ESIC - State of Matter 1000+ MCQ [Solved] PDF Download

1. The critical temperature of a substance is defined as
A. the temperature above which the substance decomposes
B. the temperature above which the substance can exist only as a gas
C. melting point of the substance
D. boiling point of the substanc
Answer : B

2. Chloroform and benzene form a pair of miscible liquids. These can be separated by
A. a separating funnel
B. distillation
C. sublimation
D. filtration
Answer : B

3. In fluorite structure coordination number of calcium ions is
A. 4
B. 6
C. 8
D. 3
Answer : C

4. What types of forces are present in molecular solids?
A. electrovalent bonds
B. hydrogen bonds
C. metallic bonds
D. Van der Waal's forces
Answer : D

5. Cubic close packed arrangement of ions is described as
A. ABC AB ABC.....
B. ABC ABC......
C. AB AB..........
D. ABC CBA...
Answer : B

6. The relation between molecular wt. and vapour density is
A. Molecular wt. = $\frac{2}{3}$ V.D.
B. Molecular wt. = $\frac{1}{3}$ V.D.
C. Molecular wt. = V.D.
D. Molecualr wt = 2 x V.D.
Answer : A

7. A closed vessel contains equal number of molecules of a total pressure at 740 mm. If oxygen is removed from the system the pressure will
A. become half of 740 mm
B. remain unchanged
C. become 1/9 of 740 mm
D. become double of 740 mm
Answer : A

8. In the process of sublimation, the substance transforms directly
A. from the solid state to the liquid state
B. from the liquid state to gaseous state
C. from the solid state to gaseous state
D. from the liquid state to solid state
Answer : C

9. In zinc blende structure, the zinc atoms occupy
A. all tetrahedral sites
B. all octahedral sites
C. half of the octahedral sites
D. half of the tetrahedral sites
Answer : D

10. An open vessel at 37°C is heated until 3/5 of the air in it has been expelled. Assuming that the volume of the vessel remains constant the temperature to which the vessel is heated is
A. 502°C
B. 502 K
C. 243.67°C
D. 925C
Answer : A

11. In which one of the following does diffusion occur most rapidly?
A. Solid
B. Liquid
C. Gases
D. Gels
Answer : C

12. The Van der Waal's equation explains the behaviour of
A. ideal gases
B. real gases
C. vapours
D. non-real gases
Answer : B

13. Which of the following is an example of covalent network solid?
A. Sodium
B. Solid carbon dioxide
C. Sodium chloride
D. Silicon
Answer : D

14. For a given gas at temperature T and pressure P the root mean square velocity (RMS) is C; then at temperature T and pressure 3P the RMS is
A. Unchanged
B. 3C
C. C/3
D. $C^3$
Answer : A

15. The mean free path of a gas molecule is the distance
A. between the two opposite walls of the container
B. through which the molecules travel in one second
C. through which molecules move between two consecutive collisions
D. travelled by all the molecules divided by the total number of molecules in a particular gas
Answer : C

16. When an ideal gas undergoes unrestricted expansion, no cooling occurs because the molecules
A. are above inversion temperature
B. exert no attractive force on each other
C. do work equal to loss in kinetic energy
D. collide without loss of energy
Answer : B

17. The ionic radii of $M{g}^{+2 }$ and $O^{-2}$ are 0.66 $\stackrel{°}{A}$ and 1.40 $\stackrel{°}{A}$ , respectively. The most probable type of gteometry exhibited by MgO on the basis of radius ratio rule is
A. NaCl type
B. CsCl type
C. ZnS type
D. Boron oxide type
Answer : A

18. An example of covalent solid is
A. diamond
B. NaCl
C. Copper
D. $C{O}_2$
Answer : A

19. 5.At a given temperature and pressure 2 volumes of A combine with 5 volumes of B to form 2 volmes of C and 1 volume. A combine with one volume of B to form 2 volumes of D. The formula of C is
A. $A_3{B}_6$
B. $\sqrt{AB}$
C. $A_2{B}_5$
D. $A{B}_5$
Answer : B

20. According to Avogadro's hypothesis equal volumes of two gases under the same conditions of temperature and pressure contain
A. Equal number of electrons
B. Equal number of ions
C. Equal number of atoms
D. Equal number of molecules
Answer : D

21. A chalk box exhibits
A. cubic geometry
B. monoclinic geometry
C. orthorhombic geometry
D. tetragonal
Answer : A

22. In a solid atoms A are arranged in ccp array. Atoms B occupy all the octahedral voids and half the tetrahedral voids. The formula of the compound is expected to be
A. $A{B}_2$
B. $A{B}_3$
C. $A_2{B}_3$
D. $A_{2}B$
Answer : A

23. When there is more deviation in the behaviour of a gas from ideal gas equation PV = nRT
A. at high temperature and low pressure
B. at low temperature and high pressure
C. at high temperature and high pressure
D. at low temperature and low pressure
Answer : B

24. In a close packed arrangement of N spheres, the number of octahedral holes are
A. N
B. 2N
C. 4N
D. 8N
Answer : A

25. The vapour density of a gas is 11.2. The volume occupied by 2.4 g of the gas at S.T.P wil be
A. 2.4 litres
B. 3.6 litres
C. 2.24 litres
D. 11.2 liters
Answer : D

