1
JEE Main 2018 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following compounds will be suitable for Kjeldahl’s method for nitrogen estimation?
A
JEE Main 2018 (Offline) Chemistry - Practical Organic Chemistry Question 88 English Option 1
B
JEE Main 2018 (Offline) Chemistry - Practical Organic Chemistry Question 88 English Option 2
C
JEE Main 2018 (Offline) Chemistry - Practical Organic Chemistry Question 88 English Option 3
D
JEE Main 2018 (Offline) Chemistry - Practical Organic Chemistry Question 88 English Option 4
2
JEE Main 2017 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A solution containing a group-IV cation gives a precipitate on passing H2S. A solution of this precipitate in dil.HCl produces a white precipitate with NaOH solution and bluish-white precipitate with basic potassium ferrocyanide. The cation is :
A
Co2+
B
Ni2+
C
Mn2+
D
Zn2+
3
JEE Main 2016 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Sodium extract is heated with concentrated HNO3 before testing for halogens because :
A
Silver halides are totally insoluble in nitric acid.
B
Ag2S and AgCN are soluble in acidic medium.
C
S2 and CN, if present, are decomposed by conc. HNO3 and hence do not interfere in the test.
D
Ag reacts faster with halides in acidic medium.
4
AIEEE 2011
MCQ (Single Correct Answer)
+4
-1
Which of the following reagents may be used to distinguish between phenol and benzoic acid ?
A
Tollen’s reagent
B
Molisch reagent
C
Neutral FeCl3
D
Aqueous NaOH
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