. H2
96
The NMR active molecule is :
12 13
Answer
B. 6C
16 4
97
The magnetic moment of a molecule is 1.732 magnetons. The number of unpaired
electrons is :
Answer
B. 1
98
n → σ ∗ transition occurs in :
Answer
C. halogen compounds
99
Specific selection rule for rotational spectrum is :
Answer
B. Δ J = ±1
100
The formula used for the determination of relative viscosity by Ostwald’s method is :
y1 d1 t1 y1 d1 t2
Answer
A. =
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