NTE Praxis: Chemistry MCQs (Practice-Test 19 of 31)
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What are the geometric shape and the oxidation number of the copper atom, respectively, for the complex ion, [Cu (NH3) 4 (OH2) 2]2 +?
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tetrahedral; + 2
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square planar; 2
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octahedral; + 2
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linear; + 3
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trigonal planar; + 1
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Consider the experimental data below for compounds 1 and 2 which have the same molecular formula, C2H6O, compoundboiling point, oCfreezing point, oC 178.5 − 117.3 & 2 − 25.0 − 138.5
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Which of the following statements is TRUE?
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Compounds 1 and 2 are not isomers.
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Compounds 1 and 2 are optical isomers.
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Compounds 1 and 2 have identical physical properties.
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All of the above are TRUE.
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None of these is TRUE.
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What are the oxidation number (ON) and coordination number (CN) in the coordination compound, [Cu (en) (NH3) 2]Cl2 (Be careful.)?
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ON = 1, CN = 1
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ON = 1, CN = 2
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ON = 2, CN = 2
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ON = 2, CN = 3
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ON = 2, CN = 4
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Which one of the following is the correct electron configuration for the Fe3 + ion?
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[Ar] 4s1 3d5
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[Ar] 4s2 3d3
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[Ar] 4s1 3d4
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[Ar] 3d6
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[Ar] 3d5
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Which one of the following best explains why water is a monodentate ligand?
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The oxygen atom in a water molecule only has one lone pair of electrons that it can use to form a coordinate covalent bond to a metal atom.
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Each hydrogen atom in a water molecule has only one electron with which to form a coordinate covalent bond to a metal atom.
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The oxygen atom in a water molecule has two lone pairs of electrons, but both pairs are used to form a single coordinate covalent bond to a metal atom.
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The oxygen atom in a water molecule has two lone pairs of electrons, but the second lone pair is not close enough to a second coordination site to form a coordinate covalent bond.
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None of these.
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What are the coordination number and the oxidation state, respectively, of the cobalt atom in the compound [Co (NH3) 5Cl]Cl2?
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4; + 2
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4; + 3
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5; + 2
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6; + 2
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6; + 3
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“Cobalt Yellow” is a pigment used in oil paints, and contains the coordination compound K3[Co (NO2) 6]. How many unpaired electrons are there on the cobalt atom in this compound? Note that NO2-is a strong-field ligand.
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0
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1
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2
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3
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4
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When a concentrated solution of NH3 is added to a solution containing Zn (NO3) 2, a colorless solution containing the complex ion Zn (NH3) 42 + results. Which one of the following best explains why this solution is colorless?
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The Zn atom does not have any 3d electrons; thus, an electron cannot be transferred between the split 3d orbitals.
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The Zn atom does not have any 4s electrons; thus, an electron cannot be transferred between the split 4s orbitals.
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The 3d orbitals on the Zn atom are completely filled; thus, an electron cannot be transferred between the split 3d orbitals.
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The Zn atom does not have any unpaired electrons which are necessary in order to transfer an electron between the split 3d orbitals.
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The Zn (NH3) 42 + ion only absorbs blue light which makes the solution colorless.
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When solid CoCl2 is dissolved in water, a pink solution results and the following equilibrium is established: Co (H2O) 62 + (aq) + 4 Cl- (aq) ⇔ CoCl42- (aq) + 6 H2O (l)
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In aqueous solution, the Co (H2O) 62 + ion is pink, and the CoCl42-ion is blue.
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The shape of Co (H2O) 62 + is octahedral whereas the shape of CoCl42-is tetrahedral.
Which one of the following best describes what will happen when a concentrated solution of HCl is added to the CoCl2 solution without changing the volume significantly?
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Because a solution of HCl is colorless, the color of the CoCl2 solution will not change.
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Because HCl is a strong acid, the number of unpaired electrons in Co (H2O) 62 +, but not CoCl42-, will change.
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The concentration of Co (H2O) 62 + will decrease and the concentration of CoCl42-will increase; the color of the solution will become more blue.
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The concentration of Co (H2O) 62 + will increase and the concentration of CoCl42-will decrease; the color of the solution will become more pink.
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The addition of HCl will have no effect on the position of the equilibrium.
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Which one of the following can form geometric isomers?
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[AgCl2]-
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[Cu (NH3) 4]2 + (square planar)
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[Co (OH2) 5Cl]2 +
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Ni (OH2) 2Br2 (square planar)
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None of these can form geometric isomers.
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Which of the following types of isomers can [Ag (NH3) 2] + form?
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Linkage Isomers
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Geometric Isomers
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Optical Isomers
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1 only
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1 and 2
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1 and 3
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3 only
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None of these.
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What color would we expect an aqueous solution containing Ti (OH2) 44 + to be?
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blue
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red
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green
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yellow
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colorless
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What is the oxidation number of platinum in the coordination compound, Pt (NH3) 2Cl2?
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-2
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-1
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0
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+ 1
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+ 2
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For the coordination compound, Na2[Cd (en) (CN) 4], what are the coordination number (CN) and oxidation number (O. N.) of the central metal ion (Note: The letters, en, represent the ligand, ethylenediamine.).
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CN = 6, ON = + 2.
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CN = 5, ON = + 2.
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CN = 4, ON = + 3.
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CN = 4, ON = + 2.
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CN = 3, ON = + 1.
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