Chemistry
Grade-8
Easy
Question
Calcium carbonate occurs in nature in the form of:
- Marble
- Limestone
- Calcite
- All of these
Hint:
It is used for as a flooring material, to make chalk, used in textile, pain and paper industries.
The correct answer is: All of these
The correct option is d)All of these.
Calcium carbonate, or CaCO3, makes up over 4% of the earth's crust and is found worldwide. Its most common natural forms are chalk, limestone and marble formed by the deposition of tiny fossilized snail, crustacean and coral shells over millions of years. The chemical name of marble is calcium carbonate. It is a non-foliate metamorphic rock composed of recrystallized carbonate minerals, most commonly calcite or dolomite.
Related Questions to study
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
Chemistry
Identify the pair of organic compounds from the following?
Identify the pair of organic compounds from the following?
ChemistryGrade-8
Chemistry
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.
ChemistryGrade-8
Chemistry
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
Chemistry
Match the entries of Column A with those of Column B.
Match the entries of Column A with those of Column B.
ChemistryGrade-8
Chemistry
When carbon dioxide reacts with sodium oxides, it gives ____
When carbon dioxide reacts with sodium oxides, it gives ____
ChemistryGrade-8
Chemistry
What are the products obtained from the following chemical reaction?
What are the products obtained from the following chemical reaction?
ChemistryGrade-8
Chemistry
Which of the following fertilizer is manufactured by using carbon dioxide?
Which of the following fertilizer is manufactured by using carbon dioxide?
ChemistryGrade-8
Chemistry
CaCO3 is the chemical formula for
CaCO3 is the chemical formula for
ChemistryGrade-8
Chemistry
When liquid CO2 is cooled at –78oC, it changes into snow-white compound called as
When liquid CO2 is cooled at –78oC, it changes into snow-white compound called as
ChemistryGrade-8
Chemistry
Which of the carbonates does not decompose to give carbon dioxide?
Which of the carbonates does not decompose to give carbon dioxide?
ChemistryGrade-8
Chemistry
Multiple True (T) – False (F) type of Question:
1. Most of the food contain compounds of carbon and oxygen.
2. Carbon monoxide is neither combustible nor a supporter of combustion.
3. Dry ice produces at a very low temperature.
Multiple True (T) – False (F) type of Question:
1. Most of the food contain compounds of carbon and oxygen.
2. Carbon monoxide is neither combustible nor a supporter of combustion.
3. Dry ice produces at a very low temperature.
ChemistryGrade-8
Chemistry
Which of the following statement is incorrect?
Which of the following statement is incorrect?
ChemistryGrade-8
Chemistry
In the laboratory preparation of carbon dioxide, the gas is collected by upward displacement of air because:
In the laboratory preparation of carbon dioxide, the gas is collected by upward displacement of air because:
ChemistryGrade-8
