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Home » Medical Papers » UHS MDCAT » Aptitude Test - 31
1.The number of molecules in 22.4 dm3 of H2 gas at 0 °C and 1 atm are
A. 60.2 x 1023
B. 6.02 x 1022
C. 6.02 x 1025
D. 60.2 x 1023
2.Correct order of boiling points of the given liquid is
A. H2O > HF > HCl > NH3
B. HF > H2O > HCl > NH3
C. H2O > HF > NH3 > HCl
D. H2O > HF > HCl > NH3
3.The relative energies of 4s, 4p and 3d orbitals are in the order
A. 3d < 4p <4s
B. 4s < 3d < 4p
C. 4p < 4s < 3d
D. 3d < 4p <4s
4.With increase in the value of Principal Quantum Number ‘n’, the shape of the s-orbitals remains the same although their sizes
A. Decrease
B. Increase
C. Remain the same
D. Decrease
5.The angle between unhybridized p-orbital and three sp2 hybrid orbitals of each carbon atom in ether is:
A. 120°
B. 90°
C. 109.5°
D. 120°
6.In ‘H-F’ bond electronegativity difference is ‘1.9’. What is the type of this bond?
A. Polar covalent bond
B. Non-polar covalent bond
C. Pi (π) bond
D. Polar covalent bond
7.‘ΔH’ will be given a negative sign in
A. Exothermic reactions
B. Decomposition reactions
C. Dissociation reaction
D. Exothermic reactions
8.Lattice energy of an ionic crystal is the enthalpy of
A. Combustion
B. Dissociation
C. Dissolution
D. Combustion
9.As number of solute particles increases, freezing point of the solution
A. Remains the same
B. Increases
C. First increases, then decreases
D. Remains the same
10.Boiling point constants help us to determine
A. Molar masses
B. Volumes
C. Pressures
D. Molar masses
11.In electrolysis of aqueous CuCl2, the metal deposited at cathode is
A. Sodium
B. Aluminium
C. Lead
D. Sodium
12.In MgCl2, the oxidation state of ‘Cl’ is
A. Zero
B. +2
C. -2
D. Zero
13.Formation of NH3 is reversible and exothermic process, what will happen on cooling?
A. More reactant will form
B. More N2 will be formed
C. More H2 will be formed
D. More reactant will form
14.A buffer solution is that which resists/minimizes the change in
A. pOH
B. pH
C. pKa
D. pOH
15.In some reactions, a product formed acts as a catalyst. The phenomenon is called
A. Negative Catalysis
B. Activation of Catalyst
C. Hetergeneous catalysis
D. Negative Catalysis
16.The reaction rate in forward direction decreases with the passage of time because
A. Concentration of reactants decrease
B. Concentration of product decreases
C. The order of reaction changes
D. Concentration of reactants decrease
17.Which one remains same along a period?
A. Atomic radius
B. Melting point
C. Number of shells (orbits)
D. Atomic radius
18.More the ionization energy of an element:
A. More the electropositivity
B. More the reducing power
C. Less the metallic character
D. More the electropositivity
19.Carbon has the unique ability to form long chains by bonding with other carbon atoms. This property of self-linking in carbon is known as:
A. Condensation
B. Polymerization
C. Cyclization
D. Condensation
20.Oxidation state of ‘Mn’ in KMnO4, K2MnO4, MnO2 and MnSO4 is in the order:
A. +7, +6, +2, +4
B. +6, +7, +2, +4
C. +7, +6, +4, +2
D. +7, +6, +2, +4
21.Which pair of transition elements shows abnormal electronic configuration?
A. Sc and Zn
B. Cu and Sc
C. Zn and Cu
D. Sc and Zn
22.The acid rain water has pH:
A. Below 5
B. 7
C. Between 5 and 7
D. Below 5
23.In Contact Process for manufacturing sulphuric acid, Sulphur trioxide (SO3) is not absorbed in water because
A. The reaction does not go to completion
B. The reaction is highly exothermic
C. The reaction is quite slow
D. The reaction does not go to completion
24.In modern Haber Process Plants, the temperature maintained during the process is
A. 670 – 770 K (400 °C – 500 °C)
B. 270 – 370 K (0 °C – 100 °C)
C. 370 – 470 K (100 °C – 200 °C)
D. 670 – 770 K (400 °C – 500 °C)
25.In the Haber process for manufacturing of ammonia, Nitrogen is taken from
A. Proteins occurring in living bodies
B. Ammonium salts obtained industrially
C. Air
D. Proteins occurring in living bodies
26.Ethene on polymerization, gives the product polyethene. This reaction may be called as
A. Addition
B. Condensation
C. Substitution
D. Addition
27.In the following, which one is free radical?
A. Cl―
B. Cl+
C. Cl2
D. Cl―
28.In substitution reactions, dihaloalkane or secondary halogenoalkane give / show:
A. SN1 Mechanism
B. SN2 Mechanism
C. Both E1 and E2
D. SN1 Mechanism
29.The dehydration of ethyl alcohol with concentrated H2SO4 at 140°C gives:
A. Ethene
B. Diethyl ether
C. Alcohol
D. Ethene
30.Ethanol can be converted in to ethanoic acid by:
A. Oxidation
B. Fermentation
C. Hydration
D. Oxidation
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