1
JEE Main 2020 (Online) 4th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The shortest wavelength of H atom in the Lyman series is $$\lambda $$1. The longest wavelength in the Balmar series of He+ is :
A
$${{5{\lambda _1}} \over 9}$$
B
$${{36{\lambda _1}} \over 5}$$
C
$${{27{\lambda _1}} \over 5}$$
D
$${{9{\lambda _1}} \over 5}$$
2
JEE Main 2020 (Online) 4th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
250 mL of a waste solution obtained from the workshop of a goldsmith contains 0.1 M AgNO3 and 0.1 M AuCl. The solution was electrolyzed at 2V by passing a current of 1A for 15 minutes. The metal/metals electrodeposited will be

[ $$E_{A{g^ + }/Ag}^0$$ = 0.80 V, $$E_{A{u^ + }/Au}^0$$ = 1.69 V ]
A
Silver and gold in equal mass proportion
B
Silver and gold in proportion to their atomic weights
C
Only gold
D
Only silver
3
JEE Main 2020 (Online) 4th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The major product [C] of the following reaction sequence will be : JEE Main 2020 (Online) 4th September Evening Slot Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 125 English
A
JEE Main 2020 (Online) 4th September Evening Slot Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 125 English Option 1
B
JEE Main 2020 (Online) 4th September Evening Slot Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 125 English Option 2
C
JEE Main 2020 (Online) 4th September Evening Slot Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 125 English Option 3
D
JEE Main 2020 (Online) 4th September Evening Slot Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 125 English Option 4
4
JEE Main 2020 (Online) 4th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
A sample of red ink (a colloidal suspension) is prepared by mixing eosin dye, egg white, HCHO and water. The component which ensures stability of the ink sample is :
A
HCHO
B
Water
C
Eosin dye
D
Egg white
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