1) How many significant figures are there in 4.000 x 102g.

 

1      (a) 1        (b)      2                   (c)     3                    (d)     4

 

2) Evaluate the following computation to the proper number of significant figures

1.62 x 3.628

3.650 + 0.022

 

(a) 1.60                   (b) 1.600    (c) 1.601                  (d) 1.60 x 10-2                               (e) none of the above

 

3) 177 K is equal to:

 

(a)     – 330oF    (b) 100oC                 (c) 350oC (d) – 96oC                 (e) – 196oC

 

4) The mass of 5 atoms of oxygen (M.Wt = 15.99u) is:

 

(a) 2.066 x 10-23g   (b) 2.657 x 10-23g   (c) 1.328 x 10-22g

(d) 179.995 g          (e) 6.022 x 1025g

 

5) How many grams of Al are present in 0.250 mol Al2O3 (Atomic wts., Al = 26.981u / O = 15.999u)

 

(a) 13.5g                 (b) 6.75g                 (c) 12.0g                 (d) 25.5g                 (e) 50.0g

 

6) A compound was analyzed and found to contain 43.18% K, 39.15% Cl and 17.67% O.

The empirical formula of the compound is:

 

(a) K2ClO2                          (b) KCl2O3                          (c) KClO            (d) KClO2                          (e) KClO3

 

7) A 100g sample of pure NaCl contains:

 

(a) 58.44 formula units NaCl

(b) 1.711 formula units NaCl

(c) 1.030 x 1024 formula unit NaCl

(d) 3.519 x 1025 formula unit NaCl

(e) 2.061 x 1024 formula unit NaCl

 

8) The number of microseconds in a 50.0 minute lecture is:

 

(a) 3 x 1012                             (b) 3.0 x 1012          (c) 5.0 x 109                           

(d) 3.00 x 109          (e) 3.0 x 109

 

9) The total members of neutrons, protons and electorns in 118Sn2+  are

 

(a) 118 neutron, 50 protons, 48e-

(b) 68 neutrons, 50 protons, 48e-

(c) 50 neutrons, 68 protons, 66e-

(d) 68 neutrons, 50 protons, 52e-

(e) 68 neutrons, 68 protons, 68e-

 

10) In the following Redox reaction

302 + C2H4 ® 2CO2 + 2H2O

 

(a) C2H4 is the oxidizing agent

(b) O2 is the reducing agent

(c) C2H4 is reduced

(d) The oxidation number of C in CO2 is +2

(e) None of the above

 

11) An oxide of iron has the formula Fe3O4 what mass percent of iron does it contain?

 

(a) 0.72%                 (b) 28%                    (c) 30%                    (d) 70%                    (e) 72%

 

12) The name for NCl3 is

 

(a) Nitrogen chloride

(b) Mono nitorogen chloride

(c) Chlorine nitride

(d) Nitrogen trichloride

(e) None of these

 

13) For the following reaction:

CaO + 2HClO3 ® Ca(ClO3)2 + H2O

If 12.5g of CaO (MW = 56.0g/mol) reacted with 75.0g of HClO3 (MW = 100g/mol). How many grames of Ca(ClO3)2 (MW = 239g/mol) will be formed?

 

(a) 107g                  (b) 100g                  (c) 77.5g                 (d) 53.3g                 (e) 89.6g

 

14) The oxidation number of oxygen in H2O, H2O2 and OF2 are:

 

(a) -2, -2, -2                            (b) -2, -1, -2                            (c) -2, -1, +2

(d) -2, -2, -1                            (e) -2, -1, -1

 

15) Calculate the final concentration if 2.0 L of 3.0 M NaCl is mixed with 4.0 L of 1.5M NaCl                         

 

(a) 3.8 M                                 (b) 2.0 M                                 (c) 1.0 M                                

(d) 0.25                                   (e) None of these

 

16) The molecular formula of perchloric acid is:

 

(a) HCl     (b) HClO4                 (c) HClO2                 (d) HClO3

 

17) The element Si is

 

(a) Nonmetal                               (b) Metal                             (c) Metalloid                           

(d)Post transition metal            (e) Halogen

 

18) Given the following equation

Zn + 2HCl ® ZnCl2 + 2H2

What volume of 0.470M HCl is required to produce 1.50g ZnCl2? (molar mass of ZnCl2 = 136g/mol)

 

(a) 10.3 ml                               (b) 11.7 ml                               (c) 29.2 ml                              

(d) 25.3 ml                                               (e) None of these

 

19) What is the molar mass of Ca3(PO4)2

 

(a) 310.18g               (b) 87.05g               (c) 135.05g               (d) 118.02g         (e) 166.02g

 

20) The empirical formula of a group of compounds is CHCl. Lindane, a powerful insecticide, is a member of this group. The molar mass of lindane is 290.8. How many atoms of carbon does a molecule of lindane contain?

 

(a) 2                        (b) 3                        (c) 4                        (d) 6                        (e) 8

 

 

Test 2

 

1)       Which of the following is soluble in water?

(a) MgSO4 ZnO        (b) AgI                     (c)                 (d) CaCO3                               (e) PbSO4

 

2)       The net ionic equation of    SnCl2 + 2NaOH  → Sn(OH)2 + 2NaCl   is:

(One)          2Cl- + 2Na+  → 2NaCl

(Two)          Sn2+ + 2Cl- → SnCl2

(Three)      Sn2+ +[SE1]  2OH- → Sn(OH)2

(Four)         2Na+ + 2OH- → 2NaOH

(Five)          None of the above

 

3)       In the following redox reaction  Cl2 + S2O32- → Cl- + SO42- (acidic soln.) the coefficients of Cl2 and SO42- in the balanced equation are respectively: 

(One)          1 and 10

(Two)          5 and 8

(Three)      4 and 2

(Four)         4 and 8

(Five)          3 and 5

 

4)       How many milliliters of 0.250 M  AlCl3 are required to react completely with 300 ml of 0.150 M  AgNO3 according to equation Ag+ + Cl- → AgCl(s)

(a) 180                    (b) 60                      (c) 90                      (d) 45                      (e) 20

 

5)       Which of the following properties in NOT a state function?

