State of Matter MCQ Solved Paper for LSAT

1. The number of molecules in 32 gms of oxygen in
A. 6.02 x ${}^{{10}^{10}}$
B. 3.2 x ${}^{{10}^{23}}$
C. 6.02 x ${}^{{10}^{22}}$
D. 32 x ${}^{{10}^{10}}$
Answer : A

2. 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

3. 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

4. Indicate the most volatile liquid of the following:
A. $C{H}_{3}OH$
B. $C{H}_{3}OC{H}_3$
C. $H_{2}O$
D. $C{H}_{3}C{H}_{2}OC{H}_{2}C{H}_3$
Answer : D

5. 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

6. The pressure of the ideal gas is less than the real gas because of the
A. increase in the number of collisions
B. volume occupied by the molecules
C. inter-molecular attraction
D. finite size of molecules
Answer : C

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

8. If the temperature and pressure remain unchanged the volume of $O_2$obtained by the decomposition of a certain volume of $S{O}_2$ will be
A. Triple the volume of $S{O}_2$
B. Half the volume of $S{O}_2$
C. Equal to the volume of $S{O}_2$
D. One third the volume of $S{O}_2$
Answer : C

9. 1.The correct relationship representing the volume occupied by 44 gm of $C{O}_2$ and 64 gm of $S{O}_2$ at constant temperahire and pressure:
A. V($C{O}_{2 }$) > V($S{O}_2$)
B. V($C{O}_{2 }$) = V($S{O}_2$)
C. V($S{O}_2$) > V($C{O}_{2 }$)
D. cannot be predicted
Answer : B

10. At a given temperature and pressure 2 volumes of A combine with 5 volumes of B to form 2 volumes of C, and 1 volume of A combines with one volume of B to form 2 volumes of D. Then the formula of C is
A. $A{B}_5$
B. $A_5{B}_2$
C. $A_2{B}_5$
D. $AB$
Answer : C

11. 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

12. 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

13. The average kinetic energy of the molecule of $S{O}_2$ (moL wt. = 64) at 27°C is E. Then the average kinetic energy of $C{O}_2$ at 27°C is
A. $\frac{E\times 64}{44}$
B. $\frac{E\times 44}{64}$
C. E
D. 22E
Answer : C

14. If the tetrahedral sites in ccp arrangement of negative ions (Y) were half filled with cation (X), the empirical formula of the compound would be
A. $X_{2}Y$
B. XY
C. $X{Y}_2$
D. $X_2{Y}_3$
Answer : B

15. 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

16. 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

17. The limiting radii ratio for the tetrahedral geometry is
A. 0.155
B. 0.444
C. 0.732
D. 0.225
Answer : D

18. How many nearest neighbours are there in an atom or ion in an octahedral hole of a close packed structure?
A. 4
B. 6
C. 8
D. 18
Answer : B

19. Which of the following will have low heat of fusion?
A. a molecular solid
B. an ionic solid
C. a metallic solid
D. a network of covalent solid
Answer : A

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

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

22. 22.4 litres of $S{O}_2$ at 27.3°C and 1 atmosphere pressure shall weigh
A. 32 g
B. 16 g
C. 44.8 g
D. 48.5 g
Answer : D

23. Number of molecules of carbon dioxide present in 44 gm $C{O}_2$ is
A. 12 x ${}^{{10}^{23}}$ approximately
B. 3 x ${ }^{{10}^{10}}$ approximately
C. 6 x ${ }^{{10}^{10}}$ approximately
D. 3 x ${}^{{10}^{23}}$ approximately
Answer : C

24. The kinetic theory of gases predicts that total kinetic energy of a gaseous assembly depends upon the
A. pressure of a gas
B. temperature of the gas
C. volume of the gas
D. pressure, temperature and volume of the gas
Answer : B

25. 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

26. Equal weights of methane and hydrogen are mixed in an empty container at 25°C. The fraction of the total pressure exerted by methane is
A. 1/2
B. 1/3
C. 1/9
D. 8/9
Answer : C

27. Sodium chloride has fee structure. How many $N{a}^{+}$ and $C{l}^{-}$ ions are there in the unit cell?.
A. 6 and 6
B. 4 and 4
C. 1 and 1
D. 6 and 4
Answer : B

