Uncategories Entry Test Preparation 2015, Chemistry BOOK 1 Chapter # 3 LIQUIDS AND SOLIDS MCQS with Answer Keys

Entry Test Preparation 2015, Chemistry BOOK 1 Chapter # 3 LIQUIDS AND SOLIDS MCQS with Answer Keys

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Entry Test Preparation 2015

Chemistry

BOOK 1

Chapter # 3

LIQUIDS AND SOLIDS

Direction

You are given following questions from the topic, with four choices A through D. Select the choice that will answer the question best.

1. Which of the following is an example of body centred cube?

A. Magnesium B. Zinc

C. Copper D. Sodium

2. Bragg’s law is given by equation

A. n

=2

sin

B. n

= 2 d sin

C. 2n

= d sin

D. n

= 1/2d sin

3. How many kinds of space lattices are possible in a crystal?

A. 23 B. 7

C. 230 D. 14

4. The ratio of close packed atoms to tetrahedral holes in cubic close packing is

A. 1 : 1 B. 1 : 2

C. 1 : 3 D. 2 : 1

5. The number of NaCl units in unit cell of its crystal is

A. 2 B. 4

C. 6 D. 8

6. If a liquid is made supercool by removing heat from it, the temperature drops below the freezing point and then rises suddenly. What is the source of the heat which causes the temperature rise?

A. the enthalpy of Vapourization B. the enthalpy of liquefaction

C. the enthalpy of fusion D. the entropy of fusion

7. How many crystallographic elements are present in a crystal:

A. 4 B. 6

C. 8 D. 10

8. Which of the following metal oxides is antiferromanetic in nature?

A. MnO₂ B. TiO₂

C. NO₂ D. CrO₂

9. Correct order of intermolecular forces

A. gas < liquid > solid B. liquid < gas < solid

C. gas < liquid < solid D. gas = liquid = solid

10. Water may boil at 170^oC when external pressure is

A. 760 torr B. 170 torr

C. 2115 torr D. 700 torr

11. Which of the following ion has tetrahedral structure:

A. CrO₄^2- B. S ^2-

C. CO₃ ^2- D. NO₃ ^1-

12. Glass is a

A. micro-crystalline solid B. super-cooled liquid

C. gel D. polymeric mixture

13. If the distance between Na⁺ and Cl- ions in sodium chloride crystal is X pm, the length of the edge of the unit cell is

