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

1. The vapour density of pure ozone would be
A. 32
B. 8
C. 12
D. 24
Answer : B

2. 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

3. 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

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

5. 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

6. 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

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

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

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

10. 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

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

14. 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

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

17. 20 litres of hydrogen gas weighs about
A. 1.8 g
B. 3.6 g
C. 224 g
D. 12.2 g
Answer : A

18. 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

19. 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

20. One gram molecule of a gas at N.T.P occupies 22.4 litres. This fact was derived from
A. Benjamin hypothesis
B. Avogadro's hypothesis
C. Dalton's theory
D. Law of atomic volume
Answer : C

21. All gases tend to show ideal behaviour
A. at low temperature and low pressure
B. at high temperature and high pressure
C. at high temperature and low pressure
D. at low temperature and high pressure
Answer : C

22. 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

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

24. 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

25. 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

26. 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

27. 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

28. How many moles of water are present in 180 gm. of water ?
A. 11
B. 5
C. 90
D. 21
Answer : D

29. 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

30. 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

31. 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

32. 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

33. Which of the following methods is used to determine the atomic weight?
A. Victor Meyer's method
B. Dumas' method
C. Cannizaro's method
D. None of these
Answer : C

34. 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

35. 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

36. 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

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

38. 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

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. 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

41. 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

42. 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

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

44. Three dimensional array of points in space is called
A. unit cell
B. crystal lattice
C. micro-crystal
D. None of these
Answer : A

45. 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

46. 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

47. 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

48. 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

49. 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

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