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MDCAT Chemistry Online Test
| Sr. # | Questions | Answers Choice |
|---|---|---|
| 1 | Which one of the following statements about diamond is not true? | the coordination number of carbon atoms is 4 diamond is an isotpe of graphite diamond has a high melting point diamond has a rigid tetrahedral, structure |
| 2 | Which of the following statement about graphite is not true? | The coordination number of carbon atoms is 4. the carbon atoms are arranged layers. the layers in graphite are attracted to each other weak forces. the corbon atoms use only three of their four outer electrons for covalent bonding. |
| 3 | Which of the following is not a macromolecule? | diamond graphite iodine silica |
| 4 | which one of the following exhibits intermolecular hydrogen bonding? | HF HC HBr HI |
| 5 | Honey contains glucose and fructose along with some other ingredients. It has greater viscosity due to: | irregular shape of the molecules greater molecular size and strong intermolecular forces H-bonding irregular shape of the molecules |
| 6 | The attracted forces which are created due to repulsion of electronic cloud of the molecules are: | ion-dipole forces dipole-dipole forces dipoles-induced dipole forces instantaneous dipole-induced dipole |
| 7 | Rte of evaporation of petrol is greater than that of water at room temperature. This is due to the reason that: | petrol is an organic compound water molecules have small size petrol molecules do not have petrol molecules have greater size |
| 8 | Which of the following is a pseudo solid? | CaF<sub>2</sub> glass NaCl all these |
| 9 | The molecule of CO2 in dry ice form are the: | ionic crystals covalent crystals molecular crystals any type of crystals |
| 10 | Amorphous solids: | have sharp melting point undergo clean cleavage when cut with knife have prefect arrangement of atoms can possesses small regions of orderly arrangement |
| 11 | The correct order of increasing attractive strength for weak intermolecular forces is.... | dipole-dipole interaction hydrogen bonding, van der Waals forces van der waals forces dipole- dipole interaction, hydrogen bonding hydrogen bonding, dipole-interaction, van der Waals forces hydrogen bonding, van der Waals forces, dipole-dipole interaction |
| 12 | Instantaneous dipole-induced dipole forces are also known as: | dipole-dipole interactions hydrogen bonds covlent bonds Van der Waals forces |
| 13 | In which one of the following does the central atom not possess an 'octet' in its outer shell? | BH<sub>3</sub> CH<sub>4</sub> NH<sub>3</sub> H<sub>2</sub>O |
| 14 | Covalent bonds are least likely to be formed: | between atoms of the same element between atoms of different elements on the right of the periodic table by head of the group elements with high ionization energies between an element in Group I and an element in Group Vll |
| 15 | The structure normally associated with ionic bonding is: | a giant lattice a simple molecule a giant molecule a regular arrangement of ions surrounded by a sea , or cloud, of electrons |
| 16 | Which one of the following statements about sodium chloride is incorrect? | it has a high melting point it conducts electricity at room temperature it is soluble in water it is brittle |
| 17 | A student put two eggs A and B in HCL solution, After five minutes he took them out for weighing but egg dropped in water accidentally. The student was able to take it out after 30 minutes, He weighed it, Its weight was 40.33g. Weight of egg B was also 40.33g. Teacher told him that if both eggs have been dropped in water, the weight of egg B would have been: | equal to that of egg A less than that of egg A greater than that of egg A unaffected instead |
| 18 | London forces are more affective at: | high temperature low temperature low pressure high pressure |
| 19 | Lonic solids are characterized by: | low melting points <sub>good conductivety in solid state</sub> high vapour pressures solubility in polar solvents |
