NET, IAS, State-SET (KSET, WBSET, MPSET, etc.), GATE, CUET, Olympiads etc.: 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 + ?
- tetrahedral; + 2
- square planar; 2
- octahedral; + 2
- linear; + 3
- trigonal planar; + 1
- 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
- Which of the following statements is TRUE?
- Compounds 1 and 2 are not isomers.
- Compounds 1 and 2 are optical isomers.
- Compounds 1 and 2 have identical physical properties.
- All of the above are TRUE.
- None of these is TRUE.
- What are the oxidation number (ON) and coordination number (CN) in the coordination compound, [Cu (en) (NH3) 2] Cl2 (Be careful.) ?
- ON = 1, CN = 1
- ON = 1, CN = 2
- ON = 2, CN = 2
- ON = 2, CN = 3
- ON = 2, CN = 4
- Which one of the following is the correct electron configuration for the Fe3 + ion?
- [Ar] 4s1 3d5
- [Ar] 4s2 3d3
- [Ar] 4s1 3d4
- [Ar] 3d6
- [Ar] 3d5
- Which one of the following best explains why water is a monodentate ligand?
- 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.
- Each hydrogen atom in a water molecule has only one electron with which to form a coordinate covalent bond to a metal atom.
- 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.
- 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.
- None of these.
- What are the coordination number and the oxidation state, respectively, of the cobalt atom in the compound [Co (NH3) 5Cl] Cl2?
- 4; + 2
- 4; + 3
- 5; + 2
- 6; + 2
- 6; + 3
- “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.
- 0
- 1
- 2
- 3
- 4
- 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?
- The Zn atom does not have any 3d electrons; thus, an electron cannot be transferred between the split 3d orbitals.
- The Zn atom does not have any 4s electrons; thus, an electron cannot be transferred between the split 4s orbitals.
- The 3d orbitals on the Zn atom are completely filled; thus, an electron cannot be transferred between the split 3d orbitals.
- The Zn atom does not have any unpaired electrons which are necessary in order to transfer an electron between the split 3d orbitals.
- The Zn (NH3) 42 + ion only absorbs blue light which makes the solution colorless.
- 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)
- In aqueous solution, the Co (H2O) 62 + ion is pink, and the CoCl42-ion is blue.
- 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?
- Because a solution of HCl is colorless, the color of the CoCl2 solution will not change.
- Because HCl is a strong acid, the number of unpaired electrons in Co (H2O) 62 + , but not CoCl42-, will change.
- The concentration of Co (H2O) 62 + will decrease and the concentration of CoCl42-will increase; the color of the solution will become more blue.
- The concentration of Co (H2O) 62 + will increase and the concentration of CoCl42-will decrease; the color of the solution will become more pink.
- The addition of HCl will have no effect on the position of the equilibrium.
- Which one of the following can form geometric isomers?
- [AgCl2] -
- [Cu (NH3) 4] 2 + (square planar)
- [Co (OH2) 5Cl] 2 +
- Ni (OH2) 2Br2 (square planar)
- None of these can form geometric isomers.
- Which of the following types of isomers can [Ag (NH3) 2] + form?
- Linkage Isomers
- Geometric Isomers
- Optical Isomers
- 1 only
- 1 and 2
- 1 and 3
- 3 only
- None of these.
- What color would we expect an aqueous solution containing Ti (OH2) 44 + to be?
- blue
- red
- green
- yellow
- colorless
- What is the oxidation number of platinum in the coordination compound, Pt (NH3) 2Cl2?
- -2
- -1
- 0
- + 1
- + 2
- 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.) .
- CN = 6, ON =+ 2.
- CN = 5, ON =+ 2.
- CN = 4, ON =+ 3.
- CN = 4, ON =+ 2.
- CN = 3, ON =+ 1.