Chemistry
Grade-8
Easy
Question
Multiple True false Statement:
(i) carbon dioxide is an important constituent of the fuels, like, coal gas, water gas.
(ii) Carbon monoxide is slightly lighter than air.
(iii) Calcium carbide is greyish black crystalline solid.
Hint:
i)The fuel is made up of carbon and hydrogen, which produce different substances when burned with air. The combustion process can be complete or incomplete.
ii) Co is present in warm updrafts and the detector should be atleast 5 feet above the ground.
iii) It is dirty colored solid.
The correct answer is:
The correct option is c)
Carbon monoxide is an important constituent of the fuels, like, coal gas, water gas and not carbon dioxide.
Carbon monoxide is slightly lighter than air and is present in warm updrafts, so the detector should be mounted on a wall about 5 feet from the floor. The detector can be mounted on the ceiling.
Calcium carbide, additionally referred to as calcium acetylide, is a chemical compound with the chemical formula of CaC₂. It is a greyish black color solid.
Related Questions to study
Chemistry
Which of the following statement is incorrect?
Which of the following statement is incorrect?
ChemistryGrade-8
Chemistry
What are the product A and B in the following reaction:
What are the product A and B in the following reaction:
ChemistryGrade-8
Chemistry
One of the important constituents of producer gas is :
One of the important constituents of producer gas is :
ChemistryGrade-8
Chemistry
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 _____
ChemistryGrade-8
Chemistry
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?
ChemistryGrade-8
Chemistry
The compound of carbon used to soften hard water is _______.
The compound of carbon used to soften hard water is _______.
ChemistryGrade-8
Chemistry
Which of the following gas is poisonous in nature?
Which of the following gas is poisonous in nature?
ChemistryGrade-8
Chemistry
Which of the following compound is result of incomplete combustion of fuels?
Which of the following compound is result of incomplete combustion of fuels?
ChemistryGrade-8
Chemistry
The main component found in chalk and marble is.
The main component found in chalk and marble is.
ChemistryGrade-8
Chemistry
Carbon monoxide is combustible and burns with _______ flame.
Carbon monoxide is combustible and burns with _______ flame.
ChemistryGrade-8
Chemistry
What is the compound A in the following chemical reaction?
What is the compound A in the following chemical reaction?
ChemistryGrade-8
Chemistry
Which among the following does not produce carbon monoxide?
Which among the following does not produce carbon monoxide?
ChemistryGrade-8
Chemistry
Calcium carbonate occurs in nature in the form of:
Calcium carbonate occurs in nature in the form of:
ChemistryGrade-8
Chemistry
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.
Chemistry
Carbon dioxide dissolves in water to give___
Carbon dioxide dissolves in water to give___
ChemistryGrade-8
