JEE Exam > JEE Questions > Directions: The following question has four ...
Start Learning for Free
Directions: The following question has four choices, out of which one or more is/are correct.
Which of the following statements about some of the observations during qualitative salt analysis is/are correct?
- a)An aqueous solution of Co(II) thiocyanate (10% freshly prepared) and mercuric nitrate solution, when taken in equal volumes, produces deep-blue precipitate on scratching the wall of the vessel with a glass rod.
- b)White precipitate of Al(OH)3 is soluble in sodium hydroxide as well as in ammonia solution.
- c)Green precipitate of Cr(OH)3 readily dissolves in excess of sodium hydroxide, forming a green solution.
- d)Chromium (III) salts give green coloured borax beads in both oxidising and reducing flame.
Correct answer is option 'A,C,D'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Most Upvoted Answer
Directions: The following question has four choices, out of which one...
Gelatenous white crystals of Al(OH)3 are soluble in NaOH(aq) because of the formation of soluble sodium aluminate.
Al(OH)3 + NaOH → Na[Al(OH)4]
However, Al(OH)3 is insoluble in aqueous NH3 because Al(OH)3 precipitates at higher pH, but dissolves when the pH is low.
Hence, option (b) is incorrect.
An aqueous solution of Co(II) thiocyanate (10% freshly prepared) and mercuric nitrate solution, when taken in equal volumes, produces deep-blue precipitate on scratching the wall of the vessel with a glass rod due to the formation of mercuric tetrathiocyanatocobaltate(II) and Hg2[Co(CNS)6] (deep blue ppt).
Green precipitate of Cr(OH)3 readily dissolves in excess of sodium hydroxide, forming a green solution.
Chromium (III) salts give green coloured borax beads in both oxidising and reducing flame.
Hence, options (a), (c) and (d) are correct.
Free Test
FREE
| Start Free Test |
Community Answer
Directions: The following question has four choices, out of which one...
Qualitative Salt Analysis
Introduction:
Qualitative salt analysis is a technique used to identify and determine the composition of different salts present in a given solution. It involves various chemical reactions and observations to identify the cations and anions present in the salt.
Explanation:
Let's analyze each statement and determine whether they are correct or not.
a) An aqueous solution of Co(II) thiocyanate (10% freshly prepared) and mercuric nitrate solution, when taken in equal volumes, produces a deep-blue precipitate on scratching the wall of the vessel with a glass rod.
This statement is correct. When a solution of Co(II) thiocyanate and mercuric nitrate are mixed in equal volumes, it forms a complex compound called cobalt thiocyanate. This complex compound is deep blue in color. When the wall of the vessel is scratched with a glass rod, the precipitate becomes visible.
b) White precipitate of Al(OH)3 is soluble in sodium hydroxide as well as in ammonia solution.
This statement is incorrect. White precipitate of Al(OH)3 is not soluble in sodium hydroxide or ammonia solution. It is insoluble in both these reagents.
c) Green precipitate of Cr(OH)3 readily dissolves in excess of sodium hydroxide, forming a green solution.
This statement is correct. Green precipitate of Cr(OH)3 dissolves in excess sodium hydroxide to form a green solution. This reaction indicates the presence of chromium in the salt.
d) Chromium (III) salts give green-colored borax beads in both oxidizing and reducing flame.
This statement is correct. Chromium (III) salts give green-colored borax beads in both oxidizing and reducing flames during the borax bead test. This observation helps in identifying the presence of chromium in the salt.
Therefore, the correct statements are A, C, and D.
Introduction:
Qualitative salt analysis is a technique used to identify and determine the composition of different salts present in a given solution. It involves various chemical reactions and observations to identify the cations and anions present in the salt.
Explanation:
Let's analyze each statement and determine whether they are correct or not.
a) An aqueous solution of Co(II) thiocyanate (10% freshly prepared) and mercuric nitrate solution, when taken in equal volumes, produces a deep-blue precipitate on scratching the wall of the vessel with a glass rod.
This statement is correct. When a solution of Co(II) thiocyanate and mercuric nitrate are mixed in equal volumes, it forms a complex compound called cobalt thiocyanate. This complex compound is deep blue in color. When the wall of the vessel is scratched with a glass rod, the precipitate becomes visible.
b) White precipitate of Al(OH)3 is soluble in sodium hydroxide as well as in ammonia solution.
This statement is incorrect. White precipitate of Al(OH)3 is not soluble in sodium hydroxide or ammonia solution. It is insoluble in both these reagents.
c) Green precipitate of Cr(OH)3 readily dissolves in excess of sodium hydroxide, forming a green solution.
This statement is correct. Green precipitate of Cr(OH)3 dissolves in excess sodium hydroxide to form a green solution. This reaction indicates the presence of chromium in the salt.
d) Chromium (III) salts give green-colored borax beads in both oxidizing and reducing flame.
