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NH4Cl (s) is heated in test tube. Vapours are brought in contact with red litmus paper, which changes to blue and then to red. It is because of :
- a)Formation of NH4OH and HCl
- b)Formation of NH3 and HCl
- c)Greater diffusion of NH3 than HCl
- d)Greater diffusion of HCl than NH3
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
NH4Cl (s) is heated in test tube. Vapours are brought in contact with ...
Explanation:
When NH4Cl (ammonium chloride) is heated, it undergoes sublimation, which means it directly changes from a solid to a gas without forming a liquid intermediate. The chemical equation for this reaction is as follows:
NH4Cl (s) → NH3 (g) + HCl (g)
The vapors produced consist of ammonia gas (NH3) and hydrogen chloride gas (HCl). When these vapors come in contact with red litmus paper, it undergoes the following color changes:
1. Change to blue: The red litmus paper turns blue when it comes in contact with the ammonia gas (NH3). This is because ammonia is a basic substance and reacts with the water present in the litmus paper to form ammonium hydroxide (NH4OH), which is alkaline in nature. This alkaline nature turns the red litmus paper blue.
2. Change back to red: After some time, the blue litmus paper turns back to red. This is because the hydrogen chloride gas (HCl) also present in the vapors reacts with the ammonium hydroxide (NH4OH) formed in the previous step. The reaction between HCl and NH4OH is as follows:
NH4OH (aq) + HCl (g) → NH4Cl (aq) + H2O (l)
The reaction between ammonium hydroxide and hydrogen chloride produces ammonium chloride (NH4Cl) and water (H2O). Ammonium chloride is acidic in nature, and it turns the blue litmus paper back to red.
Conclusion:
The change in color of the red litmus paper to blue and then back to red indicates the presence of ammonia gas (NH3) and hydrogen chloride gas (HCl) in the vapors. The initial change to blue is due to the formation of ammonium hydroxide (NH4OH) from ammonia, and the subsequent change back to red is due to the formation of ammonium chloride (NH4Cl) from the reaction between ammonium hydroxide and hydrogen chloride. The greater diffusion of ammonia gas (NH3) compared to hydrogen chloride gas (HCl) is responsible for the blue color change being observed before the red color change. Therefore, option C, "Greater diffusion of NH3 than HCl," is the correct answer.
When NH4Cl (ammonium chloride) is heated, it undergoes sublimation, which means it directly changes from a solid to a gas without forming a liquid intermediate. The chemical equation for this reaction is as follows:
NH4Cl (s) → NH3 (g) + HCl (g)
The vapors produced consist of ammonia gas (NH3) and hydrogen chloride gas (HCl). When these vapors come in contact with red litmus paper, it undergoes the following color changes:
1. Change to blue: The red litmus paper turns blue when it comes in contact with the ammonia gas (NH3). This is because ammonia is a basic substance and reacts with the water present in the litmus paper to form ammonium hydroxide (NH4OH), which is alkaline in nature. This alkaline nature turns the red litmus paper blue.
2. Change back to red: After some time, the blue litmus paper turns back to red. This is because the hydrogen chloride gas (HCl) also present in the vapors reacts with the ammonium hydroxide (NH4OH) formed in the previous step. The reaction between HCl and NH4OH is as follows:
NH4OH (aq) + HCl (g) → NH4Cl (aq) + H2O (l)
The reaction between ammonium hydroxide and hydrogen chloride produces ammonium chloride (NH4Cl) and water (H2O). Ammonium chloride is acidic in nature, and it turns the blue litmus paper back to red.
Conclusion:
The change in color of the red litmus paper to blue and then back to red indicates the presence of ammonia gas (NH3) and hydrogen chloride gas (HCl) in the vapors. The initial change to blue is due to the formation of ammonium hydroxide (NH4OH) from ammonia, and the subsequent change back to red is due to the formation of ammonium chloride (NH4Cl) from the reaction between ammonium hydroxide and hydrogen chloride. The greater diffusion of ammonia gas (NH3) compared to hydrogen chloride gas (HCl) is responsible for the blue color change being observed before the red color change. Therefore, option C, "Greater diffusion of NH3 than HCl," is the correct answer.
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Community Answer
NH4Cl (s) is heated in test tube. Vapours are brought in contact with ...
As NH3 has low molecular mass than HCl so it will diffuse faster than HCl so 1st red litmus changes to blue and then blue changes to red colour.
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NH4Cl (s) is heated in test tube. Vapours are brought in contact with red litmus paper, whichchanges to blue and then to red. It is because of :a)Formation of NH4OH and HClb)Formation of NH3 and HClc)Greater diffusion of NH3 than HCld)Greater diffusion of HCl than NH3Correct answer is option 'C'. Can you explain this answer?
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NH4Cl (s) is heated in test tube. Vapours are brought in contact with red litmus paper, whichchanges to blue and then to red. It is because of :a)Formation of NH4OH and HClb)Formation of NH3 and HClc)Greater diffusion of NH3 than HCld)Greater diffusion of HCl than NH3Correct answer is option 'C'. Can you explain this answer? for Chemistry 2025 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about NH4Cl (s) is heated in test tube. Vapours are brought in contact with red litmus paper, whichchanges to blue and then to red. It is because of :a)Formation of NH4OH and HClb)Formation of NH3 and HClc)Greater diffusion of NH3 than HCld)Greater diffusion of HCl than NH3Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Chemistry 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for NH4Cl (s) is heated in test tube. Vapours are brought in contact with red litmus paper, whichchanges to blue and then to red. It is because of :a)Formation of NH4OH and HClb)Formation of NH3 and HClc)Greater diffusion of NH3 than HCld)Greater diffusion of HCl than NH3Correct answer is option 'C'. Can you explain this answer?.
NH4Cl (s) is heated in test tube. Vapours are brought in contact with red litmus paper, whichchanges to blue and then to red. It is because of :a)Formation of NH4OH and HClb)Formation of NH3 and HClc)Greater diffusion of NH3 than HCld)Greater diffusion of HCl than NH3Correct answer is option 'C'. Can you explain this answer? for Chemistry 2025 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about NH4Cl (s) is heated in test tube. Vapours are brought in contact with red litmus paper, whichchanges to blue and then to red. It is because of :a)Formation of NH4OH and HClb)Formation of NH3 and HClc)Greater diffusion of NH3 than HCld)Greater diffusion of HCl than NH3Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Chemistry 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for NH4Cl (s) is heated in test tube. Vapours are brought in contact with red litmus paper, whichchanges to blue and then to red. It is because of :a)Formation of NH4OH and HClb)Formation of NH3 and HClc)Greater diffusion of NH3 than HCld)Greater diffusion of HCl than NH3Correct answer is option 'C'. Can you explain this answer?.
Solutions for NH4Cl (s) is heated in test tube. Vapours are brought in contact with red litmus paper, whichchanges to blue and then to red. It is because of :a)Formation of NH4OH and HClb)Formation of NH3 and HClc)Greater diffusion of NH3 than HCld)Greater diffusion of HCl than NH3Correct answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Chemistry.
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