1
JEE Main 2019 (Online) 10th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The ground state energy of hydrogen atom is – 13.6 eV. The energy of second excited state of He+ ion in eV is :
A
$$-$$ 6.04
B
$$-$$ 54.4
C
$$-$$ 27.2
D
$$-$$ 3.4
2
JEE Main 2019 (Online) 10th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following tests cannot be used for identifying amino acids?
A
Ninhydrin test
B
Barfoed test
C
Xanthoproteic test
D
Biuret test
3
JEE Main 2019 (Online) 10th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
For an elementary chemical reaction,

JEE Main 2019 (Online) 10th January Evening Slot Chemistry - Chemical Kinetics and Nuclear Chemistry Question 174 English

the expression for $${{d\left[ A \right]} \over {dt}}$$ is
A
2K1[A2] – K –1 [A]2
B
K1[A2] – K –1 [A]2
C
K1[A2] + K –1 [A]2
D
2K1[A2] – 2K –1 [A]2
4
JEE Main 2019 (Online) 10th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Which is the most suitable reagent for the following transformation ?

JEE Main 2019 (Online) 10th January Evening Slot Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 238 English
A
alkaline KMnO4
B
Tollen's reagent
C
I2/NaOH
D
CrO2Cl2/CS2

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