Construct a unit test sample (10 multiple choice questions and 5 long answer questions) with solutions on the Unit inorganic chemistry
Multiple Choice Questions:
1. Which of the following is an example of an inorganic compound?
a) Glucose
b) Methane
c) Ammonium sulfate
d) Ascorbic acid
2. What is the valency of nitrogen in ammonia (NH3)?
a) 1
b) 2
c) 3
d) 4
3. Which of the following is true about ionic compounds?
a) They consist of molecules held together by covalent bonds
b) They consist of charged ions held by metallic bonds
c) They conduct electricity in solid state
d) They have low melting and boiling points
4. Which of the following is a property of metals?
a) They tend to gain electrons in chemical reactions
b) They are good conductors of heat and electricity
c) They are brittle and easily breakable
d) They have low melting and boiling points
5. Which of the following is an example of a coordination compound?
a) Sodium chloride
b) Ethanol
c) Potassium cyanide
d) Copper sulfate
6. What is the chemical formula for calcium carbonate?
a) CaCO
b) CaCO2
c) Ca2CO3
d) CaCO3
7. Which of the following is a characteristic of transition metals?
a) They have a full d orbital
b) They generally form ionic compounds
c) They exhibit variable oxidation states
d) They are highly reactive
8. Which of the following is an example of a noble gas?
a) Neon
b) Fluorine
c) Oxygen
d) Sulphur
9. What is the formula for aluminum oxide?
a) Al2O
b) AlO
c) Al2O3
d) AlO3
10. Which of the following is a property of acids?
a) They turn blue litmus paper red
b) They have a pH above 7
c) They taste sweet
d) They are good conductors of electricity
Long Answer Questions:
1. Define oxidation and reduction. Provide an example of a redox reaction.
2. Explain the concept of Lewis acids and bases with suitable examples.
3. Describe the structure and bonding in diamond and graphite.
4. Discuss the properties and uses of hydrogen peroxide.
5. Explain the concept of ligands in coordination compounds. Give an example of a complex ion and its coordination number.
Solution:
Multiple Choice Questions:
1. c) Ammonium sulfate
2. c) 3
3. c) They conduct electricity in solid state
4. b) They are good conductors of heat and electricity
5. d) Copper sulfate
6. d) CaCO3
7. c) They exhibit variable oxidation states
8. a) Neon
9. c) Al2O3
10. a) They turn blue litmus paper red
Long Answer Questions:
1. Oxidation is the loss of electrons, while reduction is the gain of electrons in a chemical reaction. Example of a redox reaction: 2Na + Cl2 -> 2NaCl
2. Lewis acids are electron pair acceptors, while Lewis bases are electron pair donors. An example is BF3 acting as a Lewis acid and NH3 acting as a Lewis base to form the adduct BF3.NH3.
3. Diamond and graphite are both allotropes of carbon. Diamond has a three-dimensional network structure with strong covalent bonds, while graphite consists of layered sheets of carbon atoms with weak van der Waals forces between the layers.
4. Hydrogen peroxide is a pale blue liquid with strong oxidizing properties. It is used as a bleach, disinfectant, and oxidizer in various industrial processes.
5. Ligands are molecules or ions that donate a pair of electrons to form a coordinate bond with a central metal ion. An example is the complex ion [Cu(NH3)4]2+, where ammonia (NH3) acts as a ligand and the coordination number of copper is 4.