(a) enthalpy                            (b) work                  (c) pressure           

(d) temperature     (e) volume

 

6)       How many grams of KMnO4 are needed to prepare 500 ml of 0.100 N solution if the solution will be used in a reaction in which Mn is reduced to Mn2+ ? (M.W of KMnO4 = 158)

(a) 7.90g (b) 158g  (c) 3.95g (d) 1.58g (e) None of the above

 

7)       The energies of the given subshells vary in the following order

(a) 4d  <  4f <  5p <  6s

(b) 4d <  5p <  4f < 6s

(c) 4d <  5p <  6s < 4f

(d) 4f <  4d <  6s < 5p

(e) 4f <  6s <  5p < 4d

 

8)       The correct orbital diagram of molybdenum (Mo) is:

 

(a) [Kr]     ___                         ___          ___          ___          ___          ___

                  5s                                          4d

(b) [Kr]     ___                         ___          ___          ___          ___          ___

                  3s                                          4d

(c) [Kr]     ___                         ___          ___          ___          ___          ___

                  5s                                          6d

(d) [Kr]    ___                          ___          ___          ___          ___          ___

                 5s

(e) [Kr]    ___                          ___          ___          ___          ___          ___

                     5s                                       4d

 

9)       The sizes of the given species vary in the following order

(a) Cl- > Cl   >   Ne >  He

(b) Cl  > Cl-  >  Ne  > He

(c) He  > Ne  >  Cl-  > Cl

(d) Ne  > He  >  Cl  > Cl-

(e) Cl-  > Ne  >   Cl  > He

 

10)    Which of the following subshells DOES NOT exist?

(a) 5s                       (b) 3d                      (c) 1p                      (d) 4f                       (e) 3p

 

11)    The size of the following elements is NOT influenced by the lanthanide contraction

(a) Ag                      (b) Pt                       (c) Au                      (d) Hg                      (e) Bi

 

12)    The first ionisation energy of the given elements varies in the following order

(a) C  >  B  >  Be  >  Li

(b) Li >  Bi >  B   >  C

(c) Li >  B  >  Be  > C

(d) Li >  B  > C    >  Be

(e) C  >  Be > B   >  Li

 

13)    The electron affinity of the given elements varies in the following order.

(a) F  > Cl   > Br  >  I

(b) I   > Br  >  Cl  > F

(c) Cl > F   >  Br  > I

(d) Cl > Br >  I    >  F

(e) Br > Cl  > I    >  F

 

14)    The energy of a photon with frequenty 5.67 x 1015 sec-1 is (Planck’s constant  6.63 x 10-34 Js)

(One)          3.51 x 10-14 J

(Two)          9.11 x 10-19 J

(Three)      1.28 x 10-18 J

(Four)         3.76 x 10-18 J

(Five)          2.66 x 1017 J

 

15)     An electron emits light and goes from the n = 3 to the n = 1 level in a hydrogen atom. What is the frequency of the emitted light? (A = 2.18 x 10-18 J)

(a) 2.42 x 10-19       s-1

(b) 1.98 x 10-18       s-1

(c) 2.18 x 10-18       s-1

(d) 2.92 x 1015        s-1

(e) 3.66 x 1014        s-1

 

16)    What is a possible set of quantum numbers for a 3d electron?

(One)          n = 3,  l = 2,  ml = 3,  ms = ˝

(Two)          n = 3,  l = 2,  ml = 1,  ms = ˝

(Three)      n = 3,  l = 3,  ml = 1,  ms = ˝

(Four)         n = 4,  l = 2,  ml = 0,  ms = ˝

(Five)          n = 3,  l = 2,  ml = 1,  ms = 0

 

17)    Which of the following atoms is paramagnetic?

(a) Mg                      (b) Ne                      (c) Be                      (d) Zn                      (e) S

 

18)    The specific heats of lead, copper, iron and aluminium are 0.128, 0.385, 0.449 and 0.903 J g-1 oC-1 respectively. If identical pieces of each metal are given the same amount of heat which metal would have the highest temperature?

(a) Al                        (b) Cu                      (c) Fe                      (d) Pb

(e) all metals would have the same temperature

 

19)    Use the equations

H2(g) + ˝O2(g)  →  H2O(l)                                                        ∆H = - 285.8 KJ

C3H4(g) + 4O2(g)  →  3CO2(g) + 2H2O(l)                                   ∆H = - 1937 KJ

C3H8(g) + 5O2(g)  →   3CO2(g) + 4H2O(l)                                  ∆H = - 2219.1 KJ

 

To calculate ∆H for the reaction

C3H4(g) + 2H2(g)  →   C3H8(g)

(a) – 289.5 KJ                          (b) + 289.5 KJ                         (c) – 4441.9 KJ                       

(d) – 3.7 KJ                              (e) + 3.7 KJ

 

20)    Given the standard heats of formation (∆Hfo) for CH4(g) = - 74.9 KJ, CCl4(l) = - 134 KJ and HCl (g) = - 92.5 KJ. Calculate ∆Ho for the following reaction.

CH4(g) + 4Cl2(g)  →  CCl4(l) + 4HCl

 

(a) – 151.6 KJ                          (b) - 429.1 KJ                          (c) + 151.6 KJ

(d) + 429.1 KJ                         (e) None of the above

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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