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What happens when a mixture of NaCl and K2Cr2O7 is gently warmed with conc. H2SO4?
- a)A deep red vapour is evolved.
- b)The vapour when passed into NaOH solution gives a yellow solution of Na2CrO4.
- c)Chlorine gas is evolved.
- d)Chromyl chloride is formed.
Correct answer is option 'A,B,D'. Can you explain this answer?
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What happens when a mixture of NaCl and K2Cr2O7 is gently warmed with...
During this process, chromyl chloride is formed which is deep red coloured fuming liquid.
4NaCl + K2Cr2O7 + H2SO4 
+ 4NaHSO4 + 2KHSO4 + 3H2O
+ 4NaHSO4 + 2KHSO4 + 3H2OThe vapour of CrO2Cl2 when passed into NaOH solution gives a yellow solution of Na2CrO4.
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What happens when a mixture of NaCl and K2Cr2O7 is gently warmed with...
Reaction Overview
When a mixture of sodium chloride (NaCl) and potassium dichromate (K2Cr2O7) is heated with concentrated sulfuric acid (H2SO4), several reactions occur, leading to the formation of distinct products.
Formation of Deep Red Vapors
- Upon heating, a deep red vapor is evolved due to the formation of chromyl chloride (CrO2Cl2), which is known for its intense color.
- This vapor is a result of the reaction between potassium dichromate and the hydrochloric acid produced from the sodium chloride and sulfuric acid.
Yellow Solution Formation
- When the deep red vapor is passed into a sodium hydroxide (NaOH) solution, it reacts to form sodium chromate (Na2CrO4), which gives a yellow color.
- The conversion from CrO2Cl2 to Na2CrO4 indicates the presence of chromium in a higher oxidation state, resulting in this yellow solution.
Chromyl Chloride Production
- The formation of chromyl chloride is significant in this reaction. It is produced when dichromate ions react with chloride ions from NaCl in the presence of concentrated H2SO4.
- This compound contributes to the deep red vapors observed during the reaction.
Conclusion
In summary, the key observations from heating the mixture of NaCl and K2Cr2O7 with concentrated H2SO4 are:
- A deep red vapor (chromyl chloride) is evolved.
- The vapor forms a yellow solution of sodium chromate upon reaction with NaOH.
- Chromyl chloride is indeed formed during the reaction.
Therefore, the correct options are A, B, and D.
When a mixture of sodium chloride (NaCl) and potassium dichromate (K2Cr2O7) is heated with concentrated sulfuric acid (H2SO4), several reactions occur, leading to the formation of distinct products.
Formation of Deep Red Vapors
- Upon heating, a deep red vapor is evolved due to the formation of chromyl chloride (CrO2Cl2), which is known for its intense color.
- This vapor is a result of the reaction between potassium dichromate and the hydrochloric acid produced from the sodium chloride and sulfuric acid.
Yellow Solution Formation
- When the deep red vapor is passed into a sodium hydroxide (NaOH) solution, it reacts to form sodium chromate (Na2CrO4), which gives a yellow color.
- The conversion from CrO2Cl2 to Na2CrO4 indicates the presence of chromium in a higher oxidation state, resulting in this yellow solution.
Chromyl Chloride Production
- The formation of chromyl chloride is significant in this reaction. It is produced when dichromate ions react with chloride ions from NaCl in the presence of concentrated H2SO4.
- This compound contributes to the deep red vapors observed during the reaction.
Conclusion
In summary, the key observations from heating the mixture of NaCl and K2Cr2O7 with concentrated H2SO4 are:
- A deep red vapor (chromyl chloride) is evolved.
- The vapor forms a yellow solution of sodium chromate upon reaction with NaOH.
- Chromyl chloride is indeed formed during the reaction.
Therefore, the correct options are A, B, and D.
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What happens when a mixture of NaCl and K2Cr2O7 is gently warmed with conc. H2SO4?a)A deep red vapour is evolved.b)The vapour when passed into NaOH solution gives a yellow solution of Na2CrO4.c)Chlorine gas is evolved.d)Chromyl chloride is formed.Correct answer is option 'A,B,D'. Can you explain this answer?
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What happens when a mixture of NaCl and K2Cr2O7 is gently warmed with conc. H2SO4?a)A deep red vapour is evolved.b)The vapour when passed into NaOH solution gives a yellow solution of Na2CrO4.c)Chlorine gas is evolved.d)Chromyl chloride is formed.Correct answer is option 'A,B,D'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about What happens when a mixture of NaCl and K2Cr2O7 is gently warmed with conc. H2SO4?a)A deep red vapour is evolved.b)The vapour when passed into NaOH solution gives a yellow solution of Na2CrO4.c)Chlorine gas is evolved.d)Chromyl chloride is formed.Correct answer is option 'A,B,D'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What happens when a mixture of NaCl and K2Cr2O7 is gently warmed with conc. H2SO4?a)A deep red vapour is evolved.b)The vapour when passed into NaOH solution gives a yellow solution of Na2CrO4.c)Chlorine gas is evolved.d)Chromyl chloride is formed.Correct answer is option 'A,B,D'. Can you explain this answer?.
What happens when a mixture of NaCl and K2Cr2O7 is gently warmed with conc. H2SO4?a)A deep red vapour is evolved.b)The vapour when passed into NaOH solution gives a yellow solution of Na2CrO4.c)Chlorine gas is evolved.d)Chromyl chloride is formed.Correct answer is option 'A,B,D'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about What happens when a mixture of NaCl and K2Cr2O7 is gently warmed with conc. H2SO4?a)A deep red vapour is evolved.b)The vapour when passed into NaOH solution gives a yellow solution of Na2CrO4.c)Chlorine gas is evolved.d)Chromyl chloride is formed.Correct answer is option 'A,B,D'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What happens when a mixture of NaCl and K2Cr2O7 is gently warmed with conc. H2SO4?a)A deep red vapour is evolved.b)The vapour when passed into NaOH solution gives a yellow solution of Na2CrO4.c)Chlorine gas is evolved.d)Chromyl chloride is formed.Correct answer is option 'A,B,D'. Can you explain this answer?.
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