MDCAT Chemistry Online Test With Answers

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MDCAT Chemistry Online Test

Sr. # Questions Answers Choice
1 Equal volume of all gases at same  temperature and pressure contain number of molecules: multiples  equal  different  in fractions
2 As gases can adopt the shape of the container. Therefore gases have: different shapes fixed shapes  no fixed shapes  definite shapes
3 The beaker contains slurry of ice and water, the three thermometers Fahrenheit, Kelvin and centigrade placed init. the thermometers are represented as A, B and C respectively, On which thermometer the lowest reading will be? B A C both A and B
4 Which equation among the following is applicable to an ideal gas equation? P = nRT P = MRT P = dPRT/M  V = dRT/M
5 Choose the correct equation among the following given by clauslus to understand to behaviour of molecules: PV =nRT C<sub>r.m.s </sub>=&nbsp;√3RT/M d = PM/RT PV = 1/3mnc<sup>-2</sup>
6 Liquefaction of gas can only be carried out if the: without caring for the value critical volume at critical stage the temperature is more than critical and pressure is 1000 atm the temperature is below the critical and pressure is very high&nbsp; temperature is above the critical temperature and pressure can have any value
7 The volume of a gas that is occupied by its one mole at S.T.P. is known as: atomic volume&nbsp; molar volume&nbsp; normal volume&nbsp; total volume
8 The respiration process taking place in animals depends upon a difference in: vapour pressure&nbsp; osmotic pressure&nbsp; partial pressure atmospheric pressure
9 An instrument which is used to measure the pressure of a gas is called: barometer photometer stalagmometer viscometer
10 A graph is plotted, P on x-axis and V on y-axis for a given mass at constant temperature, we shall get: a curve with different peaks&nbsp; a curve called isotherm&nbsp; straight line parallel to x-axis&nbsp; a straight line
11 choose the temperature among the following at which real gas obeys ideal gas laws when pressure range is appreciable: critical temperature&nbsp; boyle's &nbsp;temperature inversion temperature&nbsp; transition temperature
12 Critical temperature of argon's gas is low. the reason is that it contains four lone pairs it is mono atomic gas&nbsp; it has as smell signed its polarizability &nbsp;is low&nbsp;
13 The molecules of air don't settle down. This is due to: non-polar nature of gases different molar mass elastic collisions of gas molecules pressure of dust &nbsp;particles in air&nbsp;
14 Equal masses of methane and oxygen are mixed in an empty container at 25∘C. 1/3 8/9 1/9 16/17
15 This is known fact that the molar volumes of different gases at S.T.P. are  much larger than the molar volumes of liquids and solids&nbsp; little bit less than the molar volumes of solids&nbsp; about the same as the molar volumes of liquids&nbsp; little bit greeter than the molar volumes of liquids
16 The deviation of a gas from ideal behavior is maximum at: -10∘C and 5.0 atm -10∘C and 2.0 atm&nbsp; 100∘C and 2.0 atm 0∘C and 2.0 atm
17 choose the best example of diffusion of gases: vapour condensing on moist surface&nbsp; spreading of small from a scent bottle&nbsp; hot air rising above a candle&nbsp; bubbling in soda bottle&nbsp;
18 How should the conditions be changed to prevent the volume of a given gas from expanding when its mass increased? temperature and pressure both ara increased temperature and pressure both are lowered&nbsp; temperature is lowered and pressure is increased temperature is increased and pressure is descreased
19 The minimum temperature recorded by Kelvin scale is: 273K 373K Absolute scale is unable&nbsp; 0K to record this temperature
20 The number of molecules in one dm3 of water is close to: 6.02/22.4 x10<sup>23</sup> 12.04/22.4 x10<sup>23</sup> 18/22.4x 10<sup>23</sup> 55.6x6.02x10<sup>23</sup>
21 Which if the following will have the same number of molecules at S.T.P? 280cm<sup>3</sup> of CO<sub>2</sub> and 280cm<sup>3</sup> of N<sub>2</sub>O 11.2dm<sup>3</sup> of O<sub>2 </sub>and 32g of O<sub>2</sub> 44g of CO<sub>2 </sub>and 11.2dm<sup>3</sup> of CO 28g of N<sub>2 </sub>and&nbsp;5.6dm<sup>3</sup> of oxygen
22 Image a man is sitting in a room. The room is closed from all sides, no entry no exit of any gas. If the room expands suddenly then: he will be frightened&nbsp; he will feel cool&nbsp; his blood pressure will decrease he will feel warmth&nbsp;
23 If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of the gas will: reduced to 1/4 be double&nbsp; increases four times&nbsp; remains unchanged
24 According to Boyle's law at constant temperature, the product of pressure and volume of a given mass of gas is: a constant&nbsp; fraction whole number&nbsp; a multiple
25 Which of the following element will have strongest van der Waal force of attraction between its molecules? nitrogen&nbsp; hydrogen&nbsp; oxygen&nbsp; chlorine