A. 4X pm B. X/4 pm

C. X/2 pm D. 2X pm

14. 1212 packing is for _____

A. Cubic B. Hexagonal

C. Monoclinic D. None

15. Which is trigonal crystal

A. CaSO₄ . 2H₂O B. MgSO₄

C. NaNO₃ D. All

16. Which of the following molecules have a permanent dipole?

A. CH₄ B. CHCl₃

C. CCl₄ D. CO₂

17. Boiling point of H₂O is higher than that of HF although F is more electronegative than O. it is due to

A. stronger dipole dipole forces in H₂O

B. H₂O is neutral HF is acidic

C. H₂O is angular, but HF is linear

D. number of hydrogen bonds more in H₂O than in HF

18. Which order of vapour pressure in the following liquids is correct

A. water > ethanol > acetone > ether

B. ether > acetone > ethanol > water

C. ether > ethanol > acetone > water

D. water > ether > acetone > ethanol

19. Which of the following liquid has higher boiling point?

A. HCl B. HBr

C. H₂O D. Br₂

20. The temperature at which vapour pressure of a liquid is equal to the atmospheric pressure is called

A. boiling point B. melting point

C. freezing point D. crystallization point

21. The molecules of CO₂ in dry ice form the

A. ionic crystals B. covalent crystals

C. molecular crystals D. any type of crystal

22. Two substances that have the same crystal structure are said to be

A. isomorphous B. anisotropic

C. isotropic D. polymorphous

23. In NaCl crystal. Na⁺ ion is surrounded by how many ions of Cl^-

A. 4 B. 6

C. 8 D. 10

24. Which of these are isomrophous to one another:

NaCl, NH₄Br, K₂CrO₄, K₂SO₄

A. NaCl and NH₄Br both cubic

B. NH₄Br and K₂SO₄ both tetragonal

C. K₂CrO₄ and K₂SO₄ orthorhombic

D. NaCl and K₂SO₄both rhombohedral

25. A unit cell will unit cell dimensions a = b

c,

=

= 90^o,

= 120^o the crystal system is

A. tetragonal B. rhombohedral

C. orthorhombic D. hexagonal

26. Sugar crystals belong to the system

A. cubic B. monoclinic

C. tricilinic D. orthorhombic

27. Sugar crystals are examples of

A. non polar molecule B. polar molecules

C. ion dipole forces D. London dispersion forces

28. The forces of attraction between ions and water molecules are known as

A. dipole dipole forces B. London forces

C. dipole induced dipole forces D. ion dipole forces

29. The elements of the zero group in the periodic table are all

A. diatomic gases B. mono atomic gases

C. tri atomic gases D. tetra atomic gases

30. The compound that has zero dipole moment is

A. HCl B. H₂S

C. NH₃ D. CH₄

31. The amount of heat required to convert one mole of solid into liquid is called

A. molar heat of fusion B. heat of fusion

C. heat of vapourization D. heat of liquefaction

32. Acetone and chloroform are solube in each other due to

A. intermolecular hydrogen bonding

B. dipole dipole interaction

C. instantaneous dipoles

D. all of the above

33. Lattice energy is also termed as

A. ionization B. crystal energy

C. dissociation D. bond energy

34. The crystal systems are of

A. 7 types B. 10 types

C. 5 types D. 8 types

35. Diamond is a bad conductor because

A. it has a tight structure B. it has a high density

C. no free electron present in the crystal of diamond to conduct electricity D. none of the above

36. Enthalpy of vapourization at 298 ⁰C of water is

A. 79 KJ/ mol B. 28 KJ/ mol

C. 40 KJ /mol D. 65 KJ/ mol

37. Vapourization is always an/a

A. endothermic process B. exothermic process

C. Sometime heat absorbed or sometimes evolved

D. non of these

38. From the molecular view point, molecules evaporate from the surface of a liquid if they

A. have sufficient K.E to overcome the attractive forces in the liquid.

B. are attracted to other molecules in the vapour phase.

C. are in the state of dynamic equilibrium.

D. are repelled by other molecules in the liquid phase.

39. The reverse of melting, in which liquid is converted into solid is termed as

A. boiling B. sublimation

C. freezing D. vapourization

40. Which one of the following compound contains high value of surface tension?

A. hexane B. water

C. Mercury D. C₂H₅OH

41. Which of the following variables do you expect to affect vapour pressure of a liquid?

A. Temperature

B. Volume of liquid at equilibrium

C. Volume of vapour at equilibrium

D. Area of contact between liquid and vapour

42. The unit of surface tension is

A. dynes/cm B. ergs/cm²

C. J/m² D. all of the above

43. Which of the following crystal structures forms is isomorphous?

A. CaCO₃ and NaNO₃ B. ZnSO₄ and NiSO₄

C. NaF and MgO D. all of the above

44. When a =b

c and

, the crystalline system is

A. Cubic B. Hexagonal

C. Tetragonal D. Triclinic

45. When physical properties of crystals are different in different direction. The property is called

A. Symmetry B. Isotropy

C. Anisotropy D. none of these

46. Transition temperature is exhibited by

A. element B. compound

C. both elements and compounds

D. none of the above

47. The constant temperature at which the solid and liquid phases of a substance are in equilibrium is called

A. Boiling point B. melting point

C. critical temperature D. transition temperature

48. Non-wetting liquid forms

A. Concave meniscus B. Convex meniscus

C. Plane meniscus D. none of the above

49. Boiling point of the liquid increases with

A. heating B. Pressure

C. Volume D. Concentration of liquid

50. Due to surface tension. The surface area of the liquid is

A. Decreases B. Increases

C. Remain same D. Unchanged

Chapter # 3

ANSWERS

(LIQUIDS AND SOLIDS)

1	D	2	B	3	D
4	B	5	B	6	C
7	B	8	A	9	C
10	C	11	A	12	B
13	D	14	B	15	C
16	B	17	D	18	B
19	C	20	A	21	C
22	A	23	B	24	C
25	D	26	B	27	B
28	D	29	B	30	D
31	A	32	A	33	B
34	A	35	C	36	C
37	A	38	A	39	C
40	C	41	A	42	D
43	D	44	C	45	C
46	C	47	B	48	B
49	B	50	A

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