28. The weight of 22.4 litres of any gas at N.T.P. represent its
A. gm atomic weight
B. gm molecular weight
C. gm equivalent weight
D. None of these
Answer : B

29. 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

30. The number of atoms per unit cell in simple cubic, face centred cubic and body centred cubic arrangement are, respectively
A. 8,14,9
B. 1,2,4
C. 1,4,2
D. 8,4, 2
Answer : C

31. The number of molecules of $C{O}_2$ present in 44 gms. of $C{O}_2$ is
A. 6 x ${}^{{10}^{23}}$ approx
B. ${10}^{30}$ approx
C. 3 x ${}^{{10}^{10}}$ approx
D. 12 x ${ }^{{10}^{23}}$ approx
Answer : B

32. Avogadro stated that under similar conditions of temperature and pressure equal volumes of all gases contain equal number of
A. atoms
B. molecules
C. electrons
D. ions
Answer : B

33. Vapour density of a gas is 35.5. The volume occupied by 3.55 gm of the gas at NTPis
A. 1.12 litres
B. 2.24 litres
C. 22.4 litres
D. 11.2 litres
Answer : A

34. 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

35. 20 litres of hydrogen gas weighs about
A. 1.8 g
B. 3.6 g
C. 224 g
D. 12.2 g
Answer : A

36. 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

37. 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

38. 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

39. Which of the following should be most viscous?
A. $C{H}_{3}OH$
B. $C{H}_{3}C{H}_{2}OH$
C. $C{H}_{3}OC{H}_3$
D. $HOC{H}_{2}C{H}_{2}OH$
Answer : D

40. Normal boiling points values are for $N{H}_3$, - 34C, bromine 58°C, carbon tetrachloride 77°C and oxygen - 183°C. Which of these liquids has the highest vapour pressure at room temperature?
A. $N{H}_3$,
B. $B{r}_2$
C. $CC{l}_4$
D. $O_2$
Answer : D

41. Match box has the symmetry of which of the following systems?
A. Cubic
B. Orthorhombic
C. Tetragonal
D. Monoclinic
Answer : A

42. In a unit cell of cesium chloride the arrangement of cesium ions is
A. face centred cubic
B. hexagonal close packed
C. body centred cubic
D. simple cubic
Answer : C

43. The vapour density of completely dissociated sociated $N{H}_{4}CL$ would be
A. Determined by the amount of solid $N{H}_{4}CL$ used in the experiment
B. Triple to that of $N{H}_{4}CL$
C. Half of that $N{H}_{4}CL$
D. Slightly less than half of that of $N{H}_{4}CL$
Answer : C

44. Which of the following would you expect to affect the vapour pressure of a liquid?
A. Inter-molecular forces in the liquid
B. Volume of the liquid in the liquid-vapour equilibrium
C. Volume of the vapour in the liquid-vapour equilibrium
D. The size of the container in which liquid-vapour equilibrium is establishe
Answer : A

45. What is the vapour pressure of benzoyl chloride at its boiling point (197°C)?
A. 760 torr
B. 380 torr
C. 197 torr
D. None of these
Answer : A

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

47. Correct gas equation is
A. $\frac{P_1{V}_1}{P_2{V}_2}=\frac{T_1}{T_2}$
B. $\frac{V_1{T}_2}{P_1}=\frac{P_2{T}_1}{T_2}$
C. $\frac{P_1{T}_1}{V_1}=\frac{P_2{T}_2}{V_2}$
D. $\frac{V_1{V}_2}{T_1{T}_2}=P_1{P}_2$
Answer : A

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

49. One mole of gas is defined as
A. The number of molecules in 22.4 litres of gas at S.T.P
B. The number of molecules contained | in 6 grams of 12 C isotope
C. The number of molecules in one formula weight of gas
D. The number of molecules in litre of gas
Answer : C

50. Kinetic theory of gases postulates :
A. The molecules in a gas are in stationary state
B. The molecules in a gas exert appreciable attraction on each other
C. The molecules move in a random motion with widely different velocities
D. The molecules in a gas collide against each other as well as the wall of the container, but do not change their direction of motion
Answer : C