State of Matter 1000+ MCQ with answer for RRB NTPC

1. 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

2. A liquid of density 1.742 g $c{m}^{-3}$ is observed to show a capillary rise of 73 mm in a tube of radius 0.65 mm. Then the surface tension of the liquid is
A. 4.1 x ${}^{{10}^{-2}}$ dynes $c{m}^{-1}$
B. 4.1 x ${10}^3$ dynes $c{m}^{-1}$
C. 7.1 x ${10}^{-3}$ dynes $c{m}^{-1}$
D. None of these
Answer : B

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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

10. The wt. of 2.8 litres of a gas at N.T.P. is 3.50 gms. Its V.D. is
A. 20
B. 28
C. 32
D. 14
Answer : A

11. 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

12. In the gas equation PV = xT, x is a constant. The value of the constant depends upon
A. the quantity of gas
B. the quality of gas
C. type values of T and P
D. None of these
Answer : A

13. 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

14. 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

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

16. 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

17. 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

18. 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

19. 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

20. 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

21. The electrical conductivity of metals is of the order of
A. ${10}^{12}oh{m}^{-1}c{m}^{-1}$
B. ${10}^{8}oh{m}^{-1}c{m}^{-1}$
C. ${10}^{2}oh{m}^{-1}c{m}^{-1}$
D. ${10}^{-6}oh{m}^{-1}c{m}^{-1}$
Answer : B

22. 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

23. 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

24. 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

25. The vapour density of ozone would be
A. 72
B. 8
C. 48
D. 24
Answer : C

26. 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

27. 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

28. 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

29. In the wurtzite structure sulphur atoms have
A. cubic arrangement
B. hexagonal dose packed arrangement
C. body centred arrangement
D. None of these
Answer : B

30. Boltzmann constant is given by
A. R
B. R+N
C. R:N
D. R-N
Answer : C

31. 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

32. 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

33. The number of atoms per unit cell in bcc arrangement is
A. 1
B. 4
C. 3
D. 2
Answer : D

34. 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

35. 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

36. 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

37. 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

38. 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

39. 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

40. 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

41. 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

42. The radii of $A^{+}$ and $X^{-}$ are 95 pm and 181 pm respectively. Coordination number of $A^{+}$ is expected to be
A. 8
B. 6
C. 4
D. 3
Answer : B

43. 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

44. 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

45. 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

46. 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

47. 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

48. 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

49. Which compound possesses greatest lattice energy?
A. LiF
B. NaF
C. KF
D. CsF
Answer : A

50. 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