1
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The ratio of the shortest wavelength of two spectral series of hydrogen spectrum is found to be about 9. The spectral series are :
A
Paschen and Pfund
B
Balmer and Brackett
C
Lyman and Paschen
D
Brackett and Pfund
2
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The highest possible oxidation states of uranium and plutonium, respectively are :
A
4 and 6
B
6 and 4
C
7 and 6
D
6 and 7
3
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
In chromatography, which of the following statements is incorrect for Rf ?
A
Rf value depends on the type of chromatography.
B
Higher Rf value means higher adsorption.
C
Rf value is dependent on the mobile phase.
D
The value of Rf can not be more than one.
4
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Compound A(C9H10O) shows positive iodoform test. Oxidation of A with KMnO4/KOH given acid B(C8H6O4). Anhydride of B is used for the preparation of phenolphthalein. Compound A is:
A
JEE Main 2019 (Online) 10th April Evening Slot Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 221 English Option 1
B
JEE Main 2019 (Online) 10th April Evening Slot Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 221 English Option 2
C
JEE Main 2019 (Online) 10th April Evening Slot Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 221 English Option 3
D
JEE Main 2019 (Online) 10th April Evening Slot Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 221 English Option 4

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