1
JEE Main 2019 (Online) 10th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The electrolytes usually used in the electroplating of gold and silver, respectively are :
A
[Au(CN)2] and [Ag(CN)2]
B
[Au(CN)2] and [Ag(Cl)2]
C
[Au(OH)4] and [Ag(OH)2]
D
[Au(NH3)2] and [Ag(CN)2]
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
Out of Syllabus
Change Language
Sodium metal on dissolution in liquid ammonia gives a deep blue solution due to the formation of :
A
ammoniated electrons
B
sodamide
C
sodium-ammonia complex
D
sodium ion-ammonia complex
4
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
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