CO is a colourless, odourless gas that, when inhaled in excessive volumes, can be dangerous. When anything is burned, CO is released. Cars, trucks, and other fossil-fuel-burning vehicles and machinery emit the most CO into the atmosphere. CO can be released by a variety of objects in your home, including unvented kerosene and gas space heaters, leaking chimneys and furnaces, and gas stoves.
| Definition: In carbon monoxide, one carbon atom and one oxygen atom are connected by a triple bond. It is the oxocarbon family’s most basic chemical. |
Carbon Monoxide Chemistry Questions with Solutions
Q-1: Water gas is the mixture of CO+H2 in the ratio of
- 2:1
- 1:1
- 1:2
- 2:2
Answer: b) 1:1
Explanation: Steam is passed over a red-hot carbon fuel like coke to produce gas:
C(s)+ H2O(g) →CO(g) + H2(g)
Q-2: Match the column I with column II
| Column I | Column II |
|---|---|
| A) CO+ N2 | i) Semi water gas |
| B) CH4 + H2+ CO | ii) Neutral gas |
| C) CO+ N2 + H2 | iii) SynGas |
| D) CO | iv)Producer gas |
| E) CO + H2 | v)Coal gas |
Answer: A)-iv, B)-v), C)-i) ,D)-ii), E)-iii)
Q-3: Carbon monoxide poisoning is treated with which type of therapy?
- Chemotherapy
- Physiotherapy
- Hyperbaric oxygen therapy
- Radiation Therapy
Answer: c) Hyperbaric oxygen therapy
Explanation: Hyperbaric oxygen therapy (HBOT) is a method of treatment for carbon monoxide poisoning, non-healing wounds, and infections caused by a lack of oxygen in the tissues. It aids in the protection of heart and brain tissue, which are especially vulnerable to carbon monoxide poisoning.
Q-4: What are the most prevalent symptoms of CO poisoning?
Answer: Carbon monoxide poisoning can happen suddenly or gradually. CO poisoning begins with flu-like symptoms, such as headaches, nausea, and exhaustion. The effects get more severe as the exposure time or CO concentration increases, manifesting as tiredness and confusion. Brain damage and death can result from prolonged exposure.
Q-5: Carbon monoxide is used in the preparation of
- Ethyl alcohol
- Methyl alcohol
- Propyl alcohol
- Propane
Answer: b) Methyl alcohol
Explanation: Synthetically, methanol can be made by heating carbon monoxide and hydrogen gases under pressure in the presence of a catalyst. The reaction is
CO(g)+2H2(g) → CH3OH(l)
ZnO and Cr2O3 are used as catalysts in this process, which yields methanol with a high selectivity.
Q-6: Carbon monoxide reacts with haemoglobin to form
- Carb Haemoglobin
- Carbaminohaemoglobin
- Carboxyhaemoglobin
- Deoxy Haemoglobin
Answer: c) Carboxyhemoglobin
Explanation: CO binds to blood haemoglobin and lowers blood oxygen transport efficiency. When CO reacts with haemoglobin, carboxyhaemoglobin(COHb) is generated.
Q-7: Fill in the blanks
- Carbon monoxide has a ________fold affinity for haemoglobin compared to oxygen.
- _______blood contains less than 1 % COHb, while ______blood contains up to 10%.
- A high concentration of CO in blood causes tissue ________.
- _______ gases contain between 4% and 7% CO.
- COHb has a_________ colour.
Answer: a) 200-300
b) normal, smokers
c) anoxia
d) Car exhaust
e) Cherry red
Q-8: The hybridisation of carbon in CO and molecular geometry of CO is
- sp2, linear
- sp2, trigonal planar
- sp, linear
- sp, non linear
Answer: c) sp, linear
Explanation: – The steric number of a particular atom can be used to determine the hybridisation of that atom in a molecule.
We can write, SN = (number of electron lone pairs) + (number of sigma bonds formed by the atom)
The structure of carbon monoxide molecule is:
From the structure it can be concluded that,
- Number of electron pairs on carbon =1
- Number of sigma bonds formed by carbon = 1
SN of carbon atom = 1+1=2
According to VSEPR theory, a steric number equal to 2 corresponds to hybridisation “sp” and the molecular geometry of the molecule as linear.
Q-9: Does carbon monoxide produce long term ecological damage?
Answer: Carbon monoxide is not bioaccumulative or persistent. Carbon monoxide, unlike ozone or sulphur dioxide, does not cause long-term environmental harm.
Q-10: Where should you put the CO detector in your home?
Answer: Carbon monoxide detectors can be fitted in homes to alert residents to dangerous CO levels. These detectors should be placed outside bedrooms in hallways so that they can be heard while people are sleeping. It is essential to exit the house as soon as the alarm sounds.
Q-11: What role does CO play in nickel refining?
Answer: Ni is purified by Mond’s process. Impure nickel is heated in a steam of carbon monoxide forming a volatile complex, nickel tetracarbonyl, which is decomposed when heated at 450K to give pure nickel metal.
The following reaction takes place:
Q-12: When zinc oxide is reduced by coke, what gas is produced?
- Carbon dioxide
- Carbon monoxide
- Oxygen
- Ozone
Answer: b) Carbon monoxide
Explanation: The following reaction takes place:
Q-13: Calculate the molar mass of Carbon monoxide.
Answer: A molecule’s molar mass is the sum of the atomic masses of its constituent atoms.
Molar mass of carbon monoxide = Atomic mass of C + Atomic mass of O= (12+16) u = 28 u
Q-14: What is a ligand? Is CO a neutral ligand?
Answer: Ligands are the atoms, ions, and molecules that surround the core transition metal ion. They serve as a Lewis base, donating electron pairs to the transition metal ion, forming a dative link between the ligands and the transition metal ion.
Yes, Co is considered a neutral ligand.
Q-15: When designating coordination compounds according to IUPAC, what is the special term for CO?
- Carboxyl
- Carbonyl
- Carbonic
- Carboxylate
Answer: b) Carbonyl
Practise Questions on Carbon monoxide
Q-1: How can carbon monoxide impact pregnant women?
Q-2: Humans are poisoned by carbon monoxide. How?
Q-3: The bond order of CO gas is
- 1
- 2
- 3
- 2.5
Q-4: What effect does CO have on the AQI?
Q-5: Wrought iron is the purest form of iron. It is obtained when carbon gets oxidised to CO by
- Haematite
- Magnetite
- Siderite
- Limonite
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