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When a silvery grey powder of a solid (A) is mixed with a powder of solid (B) no reaction occurs. But if the mixture is ignited and lighted using magnesium ribbon a reaction occurs with the evolution of a large amount of heat forming product (C) which settles down as liquid metal and the solid product (D) formed floats on the liquid (C). (C) in solid form reacts with moisture to form rust. The amount of heat generated during the reaction is so high that the reaction is used in welding of electric conductors, joints in railway tracks. Based on this information, answer the questions.
Identify A and C?
- a)A – Al and C – Fe
- b)A – Fe and C – Al
- c)A – Mg and C- Al
- d)A – Al and C - Cu
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
When a silvery grey powder of a solid (A) is mixed with a powder of s...
B = Fe2O3
C = Fe
D = Al2O3
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When a silvery grey powder of a solid (A) is mixed with a powder of s...
Identification of A and C:
The given information states that when a silvery grey powder of solid (A) is mixed with a powder of solid (B), no reaction occurs. However, when the mixture is ignited and lighted using magnesium ribbon, a reaction occurs with the evolution of a large amount of heat, forming product (C) which settles down as liquid metal, and the solid product (D) formed floats on the liquid (C). It is also mentioned that (C) in solid form reacts with moisture to form rust. The amount of heat generated during the reaction is so high that it is used in welding electric conductors and joints in railway tracks.
- No reaction when A and B are mixed
- Reaction occurs when ignited and lighted using magnesium ribbon
- (C) settles down as liquid metal
- (D) forms and floats on the liquid (C)
- (C) reacts with moisture to form rust
- High amount of heat generated
- Used in welding electric conductors and railway tracks
Analysis:
- The reaction between A and B does not occur unless ignited and lighted using magnesium ribbon.
- The formation of a liquid metal (C) and a solid product (D) suggests that the reaction involves a metal and a non-metal element.
- The fact that (C) reacts with moisture to form rust indicates that (C) is a metal that can undergo oxidation.
- The high amount of heat generated suggests that the reaction is exothermic.
Conclusion:
Based on the given information, the identification of A and C can be made as follows:
- A is aluminum (Al) because it is a silvery grey powder that does not react with the powder of solid B.
- C is iron (Fe) because it settles down as a liquid metal and reacts with moisture to form rust.
Therefore, the correct answer is option 'A': A – Al and C – Fe.
The given information states that when a silvery grey powder of solid (A) is mixed with a powder of solid (B), no reaction occurs. However, when the mixture is ignited and lighted using magnesium ribbon, a reaction occurs with the evolution of a large amount of heat, forming product (C) which settles down as liquid metal, and the solid product (D) formed floats on the liquid (C). It is also mentioned that (C) in solid form reacts with moisture to form rust. The amount of heat generated during the reaction is so high that it is used in welding electric conductors and joints in railway tracks.
- No reaction when A and B are mixed
- Reaction occurs when ignited and lighted using magnesium ribbon
- (C) settles down as liquid metal
- (D) forms and floats on the liquid (C)
- (C) reacts with moisture to form rust
- High amount of heat generated
- Used in welding electric conductors and railway tracks
Analysis:
- The reaction between A and B does not occur unless ignited and lighted using magnesium ribbon.
- The formation of a liquid metal (C) and a solid product (D) suggests that the reaction involves a metal and a non-metal element.
- The fact that (C) reacts with moisture to form rust indicates that (C) is a metal that can undergo oxidation.
- The high amount of heat generated suggests that the reaction is exothermic.
Conclusion:
Based on the given information, the identification of A and C can be made as follows:
- A is aluminum (Al) because it is a silvery grey powder that does not react with the powder of solid B.
- C is iron (Fe) because it settles down as a liquid metal and reacts with moisture to form rust.
Therefore, the correct answer is option 'A': A – Al and C – Fe.
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When a silvery grey powder of a solid (A) is mixed with a powder of solid (B) no reaction occurs. But if the mixture is ignited and lighted using magnesium ribbon a reaction occurs with the evolution of a large amount of heat forming product (C) which settles down as liquid metal and the solid product (D) formed floats on the liquid (C). (C) in solid form reacts with moisture to form rust. The amount of heat generated during the reaction is so high that the reaction is used in welding of electric conductors, joints in railway tracks. Based on this information, answer the questions.Identify A and C?a)A – Al and C – Feb)A – Fe and C – Alc)A – Mg and C- Ald)A – Al and C - CuCorrect answer is option 'A'. Can you explain this answer?
