Chemistry
Grade-8
Easy
Question
Which of the following compound is result of incomplete combustion of fuels?
- Calcium carbide
- Carbon monoxide
- Carbon tetrachloride
- Sulphur trioxide
Hint:
The formula is CO.
The correct answer is: Carbon monoxide
The correct option is b)Carbon monoxide.
Incomplete combustion is generally caused by poor air-fuel mixing, insufficient residence time, insufficient temperature, and low total excess air. Carbon monoxide is a colorless, highly toxic, odorless and tasteless combustible gas that is slightly less dense than air. Carbon monoxide has a carbon atom and an oxygen atom connected by a triple bond.
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The main component found in chalk and marble is.
The main component found in chalk and marble is.
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Carbon monoxide is combustible and burns with _______ flame.
Carbon monoxide is combustible and burns with _______ flame.
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What is the compound A in the following chemical reaction?
What is the compound A in the following chemical reaction?
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Which among the following does not produce carbon monoxide?
Which among the following does not produce carbon monoxide?
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Calcium carbonate occurs in nature in the form of:
Calcium carbonate occurs in nature in the form of:
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The compound which is used as a grinding stone to cut and sharpen tools is:
The correct option is c)Silicon carbide.
Silicon carbide, an artificial compound of silicon and carbon with a Mohs hardness of 9.5, is commonly used to cut softer gemstones. It is also used as a grinding stone to cut and even to sharpen tools. Diamond, the hardest natural substance, has a Mohs hardness of 10 and is used as an abrasive for cutting and polishing a variety of materials, including diamond itself.
The compound which is used as a grinding stone to cut and sharpen tools is:
ChemistryGrade-8
The correct option is c)Silicon carbide.
Silicon carbide, an artificial compound of silicon and carbon with a Mohs hardness of 9.5, is commonly used to cut softer gemstones. It is also used as a grinding stone to cut and even to sharpen tools. Diamond, the hardest natural substance, has a Mohs hardness of 10 and is used as an abrasive for cutting and polishing a variety of materials, including diamond itself.
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Carbon dioxide dissolves in water to give___
Carbon dioxide dissolves in water to give___
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Identify the pair of organic compounds from the following?
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Assertion-Reason Type Questions
Assertion (A): CO2 is used in fire extinguishers to put off fires.
Reason (R): It is a non-combustible gas and supports combustion.
Assertion-Reason Type Questions
Assertion (A): CO2 is used in fire extinguishers to put off fires.
Reason (R): It is a non-combustible gas and supports combustion.
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In the laboratory preparation of carbon monoxide, hydrochloric acid is only used although sulfuric acid reacts with calcium carbonate in the same way as HCl. However, the sulfuric acid is never used because:
(i). Insoluble calcium sulfate formed during this reaction
(ii). Calcium sulfate covers the marble chips and stops the reaction.
(iii). The reaction is a highly exothermic reaction
(iv). To react both of the reactants, many temperature conditions need to be fulfilled
In the laboratory preparation of carbon monoxide, hydrochloric acid is only used although sulfuric acid reacts with calcium carbonate in the same way as HCl. However, the sulfuric acid is never used because:
(i). Insoluble calcium sulfate formed during this reaction
(ii). Calcium sulfate covers the marble chips and stops the reaction.
(iii). The reaction is a highly exothermic reaction
(iv). To react both of the reactants, many temperature conditions need to be fulfilled
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Match the entries of Column A with those of Column B.
Match the entries of Column A with those of Column B.
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When carbon dioxide reacts with sodium oxides, it gives ____
When carbon dioxide reacts with sodium oxides, it gives ____
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What are the products obtained from the following chemical reaction?
What are the products obtained from the following chemical reaction?
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Which of the following fertilizer is manufactured by using carbon dioxide?
Which of the following fertilizer is manufactured by using carbon dioxide?
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CaCO3 is the chemical formula for
CaCO3 is the chemical formula for
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