| 20 | In order to mention boiling point of water at 110∘C the external pressure should be:- | between 760 torar an 1200 torr between 200 torr and 760 torr 765 torr any value of preessure |
| 21 | What water freezes at 0∘ , Its density decreases dues to: | cubic structure of ice empty spaces present in the structure change of bond lengths change of bond angles |
| 22 | Aluminium is in Group lll, its oxide will have the formula. | AlO AlO<sub>2</sub> Al<sub>2</sub>O<sub>3</sub> Al<sub>3</sub>O<sub>2</sub> |
| 23 | Which one of the following pair of atoms is most likely to form an inoic bond? | Na and F C and F N and F O and F |
| 24 | Which of the following successive ionization energies belong to a Group ll element? | 320,600,1110,1700,5650, 577,1820,2740,1160,14800, 428,3070,4600,5860,7990 736,1451,7740,10500,13600 |
| 25 | Which of the following equations represents the 2nd ionization energy of Na? | Na(g) ---> Na<sup>2+</sup> (g) + 2e<sup>-</sup> Na(s) ---> Na<sup>2+</sup> (g) + 2e<sup>-</sup> Na<sup>+</sup>(s) ---> Na<sup>2+</sup> (g) + e<sup>-</sup> Na<sup>+</sup>(g) ---> Na<sup>2+</sup> (g) + e<sup>-</sup> |
| 26 | Which one of the following equations represents the 1st ionization energy of Na? | Na(s) ---->Na<sup>+ </sup> (g) + e<sup>-</sup> Na(g) --->Na<sup>+</sup> (g) + e<sup>-</sup> Na(s) --->Na<sup>+</sup> (s) + e<sup>-</sup> Na (s) + e<sup>-</sup> ---> Na<sup>+</sup> (g) |
| 27 | which one of the following statements bout negative ions is incorrect? | they are also know as anions they are formed when atoms gain electrons they are large than the atom from which they were formed they are smaller than the atom from which they were formed |
| 28 | Which one of the following statements about positive ions is incorrect? | they are also known as cations they are formed when electrons are removed from atoms they are larger than the atom from which hay were formed they are smaller than the atom from which they were formed |
| 29 | Which one of the following is not a form of chemical bonding? | covalent bonding hydrogen bonding ionic bonding metallic bonding |
| 30 | chemist was able to measure the value of lattice energy of KCI to be 690 kj/mol. From this experiment , he concluded that: |
lattice energy of KBr is 665 kj/mol and that of Ki is 630 kj/mol lattice energy of KBr is 765 kj/mol and that of Kl 730 kj/mol lattice energy of KBr is 730 kj/mol and that of Ki 765 kj/mol lattice energy of KBr is 630 kj/mol and that of kL 665 KJ/mol |
| 31 | All of following acids have hydrogen bond in liquid state except: | nitric acid sulphuric acid hydrochloric acid hydrofluoric acid |
| 32 | what is it difficult to cook food at high as compared to at sea level? Choose the correct reason. | H-bonding in H<sub>2</sub>O changes with height temperature at the top of mountain is low density of water decreases at the mountain boiling point of water decreases at the mountain |
| 33 | NH3 shows a maximum boiling point among the hydrides of V-A group elements due to : | very small size of nitrogen lone pair of electrons present on nitrogen enhanced electronegative character of nitrogen pyramidal structure of NH<sup>3</sup> |
| 34 | Acetone and chloroform are soluble in each other due to: | intermolecular hydrogen bonding dipole-dipole interaction instantaneous dipoles all of the above |
| 35 | London dispersion forces are the only force present among the: | molecules of water in liquid state atoms of helium in gaseous state at high temperature molecules of solid iodine molecules of hydrogen chloride gas |
| 36 | Which of the following least resemble an ideal gas? | ammonia helium hydrogen trichloromethane |
| 37 | The density of ice is 1.00gcm-3. What the volume of steam produced when 1.00-3 of ice is heated to 323∘C (596K) at a pressure of one atmosphere (101kPa)? [1 mol a gas occupies 24.0dm3 at 25a∘C(295K)and one atmosphere.] |
0.267 dm<sup>3</sup> 1.33 dm<sup>3</sup> 2.67 dm<sup>3</sup> 48.0 dm<sup>3</sup> |
| 38 | Which is the following would have most like an ideal gas at room temperature? | carbon dioxide helium hydrogen nitrogen |
