Chemistry
Grade-8
Easy
Question
Identify the pollution-free fuel from the list of fuels given below.
- Hydrocarbon
- Coal
- Biomass
- Hydrogen
Hint:
Hydrogen can be used instead of fossil fuels in combustion engines.
The correct answer is: Hydrogen
Hydrogen can be used instead of fossil fuels in combustion engines. Hydrogen cars give out no harmful tailpipe emissions, only water. Hydrogen fuel cells are an environmentally friendly technology that converts hydrogen into electricity through an electrochemical process that emits only water and heat and by products.
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Catalytic hydrogenation takes place in the presence of______.
Catalytic hydrogenation takes place in the presence of______.
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For the given reaction, match column I with column II and mark the correct option from the codes given below.
| Column A |
Column B |
| (a) Oxidizing agent |
(i) H2 |
| (b) Reducing agent |
(ii) 4 |
| (c) x |
(iii) 3 |
| (d) y |
(iv) Fe3O4 |
For the given reaction, match column I with column II and mark the correct option from the codes given below.
| Column A |
Column B |
| (a) Oxidizing agent |
(i) H2 |
| (b) Reducing agent |
(ii) 4 |
| (c) x |
(iii) 3 |
| (d) y |
(iv) Fe3O4 |
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The type of reaction which is not a redox reaction is
The type of reaction which is not a redox reaction is
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During the redox reaction, the reducing agent itself gets _______ during the reaction.
During the redox reaction, the reducing agent itself gets _______ during the reaction.
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Given below are two statements labeled as Assertion (A) and Reason (R).
Assertion(A): Hydrogen at present cannot be used as fuel on a large scale.
Reason(R): Storage of hydrogen is dangerous as it is a light gas that is very explosive.
Select the most appropriate answer from the options given below:
Given below are two statements labeled as Assertion (A) and Reason (R).
Assertion(A): Hydrogen at present cannot be used as fuel on a large scale.
Reason(R): Storage of hydrogen is dangerous as it is a light gas that is very explosive.
Select the most appropriate answer from the options given below:
ChemistryGrade-8
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Why did helium replace hydrogen in weather observation balloons?
(i) It forms a mixture of air that can explode.
(ii) It is heavier than hydrogen.
(iii) It is very expensive to use hydrogen gas in balloons.
Why did helium replace hydrogen in weather observation balloons?
(i) It forms a mixture of air that can explode.
(ii) It is heavier than hydrogen.
(iii) It is very expensive to use hydrogen gas in balloons.
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Identify the redox reaction from the following chemical reactions.
(i) 
(ii) 
(iii) 
(iv) 
Options:
Identify the redox reaction from the following chemical reactions.
(i)
(ii)
(iii)
(iv)
Options:
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In the chemical reaction below, find out the compound which acts as a reducing agent.
In the chemical reaction below, find out the compound which acts as a reducing agent.
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Out of the following, which fuel contains the largest percentage of hydrogen?
Out of the following, which fuel contains the largest percentage of hydrogen?
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Identify the oxidizing agent from the following:
Identify the oxidizing agent from the following:
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The substance which supplies hydrogen during the oxidation-reduction reaction is called
The substance which supplies hydrogen during the oxidation-reduction reaction is called
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Reduction is a process that involves
Reduction is a process that involves
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The process in which hydrogen is removed from the substance is known as _____.
The process in which hydrogen is removed from the substance is known as _____.
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Which of the following application does not represent the uses of hydrogen?
Which of the following application does not represent the uses of hydrogen?
ChemistryGrade-8
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The mixture of hydrogen and oxygen, when burnt together, gives a flame known as ________.
The mixture of hydrogen and oxygen, when burnt together, gives a flame known as ________.
ChemistryGrade-8
