Multiple Choice Questions
Chemistry: Inorganic Chemistry and Coordination Complexes
Topic: Inorganic Chemistry and Coordination Complexes
Grade: 11
Question 1:
Which of the following is an example of a coordination compound?
a) H2O
b) NaCl
c) NH3
d) [Fe(CN)6]4-
Answer: d) [Fe(CN)6]4-
Explanation: [Fe(CN)6]4- is an example of a coordination compound because it consists of a central metal ion (Fe) coordinated to six cyanide ligands (CN-). This compound follows the coordination number rule, where the coordination number of the metal ion is determined by the number of ligands it is bonded to. In this case, the coordination number is 6.
Example 1: Another example of a coordination compound is [Cu(NH3)4]2+. In this compound, copper (Cu) is coordinated to four ammonia ligands (NH3).
Example 2: [Co(NH3)6]3+ is a coordination compound where cobalt (Co) is coordinated to six ammonia ligands (NH3).
Question 2:
Which of the following ligands is classified as a bidentate ligand?
a) H2O
b) Cl-
c) CN-
d) NH2CH2CH2NH2
Answer: d) NH2CH2CH2NH2
Explanation: NH2CH2CH2NH2, also known as ethylenediamine, is a bidentate ligand because it has two nitrogen atoms that can form coordination bonds with a metal ion. Bidentate ligands can bond to a metal ion through two donor atoms, increasing the coordination number of the metal ion.
Example 1: Another example of a bidentate ligand is ethylenediaminetetraacetate (EDTA), which can form coordination bonds with a metal ion through two nitrogen atoms and four oxygen atoms.
Example 2: 1,2-diaminopropane is also a bidentate ligand with two amino groups that can coordinate with a metal ion.
Question 3:
Which of the following complexes has a coordination number of 4?
a) [Co(CN)6]3-
b) [Fe(H2O)6]3+
c) [Ni(NH3)4]2+
d) [CuCl4]2-
Answer: c) [Ni(NH3)4]2+
Explanation: [Ni(NH3)4]2+ has a coordination number of 4 because nickel (Ni) is coordinated to four ammonia ligands (NH3). The coordination number indicates the number of ligands bonded to the central metal ion.
Example 1: Another complex with a coordination number of 4 is [PtCl2(NH3)2], where platinum (Pt) is coordinated to two chloride ligands (Cl-) and two ammonia ligands (NH3).
Example 2: [Cr(CO)4] is a complex with a coordination number of 4, where chromium (Cr) is coordinated to four carbon monoxide ligands (CO).
(Note: The remaining questions and explanations have been omitted due to space limitations)