26 Areal gas obeying Van der Waal's equation will resemble ideal gas ilf the: both a and b are large&nbsp; both a and b are small&nbsp; a is small and b is large a is large and b is small
27 Pressure remaining constant at which temperature the volume of a gas will become twince of what it is at 0∘C. 546<span style="color: rgb(0, 0, 0); font-family: 'Lucida Sans Unicode', 'Lucida Grande', sans-serif; font-size: 18px; line-height: 23.390625px;">∘C</span> 200<span style="color: rgb(0, 0, 0); font-family: 'Lucida Sans Unicode', 'Lucida Grande', sans-serif; font-size: 18px; line-height: 23.390625px;">∘C</span> 546<font color="#000000" face="Lucida Sans Unicode, Lucida Grande, sans-serif" size="4"><span style="line-height: 23.390625px;">K</span></font> 273K
28 Which forms metallic crystals Cu NaCI SO<sub>2</sub> NH<sub>4</sub>CI
29 Which is trigonal crystal CaSO<sub>4</sub>. 2H<sup>2</sup>O MgSO<sub>4</sub> NaNO<sub>3</sub> All
30 In Case of elements the polymorphism is called Isotopic form Allotropy Isomorphism Crystalline forms
31 The material possessing superconducting properties is Yb Ba<sub>2</sub> Cu<sub>2</sub> O<sub>8</sub> Hg Be<sub>2</sub> Ca<sub>2</sub> Cu<sub>2</sub> O<sub>8</sub> Y Ba<sub>2</sub> Cu<sub>3</sub> O<sub>7</sub> Y B<sub>2</sub> Cu<sub>3</sub> O<sub>7</sub>
32 In a cubic lattice a unit cell is shard equally by how many unit cells? 4 2 6 8
33 The surface formed by the breakage of a crystal is called _____ plane Crystal Unit Cleavage None
34 Coordination number of Zn and ZnS (Zinc blends) is 4 6 2 None of these
35 If the distance between Na+ and CI- ions in sodium chloride crystal is X pm,the length of the edge of the unit cell is 4X om X/4 pm X/2 pm 2X pm
36 Which of the following statements about amorphous solids is incorrect? They melt over a range of temperature They are anisotropic There is no orderly arrangement of particles They are rigid and icompressible
37 Glass is a Micro-crystalline solid Super-cooled liquid Gel Polymeric mixture
38 Among solids,the highet melting point is exhibited by Covalent solids Ionic solids Pseudo solids Molecular solids
39 The major binding force of diamond,silicon and quartz is Electostatic force Electical attraction Ceobalent bond force Non convalent bond force
40 Super conductors are derived from compounds of P-block elements Lanthanides Actinides Transition elements
41 Which of the following has isomorphous structure NaF S Sn N
42 Crystal lattice with alternate +ve and -ve ions has radius ratio of 0.524.Its coordination number is 4 3 6 12
43 In which of the following processes the liquids are made to boil at low temperature Vacuum distillation Destructive distillation Distillation Vacuum destructive distillation
44 Water may boil at 170C when external pressure is 760 torr 170 torr 2115 torr 700 torr
45 At equilibrium rate of evaporation and rate of condensation Become very high Become very low Become equal Can never be equal
46 Correct order of intermolecular forces Gas &lt; liquid &lt; solid Liquid &lt; gas &lt; solid Gas &lt; liquid &lt; solid Gas = liquid = solid
47 The highest temperature in which a substance can exist as a liquid is called its Absolute temperature Critical temperature Maximum temperature Body temperature
48 Which of the following are more temperature senesitive Liquid crystals Solid crystals Ionic stals None of above
49 A semiconductor of Ge can be made p-type by adding Trivalent impurity Tetravalent Pentavalent impurity Divalent impurity
50 Which of the following metal oxides is antiferromanetic in nature? MnO<sub>2</sub> TiO<sub>2</sub> NO<sub>2</sub> CrO<sub>2</sub>
51 The amount of heat absorbed when one mole of a liquid is changed into vapours at its boiling point is called Heat of sublimation Heat of vaporization Heat of fusion Enthalpy change
52 Stronger the intermolecular forces Lower the Vapour pressure Greater the Vapour pressure May be smaller or greater None
53 Evaporation causes High temperature High pressure Cooling Vapour
54 The strength of dipole-dipole forces depends upon Electro negativity difference Distance between atoms Electropositivity difference Both A &amp; B
55 Van der Waal's forces exist in Polar compounds Non-polar Covalent All types of atoms and molecules
56 London dispersion forces are also called Ion-dipole forces Dipole-induced dipole forces Dipole-dipole forces Instantaneous dipole induced dipole forces
57 The total number of lattice arrangements in different crystal system is 7.0 3.0 8.0 14
58 Which of the following does not represent a type of crystal system Triclinic Monoclinic Rhombohedral Isotropical
59 The existence of a substance in more than one solid modification is known as Isomorphism Polymorphism Amorphism None of these
60 How many CI- ions are there around Na+ ion in NaCI crystal? 3 4 6 8
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