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1
JEE Main 2020 (Online) 7th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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In comparison to the zeolite process for the removal of permanent hardness, the synthetic resins method is :
A
less efficient as the resins cannot be regenerated.
B
more efficient as it can exchange only cations.
C
more efficient as it can exchange both cations as well as anions.
D
less efficient as it exchanges only anions.
2
JEE Main 2019 (Online) 12th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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The temporary hardness of a water sample is due to compound X. Boiling this sample converts X to compound Y. X and Y, respectively, are :
A
Mg(HCO3)2 and MgCO3
B
Ca(HO3)2 and CaO
C
Ca(HCO3)2 and Ca(OH)2
D
Mg(HCO3)2 and Mg(OH)2
3
JEE Main 2019 (Online) 12th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The metal that gives hydrogen gas upon treatment with both acid as well as base is :
A
mercury
B
zinc
C
iron
D
magnesium
4
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The correct statements among (a) to (d) are :
(a) saline hydrides produce H2 gas when reacted with H2O.
(b) reaction of LiAlH4 with BF3 leads to B2H6.
(c) PH3 and CH4 are electron - rich and electron - precise hydrides, respectively.
(d) HF and CH4 are called as molecular
A
(a), (b), (c) and (d)
B
(a), (c) and (d) only
C
(c) and (d) only
D
(a), (b) and (c) only
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