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When a substance A reacts with water it produces a combustible gas B and a solution of substance C in water. When another substance D reacts with this solution of C, it also produces the same gas B on warming but D can produce gas B on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour to a smokeless flame of Bunsen burner. A, B, C and D respectively are [1998]
  • a)
    Na , H2, NaOH, Zn
  • b)
    K, H2, KOH, Al
  • c)
    Ca, H2, Ca(OH)2, Sn
  • d)
    CaC2, C2H2, Ca(OH)2, Fe
Correct answer is option 'A'. Can you explain this answer?
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When a substance A reacts with water it produces a combustible gas B a...
Na produces golden yellow colour with smokeless flame of Bunsen burner.
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When a substance A reacts with water it produces a combustible gas B a...
Explanation:

Given:
1. Substance A reacts with water to produce a combustible gas B and a solution of substance C in water.
2. Substance D reacts with the solution of C to produce gas B on warming.
3. Substance D can produce gas B on reaction with dilute sulphuric acid at room temperature.
4. Substance A imparts a deep golden yellow colour to a smokeless flame of Bunsen burner.

Let's analyze each option to determine which one satisfies all the given conditions.

Option A: Na, H2, NaOH, Zn
- Substance A: Sodium (Na)
- Substance B: Hydrogen gas (H2)
- Substance C: Sodium hydroxide (NaOH)
- Substance D: Zinc (Zn)

1. Sodium reacts with water to produce hydrogen gas and sodium hydroxide. This satisfies the first condition.
2. Zinc reacts with the solution of sodium hydroxide to produce hydrogen gas on warming. This satisfies the second condition.
3. Zinc can also produce hydrogen gas on reaction with dilute sulphuric acid at room temperature. This satisfies the third condition.
4. Sodium imparts a deep golden yellow color to a flame. This satisfies the fourth condition.

Option A satisfies all the given conditions. Therefore, the correct answer is option A.

Option B: K, H2, KOH, Al
- Substance A: Potassium (K)
- Substance B: Hydrogen gas (H2)
- Substance C: Potassium hydroxide (KOH)
- Substance D: Aluminum (Al)

1. Potassium reacts with water to produce hydrogen gas and potassium hydroxide. This satisfies the first condition.
2. Aluminum does not react with the solution of potassium hydroxide to produce hydrogen gas on warming. This does not satisfy the second condition.
3. Aluminum cannot produce hydrogen gas on reaction with dilute sulphuric acid at room temperature. This does not satisfy the third condition.
4. Potassium does not impart a deep golden yellow color to a flame. This does not satisfy the fourth condition.

Option B does not satisfy all the given conditions.

Option C: Ca, H2, Ca(OH)2, Sn
- Substance A: Calcium (Ca)
- Substance B: Hydrogen gas (H2)
- Substance C: Calcium hydroxide (Ca(OH)2)
- Substance D: Tin (Sn)

1. Calcium reacts with water to produce hydrogen gas and calcium hydroxide. This satisfies the first condition.
2. Tin does not react with the solution of calcium hydroxide to produce hydrogen gas on warming. This does not satisfy the second condition.
3. Tin cannot produce hydrogen gas on reaction with dilute sulphuric acid at room temperature. This does not satisfy the third condition.
4. Calcium does not impart a deep golden yellow color to a flame. This does not satisfy the fourth condition.

Option C does not satisfy all the given conditions.

Option D: CaC2, C2H2, Ca(OH)2, Fe
- Substance A: Calcium carbide (CaC2)
- Substance B: Acetylene gas (C2H2)
- Substance C: Calcium hydroxide (Ca(OH)2)
- Substance D: Iron (Fe)

1. Calcium carbide reacts with water to produce acetylene gas and calcium hydroxide. This does not satisfy the first
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Importance of high specific heat capacity of water for life Specific heat capacity of a substance is the amount of heat required to raise the temperature of that substance by 1 K. It is expressed in the units J/ (kg K). A high specific heat of a substance means that a large amount of heat is required to raise the temperature of the substance. Water has the highest known specific heat capacity. Its specific heat capacity is 4.186 K J/ (kg K) i.e. to raise the temperature of 1 kg of water by 1 Kelvin it requires 4.186 KJ of heat. For comparison sake, Copper requires only 385 Joules of heat to raise 1 kilogram of copper by 1 Kelvin. It also interesting to know that the specific heat capacities in two other phases of water (i.e. ice and water vapour) are less than this. High specific heat of water is mainly due to the presence of a large number of hydrogen bonds between molecules of water. On a beach on a sunny day, it is noticed that the sand is often quite hot to walk on, but the water is always cool, even in the shallows. This is because sand has a lower specific heat capacity than that of water. Sand takes less energy to raise the temperature by one degree. Because water has a high specific heat capacity, it requires more energy to raise the temperature by one degree. Since the sun puts same rate of energy on water and sand, which heats up sand more quickly and water more slowly. Water covers around 70% of the Earth's surface and its high specific heat plays a very important role to sustain life in the earth. It is able to absorb a lot of heat without a significant rise in the temperature. When temperatures decrease, the heat which is stored is released, restraining a rapid drop in temperature. The combined effect is the buffering of heat. A relatively constant temperature without sudden rise and drop is essential to sustain life. Hence water is important for life.Q. To raise the temperature of 1 kg of water and 1 kg of copper by 1 Kelvin, 4.186 KJ and 385 Joule of heat are required respectively. Which one will get heated up faster if exposed to sun?

