1
JEE Main 2019 (Online) 12th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The pair of metal ions that can give a spin only magnetic moment of 3.9 BM for the complex [M(H2O)6]Cl2, is -
A
V2+ and Fe2+
B
V2+ and Co2+
C
Co2+ and Fe2+
D
Cr2+ and Mn2+
2
JEE Main 2019 (Online) 12th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
What is the work function of the metal if the light of wavelength 4000$$\mathop A\limits^ \circ $$ generates photoelectrons of velocity 6 $$ \times $$ 105 ms–1 from it ?
(Mass of electron = 9 $$ \times $$ 10–31 kg;
Velocity of light = 3 $$ \times $$ 108 ms$$-$$1
Plank's constant = 6.626 $$ \times $$ 10–34 Js;
Charge of electron = 1.6 $$ \times $$10–19 JeV–1)
A
4.0 eV
B
0.9 eV
C
2.1 eV
D
3.1 eV
3
JEE Main 2019 (Online) 12th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The element with Z = 120 (not yet discovered) will be an/a -
A
Alkaline earth metal
B
Alkali metal
C
Transition metal
D
Inner transition metal
4
JEE Main 2019 (Online) 12th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
In the following reaction, products A and B are –

JEE Main 2019 (Online) 12th January Morning Slot Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 157 English
A
JEE Main 2019 (Online) 12th January Morning Slot Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 157 English Option 1
B
JEE Main 2019 (Online) 12th January Morning Slot Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 157 English Option 2
C
JEE Main 2019 (Online) 12th January Morning Slot Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 157 English Option 3
D
JEE Main 2019 (Online) 12th January Morning Slot Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 157 English Option 4
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