Chemistry
Grade-8
Easy
Question
One of the important constituents of producer gas is :
- Carbon monoxide
- Calcium carbonate
- Calcium carbide
- Carbon dioxide
Hint:
It is a color less, odorless and toxic gas.
The correct answer is: Carbon monoxide
The correct option is a)Carbon monoxide.
Producer gas is the product formed when coal or coke is burned under conditions of air deficiency and controlled humidity. The production gas is a mixed gas containing carbon monoxide, hydrogen, carbon dioxide and nitrogen. Producer gas is the substance produced when biomass is burned in the absence of air and a controlled amount of moisture.
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Carbon monoxide combines with blood's hemoglobin to form a compound called as _____
Carbon monoxide combines with blood's hemoglobin to form a compound called as _____
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To detect the bicarbonate present in any given sample, sample is heated. Which of the following gas is released during this reaction is used to detect bicarbonates?
To detect the bicarbonate present in any given sample, sample is heated. Which of the following gas is released during this reaction is used to detect bicarbonates?
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The compound of carbon used to soften hard water is _______.
The compound of carbon used to soften hard water is _______.
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Which of the following gas is poisonous in nature?
Which of the following gas is poisonous in nature?
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Which of the following compound is result of incomplete combustion of fuels?
Which of the following compound is result of incomplete combustion of fuels?
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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?
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
ChemistryGrade-8