Importance of high specific heat capacity of water for life Specific heat capacity of a substance is the amount of heat required to raise the temperature of that substance by 1 K. It is expressed in the units J/ (kg K). A high specific heat of a substance means that a large amount of heat is required to raise the temperature of the substance. Water has the highest known specific heat capacity. Its specific heat capacity is 4.186 K J/ (kg K) i.e. to raise the temperature of 1 kg of water by 1 Kelvin it requires 4.186 KJ of heat. For comparison sake, Copper requires only 385 Joules of heat to raise 1 kilogram of copper by 1 Kelvin. It also interesting to know that the specific heat capacities in two other phases of water (i.e. ice and water vapour) are less than this. High specific heat of water is mainly due to the presence of a large number of hydrogen bonds between molecules of water. On a beach on a sunny day, it is noticed that the sand is often quite hot to walk on, but the water is always cool, even in the shallows. This is because sand has a lower specific heat capacity than that of water. Sand takes less energy to raise the temperature by one degree. Because water has a high specific heat capacity, it requires more energy to raise the temperature by one degree. Since the sun puts same rate of energy on water and sand, which heats up sand more quickly and water more slowly. Water covers around 70% of the Earth's surface and its high specific heat plays a very important role to sustain life in the earth. It is able to absorb a lot of heat without a significant rise in the temperature. When temperatures decrease, the heat which is stored is released, restraining a rapid drop in temperature. The combined effect is the buffering of heat. A relatively constant temperature without sudden rise and drop is essential to sustain life. Hence water is important for life.Q. Which statement is false?

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When a substance A reacts with water it produces a combustible gas B and a solution of substance C in water. When another substance D reacts with this solution of C, it also produces the same gas B on warming but D can produce gas B on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour to a smokeless flame of Bunsen burner. A, B, C and D respectively are [1998]a)Na , H2, NaOH, Znb)K, H2, KOH, Alc)Ca, H2, Ca(OH)2, Snd)CaC2, C2H2, Ca(OH)2, FeCorrect answer is option 'A'. Can you explain this answer?
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When a substance A reacts with water it produces a combustible gas B and a solution of substance C in water. When another substance D reacts with this solution of C, it also produces the same gas B on warming but D can produce gas B on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour to a smokeless flame of Bunsen burner. A, B, C and D respectively are [1998]a)Na , H2, NaOH, Znb)K, H2, KOH, Alc)Ca, H2, Ca(OH)2, Snd)CaC2, C2H2, Ca(OH)2, FeCorrect answer is option 'A'. Can you explain this answer? for Class 11 2024 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about When a substance A reacts with water it produces a combustible gas B and a solution of substance C in water. When another substance D reacts with this solution of C, it also produces the same gas B on warming but D can produce gas B on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour to a smokeless flame of Bunsen burner. A, B, C and D respectively are [1998]a)Na , H2, NaOH, Znb)K, H2, KOH, Alc)Ca, H2, Ca(OH)2, Snd)CaC2, C2H2, Ca(OH)2, FeCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 11 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for When a substance A reacts with water it produces a combustible gas B and a solution of substance C in water. When another substance D reacts with this solution of C, it also produces the same gas B on warming but D can produce gas B on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour to a smokeless flame of Bunsen burner. A, B, C and D respectively are [1998]a)Na , H2, NaOH, Znb)K, H2, KOH, Alc)Ca, H2, Ca(OH)2, Snd)CaC2, C2H2, Ca(OH)2, FeCorrect answer is option 'A'. Can you explain this answer?.
Solutions for When a substance A reacts with water it produces a combustible gas B and a solution of substance C in water. When another substance D reacts with this solution of C, it also produces the same gas B on warming but D can produce gas B on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour to a smokeless flame of Bunsen burner. A, B, C and D respectively are [1998]a)Na , H2, NaOH, Znb)K, H2, KOH, Alc)Ca, H2, Ca(OH)2, Snd)CaC2, C2H2, Ca(OH)2, FeCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 11. Download more important topics, notes, lectures and mock test series for Class 11 Exam by signing up for free.
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