This statement is correct. Chromium (III) salts give green-colored borax beads in both oxidizing and reducing flames during the borax bead test. This observation helps in identifying the presence of chromium in the salt.
Therefore, the correct statements are A, C, and D.
Attention JEE Students!
To make sure you are not studying endlessly, EduRev has designed JEE study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in JEE.
|
Explore Courses for JEE exam
|
|
Similar JEE Doubts
Top Courses for JEEView all
Directions: The following question has four choices, out of which one or more is/are correct.Which of the following statements about some of the observations during qualitative salt analysis is/are correct?a)An aqueous solution of Co(II) thiocyanate (10% freshly prepared) and mercuric nitrate solution, when taken in equal volumes, produces deep-blue precipitate on scratching the wall of the vessel with a glass rod.b)White precipitate of Al(OH)3 is soluble in sodium hydroxide as well as in ammonia solution.c)Green precipitate of Cr(OH)3 readily dissolves in excess of sodium hydroxide, forming a green solution.d)Chromium (III) salts give green coloured borax beads in both oxidising and reducing flame.Correct answer is option 'A,C,D'. Can you explain this answer?
Question Description
Directions: The following question has four choices, out of which one or more is/are correct.Which of the following statements about some of the observations during qualitative salt analysis is/are correct?a)An aqueous solution of Co(II) thiocyanate (10% freshly prepared) and mercuric nitrate solution, when taken in equal volumes, produces deep-blue precipitate on scratching the wall of the vessel with a glass rod.b)White precipitate of Al(OH)3 is soluble in sodium hydroxide as well as in ammonia solution.c)Green precipitate of Cr(OH)3 readily dissolves in excess of sodium hydroxide, forming a green solution.d)Chromium (III) salts give green coloured borax beads in both oxidising and reducing flame.Correct answer is option 'A,C,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 Directions: The following question has four choices, out of which one or more is/are correct.Which of the following statements about some of the observations during qualitative salt analysis is/are correct?a)An aqueous solution of Co(II) thiocyanate (10% freshly prepared) and mercuric nitrate solution, when taken in equal volumes, produces deep-blue precipitate on scratching the wall of the vessel with a glass rod.b)White precipitate of Al(OH)3 is soluble in sodium hydroxide as well as in ammonia solution.c)Green precipitate of Cr(OH)3 readily dissolves in excess of sodium hydroxide, forming a green solution.d)Chromium (III) salts give green coloured borax beads in both oxidising and reducing flame.Correct answer is option 'A,C,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 Directions: The following question has four choices, out of which one or more is/are correct.Which of the following statements about some of the observations during qualitative salt analysis is/are correct?a)An aqueous solution of Co(II) thiocyanate (10% freshly prepared) and mercuric nitrate solution, when taken in equal volumes, produces deep-blue precipitate on scratching the wall of the vessel with a glass rod.b)White precipitate of Al(OH)3 is soluble in sodium hydroxide as well as in ammonia solution.c)Green precipitate of Cr(OH)3 readily dissolves in excess of sodium hydroxide, forming a green solution.d)Chromium (III) salts give green coloured borax beads in both oxidising and reducing flame.Correct answer is option 'A,C,D'. Can you explain this answer?.
Directions: The following question has four choices, out of which one or more is/are correct.Which of the following statements about some of the observations during qualitative salt analysis is/are correct?a)An aqueous solution of Co(II) thiocyanate (10% freshly prepared) and mercuric nitrate solution, when taken in equal volumes, produces deep-blue precipitate on scratching the wall of the vessel with a glass rod.b)White precipitate of Al(OH)3 is soluble in sodium hydroxide as well as in ammonia solution.c)Green precipitate of Cr(OH)3 readily dissolves in excess of sodium hydroxide, forming a green solution.d)Chromium (III) salts give green coloured borax beads in both oxidising and reducing flame.Correct answer is option 'A,C,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 Directions: The following question has four choices, out of which one or more is/are correct.Which of the following statements about some of the observations during qualitative salt analysis is/are correct?a)An aqueous solution of Co(II) thiocyanate (10% freshly prepared) and mercuric nitrate solution, when taken in equal volumes, produces deep-blue precipitate on scratching the wall of the vessel with a glass rod.b)White precipitate of Al(OH)3 is soluble in sodium hydroxide as well as in ammonia solution.c)Green precipitate of Cr(OH)3 readily dissolves in excess of sodium hydroxide, forming a green solution.d)Chromium (III) salts give green coloured borax beads in both oxidising and reducing flame.Correct answer is option 'A,C,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 Directions: The following question has four choices, out of which one or more is/are correct.Which of the following statements about some of the observations during qualitative salt analysis is/are correct?a)An aqueous solution of Co(II) thiocyanate (10% freshly prepared) and mercuric nitrate solution, when taken in equal volumes, produces deep-blue precipitate on scratching the wall of the vessel with a glass rod.b)White precipitate of Al(OH)3 is soluble in sodium hydroxide as well as in ammonia solution.c)Green precipitate of Cr(OH)3 readily dissolves in excess of sodium hydroxide, forming a green solution.d)Chromium (III) salts give green coloured borax beads in both oxidising and reducing flame.Correct answer is option 'A,C,D'. Can you explain this answer?.
