Chemistry
Grade-8
Easy
Question
Which is the hardest allotrope of carbon?
- Charcoal
- Graphite
- Diamond
- Fullerene
Hint:
Used to make ornaments.
The correct answer is: Diamond
The correct option is c)Diamond.
Diamond is the hardest allotrope of carbon. It has a crystal lattice.
This structure has space, creating a rigid three-dimensional network of carbon atoms with directed covalent bonds throughout the lattice.
Extensive covalent bonds are very difficult to break, making diamond the hardest substance on earth.
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The melting point of sodium bicarbonate is:
The melting point of sodium bicarbonate is:
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Which of the following compound is insoluble in water?
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Read the following paragraph carefully.
Carbon monoxide combines with blood's haemoglobin to form a compound called ____ X
This compound does not allow haemoglobin to ____ Y oxygen, thus depriving our body cells of oxygen. This causes paralysis of respiratory organs and results in death due to suffocation. This makes CO gas a highly _____ Z one.
Identify the compounds X, Y and Z in the above paragraph:
Read the following paragraph carefully.
Carbon monoxide combines with blood's haemoglobin to form a compound called ____ X
This compound does not allow haemoglobin to ____ Y oxygen, thus depriving our body cells of oxygen. This causes paralysis of respiratory organs and results in death due to suffocation. This makes CO gas a highly _____ Z one.
Identify the compounds X, Y and Z in the above paragraph:
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Which of the following picture does not depicts uses of calcium carbonate?
Which of the following picture does not depicts uses of calcium carbonate?
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Match the column A with Column B .
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The product obtained by heating calcium oxide and coke is:
The product obtained by heating calcium oxide and coke is:
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Complete the following analogy:
Calcium carbide: ripening agent: Carbon monoxide:
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Calcium carbide: ripening agent: Carbon monoxide:
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When CO gas is passed over the finely divided metals, like, iron, which of the following product is obtained?
When CO gas is passed over the finely divided metals, like, iron, which of the following product is obtained?
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What is the common name for the sodium carbonate?
What is the common name for the sodium carbonate?
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The element present in the molecular formula of calcium carbonate is/are:
The element present in the molecular formula of calcium carbonate is/are:
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Calcium carbonate reacts with strong acids like hydrochloric acid to form:
Calcium carbonate reacts with strong acids like hydrochloric acid to form:
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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.
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.
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Which of the following statement is incorrect?
Which of the following statement is incorrect?
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What are the product A and B in the following reaction:
What are the product A and B in the following reaction:
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One of the important constituents of producer gas is :
One of the important constituents of producer gas is :
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