26. Molecular formula of D in the above case is
A. $A{B}_5$
B. $A_5{B}_2$
C. $A_2{B}_5$
D. AB
Answer : D

27. The molecular weight of a volatile liquid can be determined by
A. Dumas' method
B. Victor Meyer's method
C. Cryoscopic method
D. Osmotic pressure
Answer : B

28. The molecular velocity of any gas is
A. proportional to absolute temperature
B. proportional to the square root of absolute temperature
C. independent of temperature
D. proportional to die square of absolute temperature
Answer : B

29. The vapour density of gas A is four times that of gas B. If the molecular weight of gas B is M, then the molecular weight of gas A is
A. 2M
B. 4M
C. 8M
D. M/4
Answer : B

30. The best electrical conductor of the following is
A. $C{O}_2$(s)
B. Si(s)
C. NaCl (fused)
D. $B{r}_2$(I)
Answer : C

31. Arrange the following in order of increasing inter-molecular forces and boiling points:$N{H}_3$,He,$C{l}_2$
A. $He<C{l}_2<N{H}_3$
B. $He>C{l}_2>N{H}_3$
C. $C{l}_2<He<N{H}_3$
D. $N{H}_3<He<C{l}_2$
Answer : A

32. In the ideal gas equation PV = nRT constant 'R' has the unit
A. joule
B. litre/mol
C. lit-atm/deg/mol
D. calorie/mole
Answer : C

33. If all the octahedral sites in a cubic close packed arrangement ($B^{-}$) are completelyfilled with $A^{+}$ cations, the empirical formula of the compound could then be
A. $A{B}_2$
B. $A_{2}B$
C. AB
D. None of these
Answer : C

34. The weight of 11.2 litres of $C{O}_2$ at S.T.P. would be
A. 22 gms
B. 66 gms
C. 11 gms
D. 16 gms
Answer : D

35. The ionic radii of $R{b}^{+}$ and $B{r}^{-}$ ions are 1.47 $\stackrel{°}{A}$ and 1.95 $\stackrel{°}{A}$, respectively. The most probable type of geometry exhibited by RbBr on the radius ratio rule is
A. NaCl type
B. CsCl type
C. Zinc blende structure
D. Wurtzite structure
Answer : B

36. What will be the mass of 6.023 x ${10}^{23}$ molecules of carbon monoxide?
A. 14 gm
B. 28 gm
C. 16 gm
D. 44 gm
Answer : D

37. To which of the following mixtures is the Dalton's law of partial pressures not applicable?
A. $H_2+O_2$
B. $N_2+O_2$
C. NO + $O_2$
D. Xe + Ar
Answer : C

38. In anti-fluorite structure the negative ions
A. occupy tetrahedral voids
B. occupy octahedral voids
C. are arranged in ccp
D. are arranged in hcp
Answer : C

39. The number of tetrahedral and octahedral voids per atom in a crystal lattice are, respectively
A. 1,1
B. 2,2
C. 2,1
D. 2,6
Answer : C

40. 6.If the reactants and products both are in gaseous phase they bear a simple ratio in their
A. volumes
B. molecules
C. atoms
D. temperature
Answer : A

41. Absolute zero is the temperature at which
A. water freezes
B. all gases become liquid
C. all substances are solid
D. molecular motion ceases
Answer : D

42. A balloon filled with ethane is pricked up with sharp point and quickly plunged into a tank of hydrogen at the same pressure. After some time balloon will
A. be enlarged
B. be collapse
C. remain unchanged in size
D. have half its volume of the gas
Answer : A

43. In a dose packed arrangement of N spheres, the number of tetrahedral holes are
A. N
B. 2N
C. N/2
D. $N_2$
Answer : B

44. The number of molecules is 4.25 g of ammonia are approximately
A. 3.5 x ${}^{{10}^{23}}$
B. 2.5 x ${}^{{10}^{23}}$
C. 1.5 x ${}^{{10}^{23}}$
D. 0.5 x ${}^{{10}^{23}}$
Answer : D

45. The number of molecules in 4.25 gm of ammonia are approximately
A. $0.5\times {10}^{23}$
B. $1.5\times {10}^{23}$
C. $2.5\times {10}^{23}$
D. $3.5\times {10}^{23}$
Answer : B

46. Volume occupied by 1 gm equivalent of oxygen at NTP is
A. 22.4 litres
B. 2.24 litres
C. 5.6 litres
D. 11.2 litres
Answer : C

47. Which of the following statement wrong?
A. In solid state molecules, atoms or ions are held with a strong force of attraction and are in a fixed position
B. In liquid state the molecules, atom or ions are held with a strong force and have a restricted motion
C. In gaseous states, the molecules are randomly arranged and are apart from each other
D. Solid, liquid and gaseous states have different movement is particles
Answer : B

48. Four 1 litre flasks are separately filled with the gases hydrogen, helium, oxygen and ozone at the same temperature and pressure, the ratio of total number of atoms of these gases present in the different flasks would be
A. 3:2:2:1
B. 2:1:2:3
C. 1:2:2:3
D. 1:1:1:1
Answer : C

49. What will be the mass of 6.03 x ${}^{{10}^{23}}$ molecules of carbon monoxide ?
A. 18.00
B. 28.01
C. 56.02
D. 14.05
Answer : B

50. The space occupied by spheres in ccp arrangement is
A. 74.06%
B. 68.05%
C. 60.4%
D. 52.4%
Answer : A