Solutions for Directions: The following question has four choices, out of which one or more is/are correct.Which of the following statements about some of the observations during qualitative salt analysis is/are correct?a)An aqueous solution of Co(II) thiocyanate (10% freshly prepared) and mercuric nitrate solution, when taken in equal volumes, produces deep-blue precipitate on scratching the wall of the vessel with a glass rod.b)White precipitate of Al(OH)3 is soluble in sodium hydroxide as well as in ammonia solution.c)Green precipitate of Cr(OH)3 readily dissolves in excess of sodium hydroxide, forming a green solution.d)Chromium (III) salts give green coloured borax beads in both oxidising and reducing flame.Correct answer is option 'A,C,D'. Can you explain this answer? in English & in Hindi are available as part of our courses for JEE.
Download more important topics, notes, lectures and mock test series for JEE Exam by signing up for free.
Here you can find the meaning of Directions: The following question has four choices, out of which one or more is/are correct.Which of the following statements about some of the observations during qualitative salt analysis is/are correct?a)An aqueous solution of Co(II) thiocyanate (10% freshly prepared) and mercuric nitrate solution, when taken in equal volumes, produces deep-blue precipitate on scratching the wall of the vessel with a glass rod.b)White precipitate of Al(OH)3 is soluble in sodium hydroxide as well as in ammonia solution.c)Green precipitate of Cr(OH)3 readily dissolves in excess of sodium hydroxide, forming a green solution.d)Chromium (III) salts give green coloured borax beads in both oxidising and reducing flame.Correct answer is option 'A,C,D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Directions: The following question has four choices, out of which one or more is/are correct.Which of the following statements about some of the observations during qualitative salt analysis is/are correct?a)An aqueous solution of Co(II) thiocyanate (10% freshly prepared) and mercuric nitrate solution, when taken in equal volumes, produces deep-blue precipitate on scratching the wall of the vessel with a glass rod.b)White precipitate of Al(OH)3 is soluble in sodium hydroxide as well as in ammonia solution.c)Green precipitate of Cr(OH)3 readily dissolves in excess of sodium hydroxide, forming a green solution.d)Chromium (III) salts give green coloured borax beads in both oxidising and reducing flame.Correct answer is option 'A,C,D'. Can you explain this answer?, a detailed solution for Directions: The following question has four choices, out of which one or more is/are correct.Which of the following statements about some of the observations during qualitative salt analysis is/are correct?a)An aqueous solution of Co(II) thiocyanate (10% freshly prepared) and mercuric nitrate solution, when taken in equal volumes, produces deep-blue precipitate on scratching the wall of the vessel with a glass rod.b)White precipitate of Al(OH)3 is soluble in sodium hydroxide as well as in ammonia solution.c)Green precipitate of Cr(OH)3 readily dissolves in excess of sodium hydroxide, forming a green solution.d)Chromium (III) salts give green coloured borax beads in both oxidising and reducing flame.Correct answer is option 'A,C,D'. Can you explain this answer? has been provided alongside types of Directions: The following question has four choices, out of which one or more is/are correct.Which of the following statements about some of the observations during qualitative salt analysis is/are correct?a)An aqueous solution of Co(II) thiocyanate (10% freshly prepared) and mercuric nitrate solution, when taken in equal volumes, produces deep-blue precipitate on scratching the wall of the vessel with a glass rod.b)White precipitate of Al(OH)3 is soluble in sodium hydroxide as well as in ammonia solution.c)Green precipitate of Cr(OH)3 readily dissolves in excess of sodium hydroxide, forming a green solution.d)Chromium (III) salts give green coloured borax beads in both oxidising and reducing flame.Correct answer is option 'A,C,D'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Directions: The following question has four choices, out of which one or more is/are correct.Which of the following statements about some of the observations during qualitative salt analysis is/are correct?a)An aqueous solution of Co(II) thiocyanate (10% freshly prepared) and mercuric nitrate solution, when taken in equal volumes, produces deep-blue precipitate on scratching the wall of the vessel with a glass rod.b)White precipitate of Al(OH)3 is soluble in sodium hydroxide as well as in ammonia solution.c)Green precipitate of Cr(OH)3 readily dissolves in excess of sodium hydroxide, forming a green solution.d)Chromium (III) salts give green coloured borax beads in both oxidising and reducing flame.Correct answer is option 'A,C,D'. Can you explain this answer? tests, examples and also practice JEE tests.
|
|
Explore Courses for JEE exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup