MDCAT Chemistry Online Test With Answers

MDCAT Chemistry Online Test

Sr. # Questions Answers Choice
1 Hydrogen bonding is not present in which of following compound? Ammonia Ethanol Ether Water
2 The polarizabilities of elements mostly increase down the group due to the reason that the atomic numbers increase number of protons increase number of shells increase along with increase of shielding effect the behaviour of the elements remain the same
3 Dipole-induced dipole forces are also called dipole-dipole forces ion-dipole forces Debye forces London-dispersion forces
4 The boiling point of higher alkanes are greater than those of lower alkanes due to reason that higher alkanes have greater number of atoms the polarizabilities of higher alkanes are greater higher alkanes have greater hydrogen bonding higher alkanes have zig-zag structures
5 Saturated hydrocarbons having carbon atoms more than 20 in a molecule are solids due to higher densities higher molar masses the chain, are more zig-zag all are correct
6 The boiling points of the halogens increases down the group decreases down the group remains constant can not be predicted
7 Polarizability is responsible for intermolecular forces and it increases down the group decreases down the group almost remains the same increased along a period
8 Dipole-dipole interaction are present in the atoms of the He gas molecules of CCl4 molecules of solid iodine molecules of :NH3
9 Strong dipole-dipole forces among the liquid molecules are responsible for very high heat of vaporization very low heat of vaporization cannot be predicted negligible forces are these
10 The forces which are present between the ions and the water molecules are known as dipole-induced dipole forces dipole-dipole forces ion-dipole forces London dispersion forces
11 Liquid hydrocarbon is methane propane ethane hexane
12 The nature of crystals formed due to London forces of interaction are molecular metallic ionic covalent
13 The nature of the attractive force in acetone and chloroform are dipole-induced dipole forces dipole-dipole forces ion-dipole forces instantaneous forces
14 The weakest intermolecular forces present in a liquid may be Dipole-induced dipole forces dipole-dipole forces instantaneous forces electrostatic forces between ions in a ionic solid
15 Density of a gas increases by increasing value of R decreasing value of R increasing T decreasing T
16 At higher temperature what is true for gases pressure is decreased volume is decreased number of moles are decreased KE is increased
17 The volume of a real gas is constant increases with T decrease becomes zero at absolute zero never becomes zero
18 If volume of an ideal gas at 0C° 536cm3, what is volume at 1°C 373 cm3 646 cm3 Becomes 0cm3 746 cm3
19 Under which condition CO has the maximum molar volume high T and P Low T and High p high T and low P Low T and low P
20 At higher temperature isotherm of Boyle's law moves away from both axis, is due to increase in: pressure No. of moles Volume All
21 The number of molecules in 22.4 dm3 of gas at 0°C and 1 atm are 6.02×10(23) 6.02× 10(25) 6.02×10(22) 6.02×10(21)
22 If volume of an ideal gas at 0°C 536cm3, what is volume at 1°C 373 cm3 646 cm3 Becomes 0cm3 746 cm3
23 Under which condition CO has the maximum molar volume. high T and P Low T and High p high T and low pressure Low T and low P
24 At higher temperature isotherm of Boyle's law moves away from both axis, is due to increase in pressure No. of moles Volume all of these
25 The relationship between density and molar mass of a gas is Directly proportional <sup>Inversly proportional</sup> Straight line Stoichiometric
26 Charles's law is only obeyed at which temperature scale Celsius Kelvin Fahrenheit both A&amp;B
27 The actual volume of gas molecules is considered negligible at following pressures 2atm 4atm 6 atm 8 atm
28 According to the general gas equation, density of an ideal gas depends upon Pressure Temperature Molar mass of the gas All of the above
29 At absolute zero the molecules of hydrogen gas will have Only translatioral motion Only vibrational motion Only rotational motion All the motion are ceased
30 Which of the statement is applicable for both ideal and real gases molecules? Have no forces of attraction Collisions between the molecules is elastic Molecules are in random movement The actual volume of gas is negligible as compared to the volume of gas
31 Which of the following is the correct equation to calculate relative molecular mass of a gas M=mPRTV M=mPR/VT M=PV/mRT M=mRT/PV
32 Gas is enclosed in a container of 20cm3 with the moving piston. According to kinetic theory of gases, what is the effect on freely moving molecules of the gas if temperature is increased from 20°C to 100C. Colliding capability of molecule will become lower Pressure will become one half Temperature has no effect on freely moving molecules Volume will be increased
