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1
JEE Main 2019 (Online) 10th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The effect of lanthanoid contraction in the lanthanoid series of elements by and large means :
A
increase in atomic radii and decrease in ionic radii
B
increase in both atomic and ionic radii
C
decrease in both atomic and ionic radii
D
decrease in atomic radii and increase in ionic radii
2
JEE Main 2019 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The transition element that has lowest enthalpy of atomisation, is :
A
Fe
B
Cu
C
V
D
Zn
3
JEE Main 2018 (Online) 16th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The incorrect statement is :
A
Cu2+ salts give red coloured borax bead test in reducing flame.
B
Cu2+ and Ni2+ ions give black precipitate with H2S in presence of HCl solution.
C
Ferric ion gives blood red color with potasium thiocyanate.
D
Cu2+ ion gives chocolate coloured preciitate with potassium ferrocyanide solution.
4
JEE Main 2018 (Online) 16th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
When XO2 is fused with an alkali metal hydroxide in presence of an oxidizing agent such as KNO3 ; a dark green product is formed which disproportioates in acidic solution to afforda dark purple solution. X is :
A
Ti
B
V
C
Cr
D
Mn
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