| 39 | Which of the following least resembles an ideal gas? | ammonia helium hydrogen trichloromethane |
| 40 | According to kinetic molecular theory, kinetic energy of molecules increases when they are: | melted from solid to liquid state frozen into a solid condensed into liquid mixed with other molecular at low temperature |
| 41 | Which is the incorrect value of gas constant R? | 2.987 cal k<sup>-1</sup> mol <sup>-1</sup> 3.313 Nmk<sup>-1</sup> mol<sup>-1</sup> 62400dm<sup>3 </sup> atm k<sup>-1</sup> mol<sup>-1</sup> 1.10821atm dm3k<sup> -1</sup> mol<sup>-1</sup> |
| 42 | Choose the gas law which gives relationship between volume and pressure: | Bolye,s law Graham,s law Dalton,s law Charles,s law |
| 43 | Mathematically, Boyle's law is indicated as: | VT = K PT = K PV = K None of these |
| 44 | The molar volume of CO2 is maximum at: | S.T.P. (0<sup>∘</sup>C and 1 atm) 127<sup>∘</sup>C and 1 atm 0<sup>∘</sup>C and 2 atm 273<sup>∘</sup>C 2atm |
| 45 | Elastic collision involves: | gain of energy loss of energy no relationship between elastic no gain or loss of energy |
| 46 | Matter having no definite shape and volume is called: | gas liquid solid plasma |
| 47 | Which thermometer will have its reading 273 degrees greater than that of thermometer C? | A B B has 273 degrees greater than A C has greater reading than all other thermometers |
| 48 | All the following statements are incorrect except: | all of the gases cannot be liquefied increase of pressure will not decrease the inter molecular distance in a gas gas molecules do not attract each other at very low temperature actual volume of a gas is not negligible at very pressure |
| 49 | The gases suddenly if these are allowed to expand: | react cool down heat up moved randomly |
| 50 | suppose that an ocean of mercury replaced all the air of the air of the earth . How deep would this ocean have to be to exert the same pressure as the air: | 77cm 76cm 79cm 78cm |
| 51 | consider the physical properties of the gases. Which of the following statements about particles of gases is incorrect? The particles are: | causing pressure having wide spaces orderly arranged randomly moving |
| 52 | A pressure of 1Nm-2 is equal to: | one bar one pascal stalagmometer one aomosphere |
| 53 | If pressure is increased from a 2 atm to 4 atm on a gas then its volume will decrease from: | 3L to 1L 4L to 2L 6L to 4L 8L to 2L |
| 54 | Which one is not postulated in the kinetci molecular theory among the following? | molecules are in chaotic motion molecules of all the gases have same size and same mass the volume of the molecules is negligible all molecular collisions are elastic |
| 55 | By increasing temperature,the transition from a gas to an ionized gas gives free electrons called: | UV radiation gas phase plasma vapour density |
| 56 | Gases deviate from ideal behaviour at high pressure.Which of the following is correct for non-ideality? | at high pressure the gas molecules move in one direction only at high pressure the collisions between the gas molecules are increased manifold a high pressure the volume of the gas become insignificant at high pressure, the intermolecular attraction becomes significant |
| 57 | A teacher told his student that air is a mixture. This is due to the reason that suddenly a student raised his hand and said: | it has different properties from its constituents oxygen can be removed from it it is colourless its composition is different at different altitudes. |
| 58 | To measure the true pressure of a gas collected over water, the pressure due to water vapoure is: | added to the total pressure multiplied to the total pressure divided by the total pressure subtracted form the total pressure |
| 59 | At constant temperature, volume of given mass of gas in inversely proportional to pressure on it. This statement is according to: | Hook's law Graham's law Bolye's law Charle's law |
| 60 | A gas has non-ideal behaviour at: | high temperature and high pressure low temperature and low pressure high temperature and low pressure low temperature and low pressure |