Question Description
When a silvery grey powder of a solid (A) is mixed with a powder of solid (B) no reaction occurs. But if the mixture is ignited and lighted using magnesium ribbon a reaction occurs with the evolution of a large amount of heat forming product (C) which settles down as liquid metal and the solid product (D) formed floats on the liquid (C). (C) in solid form reacts with moisture to form rust. The amount of heat generated during the reaction is so high that the reaction is used in welding of electric conductors, joints in railway tracks. Based on this information, answer the questions.Identify A and C?a)A – Al and C – Feb)A – Fe and C – Alc)A – Mg and C- Ald)A – Al and C - CuCorrect answer is option 'A'. Can you explain this answer? for Class 10 2025 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about When a silvery grey powder of a solid (A) is mixed with a powder of solid (B) no reaction occurs. But if the mixture is ignited and lighted using magnesium ribbon a reaction occurs with the evolution of a large amount of heat forming product (C) which settles down as liquid metal and the solid product (D) formed floats on the liquid (C). (C) in solid form reacts with moisture to form rust. The amount of heat generated during the reaction is so high that the reaction is used in welding of electric conductors, joints in railway tracks. Based on this information, answer the questions.Identify A and C?a)A – Al and C – Feb)A – Fe and C – Alc)A – Mg and C- Ald)A – Al and C - CuCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 10 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for When a silvery grey powder of a solid (A) is mixed with a powder of solid (B) no reaction occurs. But if the mixture is ignited and lighted using magnesium ribbon a reaction occurs with the evolution of a large amount of heat forming product (C) which settles down as liquid metal and the solid product (D) formed floats on the liquid (C). (C) in solid form reacts with moisture to form rust. The amount of heat generated during the reaction is so high that the reaction is used in welding of electric conductors, joints in railway tracks. Based on this information, answer the questions.Identify A and C?a)A – Al and C – Feb)A – Fe and C – Alc)A – Mg and C- Ald)A – Al and C - CuCorrect answer is option 'A'. Can you explain this answer?.
When a silvery grey powder of a solid (A) is mixed with a powder of solid (B) no reaction occurs. But if the mixture is ignited and lighted using magnesium ribbon a reaction occurs with the evolution of a large amount of heat forming product (C) which settles down as liquid metal and the solid product (D) formed floats on the liquid (C). (C) in solid form reacts with moisture to form rust. The amount of heat generated during the reaction is so high that the reaction is used in welding of electric conductors, joints in railway tracks. Based on this information, answer the questions.Identify A and C?a)A – Al and C – Feb)A – Fe and C – Alc)A – Mg and C- Ald)A – Al and C - CuCorrect answer is option 'A'. Can you explain this answer? for Class 10 2025 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about When a silvery grey powder of a solid (A) is mixed with a powder of solid (B) no reaction occurs. But if the mixture is ignited and lighted using magnesium ribbon a reaction occurs with the evolution of a large amount of heat forming product (C) which settles down as liquid metal and the solid product (D) formed floats on the liquid (C). (C) in solid form reacts with moisture to form rust. The amount of heat generated during the reaction is so high that the reaction is used in welding of electric conductors, joints in railway tracks. Based on this information, answer the questions.Identify A and C?a)A – Al and C – Feb)A – Fe and C – Alc)A – Mg and C- Ald)A – Al and C - CuCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 10 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for When a silvery grey powder of a solid (A) is mixed with a powder of solid (B) no reaction occurs. But if the mixture is ignited and lighted using magnesium ribbon a reaction occurs with the evolution of a large amount of heat forming product (C) which settles down as liquid metal and the solid product (D) formed floats on the liquid (C). (C) in solid form reacts with moisture to form rust. The amount of heat generated during the reaction is so high that the reaction is used in welding of electric conductors, joints in railway tracks. Based on this information, answer the questions.Identify A and C?a)A – Al and C – Feb)A – Fe and C – Alc)A – Mg and C- Ald)A – Al and C - CuCorrect answer is option 'A'. Can you explain this answer?.
Solutions for When a silvery grey powder of a solid (A) is mixed with a powder of solid (B) no reaction occurs. But if the mixture is ignited and lighted using magnesium ribbon a reaction occurs with the evolution of a large amount of heat forming product (C) which settles down as liquid metal and the solid product (D) formed floats on the liquid (C). (C) in solid form reacts with moisture to form rust. The amount of heat generated during the reaction is so high that the reaction is used in welding of electric conductors, joints in railway tracks. Based on this information, answer the questions.Identify A and C?a)A – Al and C – Feb)A – Fe and C – Alc)A – Mg and C- Ald)A – Al and C - CuCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 10.
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ample number of questions to practice When a silvery grey powder of a solid (A) is mixed with a powder of solid (B) no reaction occurs. But if the mixture is ignited and lighted using magnesium ribbon a reaction occurs with the evolution of a large amount of heat forming product (C) which settles down as liquid metal and the solid product (D) formed floats on the liquid (C). (C) in solid form reacts with moisture to form rust. The amount of heat generated during the reaction is so high that the reaction is used in welding of electric conductors, joints in railway tracks. Based on this information, answer the questions.Identify A and C?a)A – Al and C – Feb)A – Fe and C – Alc)A – Mg and C- Ald)A – Al and C - CuCorrect answer is option 'A'. Can you explain this answer? tests, examples and also practice Class 10 tests.
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