33 The mono atomic gases are Halogens Noble gases 6h group elements Nitrogen and oxygen
34 The volume of gas depends upon the------- moleules Size of Space between Molecular weight both a and b
35 The pressure exerted by gas molecules is due to their collisions densities masses kinetic energy
36 The temperature of a gas is directly proportional to its average translational kinetic energy enthalpy internal energy hydration energy
37 The motion imparted to the gas molecules by gravity is very small very large negligible appreciable
38 Theoretically, the temperature at which volume of gas become equal to zero is called Boiling point of water Zero absolute Zero Kelvin both B and C
39 .The number of moles in 2.24 dm3 of H2 gas at STP is: 1 0.1 10 0.01
40 One dm3 of H2 and O2: has different masses but no. of particles are same H2 has greater different <div><br></div><div>O2 has greater</div>
41 The pressure of gas at constant temperature in a container of 2dm3 is 10 atm what will be its final pressure if it is connected with 10 dm3 container 2 atm 1.6 atm 5 atm I atm
42 Which one of the following statements is wrong for gases? gases do not have a definite shape and volume volume of the gas is equal to volume of container confining the gas confirmed gas exerts uniform pressure on the walls of its container in which it is enclosed <div>mass of gas cannot be determined by weighing a container in which it is enclosed</div>
43 The root mean square velocity of a gas is doubled when the temperature is reduced to half. reduced to one-fourth increased four times inereased two times
44 At constant volume, for a fixed number of moles of a gas the pressure of the gas increases with size of temperature due to increase in average molecular speed increase in number of moles increase in molecular attraction decrease in the distance between the molecules
45 The molecular speed Crms of gas is Independent of temperature Proportional to the absolute temperature Proportional to the square root of absolute temperature Proportional to the square of absolute temperature
46 Which is not true in case of an ideal gas? It cannot be converted into a liquid There is no interaction between the molecules All molecules of the gas move with same speed At a given temperature P'V is proportional to the amount of the gas
47 According to kinetic theory of gases kinetic energy depends on Temperature Collision Pressure Atomic number
48 Acording to the kinetic theory of gases The pressure exerted by a gas is proportional to mean square velocity of the molecules The pressure exerted by the gas is proportional to the root mean square velocity of the molecules The root mean square velocity is inversely proportional to the temperature The mean translational KE of the molecule is directly proportional to the absolute temperature
49 An ideal gas expands according to PV=constant. On expansion, the temperature of gas will rise will drop cannot be determined because the exteral pressure is not known will remain same
50 The density of neon will be highest at STP 0°C, 2 atm 273°C, 1 atm 273°C, 2 atm
51 If a gas expands at constant temperature The pressure decreases The Kinetic energy of the molecules remains the same The kinetic energy of the molecules decreases The number of molecules of the gas increase
52 What are the conditions under which the relation between volume (V) and number of moles (n) of gas is plotted? (Pressure; T-temperature) constant P and T constant P and V constant T and V constant n and v
53 An ideal gas, obeying Kinetic theory of gases cannot be liquified, because its critical temperature is above 0°C its molecules are relatively small in size It solidifies before becoming a liquid Forces acting between its molecules are negligible
54 If temperature is 73K and volume is 146 cm3 then calculate the value of K=V/T 5 4 3 2
55 The volume of given mass of gas is directly proportional to absolute temperature when pressure is kept constant this is called Boyle's law Charles's law Graham's law Dalton's law
56 Which type of motion is exhibited by gases? Vibrational Transitional Rotational All of them
57 For an ideal gas, number of mole in terms of its pressure P, temperature T and gas constant is PT/R PRT PV/RT RT/P
58 Helium atom is two times heavier than a hydrogen molecule. At 298 K, the average kinetic energy of a helium atom is same as that of a hydrogen molecule half that of a hydrogen molecule two times that of a hydrogen molecule four times that of hydrogen molecule
59 If increase in temperature and volume of an ideal gas is two times, then the initial pressure P changes to 4P P 2P 3P
60 Burning of which one of the following waste is considered as useful industrial fuel or to produce electricity. Metals Crass Paper Plastic
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