1000+ State of Matter Multiple Choice Question Answer [Solved]

1. Certain volume of a gas exerts on its walls some pressure at a particular temperature. It has been found that by reducing the volume of the gas to half its original value, the pressure becomes I twice that the initial value of constant temperature. This happens because
A. More number of a gas molecules strike the surface per second
B. Velocity of the gas molecules increases
C. Gas molecules attract each other
D. Weight of the gas increase with volume
Answer : C

2. At what temperature, the root mean square velocity of oxygen molecules is equal to that of $S{O}_2$ at 27°C?
A. 150°C
B. 150°K
C. 27°C
D. None of these
Answer : B

3. Lattice energy of a solid is high if
A. the radii of the ions are large
B. radii of the ions are small
C. charge on the ions are small
D. the ions are neutral
Answer : B

4. 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

5. A vessel containing 10 litre of air at atmospheric pressure is connected to an evacuated 9 litre vessel The resulting pressure will be
A. 2 atm
B. 31 atm
C. 0.526 atm
D. 52.6 atm
Answer : C

6. In a closed packed structure the pattern ABAB...... represents which one of the following:
A. ccp
B. hcp
C. fccp
D. bcc
Answer : B

7. 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

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

9. Indicate the most viscous liquid of the following
A. propanol-2
B. 1.2, ethandiol
C. 1.2,3 propentriol
D. ethanol
Answer : C

10. 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

11. 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

12. 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

13. 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

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

15. Gases deviate from the ideal behaviour because their molecules
A. possess negligible volume
B. have forces of attraction between them
C. are polyatomic
D. are not attracted to one another
Answer : B

16. Which one of the following contains same number of molecules as 4.4 gm of carbon dioxide (mol. wt. of $C{O}_2$ = 44, Mol, wt. of $S{O}_2$ = 64)?
A. 64 gm of sulphur dioxide
B. 4.4 gm of sulphur dioxide
C. 6.4 gm of sulphur dioxide
D. 3.2 gm of sulphur dioxide
Answer : C

17. Density of a gas relative to air is 2.3. If the average molar mass of air is 29.08/mol, the molecular mass of the gas will be
A. 29 gm/mole
B. 66.7 gm/mole
C. 12.67 gm/mole
D. 25.22 gm/mole
Answer : B

18. 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

19. 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

20. 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

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

22. 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

23. 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

24. 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

25. The coordination number of each sphere in hcp arrangement is
A. 12
B. 8
C. 6
D. 4
Answer : A

26. 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

27. 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

28. 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

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

31. 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

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

33. Volume occupied by 4.4 gift of carbon dioxide is
A. 4.4 litres
B. 2.24 litres
C. 22.4 litres
D. 4.48 litres
Answer : B

34. The vol. of 20 gms of nitrogen at N.T.P.
A. 16 litres
B. 36 litres
C. 8 litre
D. 32 litres
Answer : C

35. 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

36. In a face centred cubic arrangement of ions, the coordination number of ions is
A. 6
B. 8
C. 12
D. 4
Answer : C

37. Which of the following phrases would be incorrect to use?
A. An atom of an element
B. An atom of a compound
C. A molecule of a compound
D. A molecule of an element
Answer : C

38. 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

39. In NaCl type structure, the coordination number of the cation and anion are
A. 6 and 4
B. 6 and 6
C. 4 and 4
D. 8 and 4
Answer : B

40. The ratio of RMS velocity to average velocity of a gas molecule at a particular temperature is
A. 1.086:1
B. 1:1.086
C. 2 :1.086
D. 1.086 : 2
Answer : A

41. 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

42. 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

43. From the Dulong and Petit's law atomic weight is given by which one of the following relations?
A. 6.41 sp. heat
B. 6.4/sp. heat
C. sp. heat/6.4
D. sp. heat/6.4 x 2
Answer : A

44. 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

45. The vapour density of a gas in 35.5. The volume occupies by 3.55 gms of the gas at N.T.P. is
A. 224 litres
B. 2.24 litres
C. 11.12 litres
D. 1.12 litres
Answer : A

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

47. 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

48. The V.D. of a gas is 11.2 gm. The volume occupied by 11.2 gm. of this gas at N.T.P. is
A. 12 litre
B. 11.2 litres
C. 2.24 litres
D. 22.4 litres
Answer : A

49. In what ratio by mass carbon monoxide and nitrogen should be mixed so that partial pressure exerted by each gas is same?
A. $m\left(N_2\right)=m\left(CO\right)$
B. $m\left(N_2\right)=2m\left(CO\right)$
C. $m\left(N_2\right)=0.5m\left(CO\right)$
D. None of these
Answer : A

50. The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure:
A. critical temperature
B. Boyle's temperature
C. inversion temperature
D. reduced temperature
Answer : B