Chemistry
Grade-8
Easy
Question
Which of the following compound is insoluble in water?
- Sodium carbonate
- Sodium chloride
- Calcium oxide
- Calcium oxide
Hint:
The oxide of calcium.
The correct answer is: Calcium oxide
The correct option is d)calcium oxide.
It is an ionic solid with strong electrostatic attraction between Ca2+ and O2 ions. It is insoluble in water because it reacts with water to form Ca(OH)2 (unlike some metal oxides).
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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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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?
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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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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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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?
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