1
JEE Main 2019 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
The element having greatest difference between its first and second ionization energies, is :
A
Ba
B
Ca
C
Sc
D
K
2
JEE Main 2019 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
For any given series of spectral lines of atomic hydrogen, let $$\Delta \mathop v\limits^\_ = $$ $$\Delta {\overline v _{\max }} - \Delta {\overline v _{\min }}$$ be the difference in maximum and minimum frequencies in cm–1. The ratio Lyman Balmer $${{\Delta {{\overline v }_{Lyman}}} \over {\Delta {{\overline v }_{Balmer}}}}$$ is :
A
9 : 4
B
4 : 1
C
27 : 5
D
5 : 4
3
JEE Main 2019 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
The major product of the following reaction is :
JEE Main 2019 (Online) 9th April Morning Slot Chemistry - Hydrocarbons Question 86 English
A
CH3CD2CH(Cl)(I)
B
CH3CD(Cl)CHD(I)
C
CH3C(I)(Cl)CHD2
D
CH3CD(I)CHD(Cl)
4
JEE Main 2019 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Match the catalysts (Column I) with products (Column II).

Column I Column II
(A) V2O5 (i) Polyethylene
(B) TiCl4/Al(Me)3 (ii) ethanal
(C) PdCl2 (iii) H2SO4
(D) Iron Oxide (iv) NH3
A
(A)-(iii); (B)-(i); (C)-(ii); (D)-(iv)
B
(A)-(ii); (B)-(iii); (C)-(i); (D)-(iv)
C
(A)-(iii); (B)-(iv); (C)-(i); (D)-(ii)
D
(A)-(iv); (B)-(iii); (C)-(ii); (D)-(i)
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