State of Matter 1000+ MCQ with answer for RBI Assistant

1. 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

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

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

9. 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

10. 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

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. 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

13. 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

14. 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

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

16. 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

17. 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

18. 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

19. 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

20. 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

21. 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

22. 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

23. 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

24. 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

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

26. 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

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 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

29. 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

30. 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

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

32. 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

33. At 303 K ethanol has a vapour pressure of about 0.118 atm., acetic acid has the vapour pressure of about 0.039 atm., and ethyl iodide has a vapour pressure of about 0.263 atm. Which of the following represents the correct order of increasing normal boiling point ?
A. $C{H}_{3}COOH<C_2{H}_{5}OH<C_2{H}_{5}I$
B. $C_2{H}_{5}I<C{H}_{3}COOH<C_2{H}_{5}OH$
C. $C_2{H}_{5}I<C_2{H}_{5}OH<C{H}_{3}COOH$
D. $C_2{H}_{5}OH<C_2{H}_{5}I<C{H}_{3}COOH$
Answer : C

34. Which of the following is an amorphous solid?
A. NaCl
B. $Ca{F}_2$
C. Diamond
D. Glass
Answer : D

35. 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

36. 22.4 litre of any gas at N.T.P. will contain
A. One gram equivalent
B. One gram atomic weight
C. One gram atom
D. One gram molecule
Answer : D

37. 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

38. Kinetic gas equation is, PV =...
A. nRT
B. $\frac{3}{3}$RT
C. $m{n}^1{c}^2$
D. $\frac{1}{3}mn{c}^2$
Answer : D

39. 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

40. The number of atoms in 0.004 gm of magnesium is close to
A. 36x ${ }^{{10}^5}$
B. ${ }^{{10}^{20}}$
C. 5 x ${ }^{{10}^{20}}$
D. 6.02 x ${}^{{10}^{23}}$
Answer : B

41. 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

42. 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

43. 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

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

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

46. 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

47. 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

48. 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

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

50. 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