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1
JEE Main 2021 (Online) 22th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Which one of the following statements for D.I. Mendeleeff, is incorrect?
A
He authored the textbook - Principles of Chemistry
B
At the time, he proposed Periodic Table of elements structure of atom was known.
C
Element with atomic number 101 is named after him.
D
He invented accurate barometer.
2
JEE Main 2021 (Online) 22th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
The set having ions which are coloured and paramagnetic both is -
A
Cu2+, Cr3+, Sc+
B
Cu2+, Zn2+, Mn4+
C
Sc3+, V5+, Ti4+
D
Ni2+, Mn7+, Hg2+
3
JEE Main 2021 (Online) 18th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
The first ionization energy of magnesium is smaller as compared to that of elements X and Y, but higher than that of Z. The elements X, Y and Z, respectively, are :
A
neon, sodium and chlorine
B
argon, chlorine and sodium
C
chlorine, lithium and sodium
D
argon, lithium and sodium
4
JEE Main 2021 (Online) 17th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
The common positive oxidation states for an element with atomic number 24, are :
A
+1 and +3
B
+2 to +6
C
+1 to +6
D
+1 and +3 to +6
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