1
JEE Main 2020 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Among the statements (a)-(d) the correct ones are :

(a) Lithium has the highest hydration enthalpy among the alkali metals.

(b) Lithium chloride is insoluble in pyridine.

(c) Lithium cannot form ethynide upon its reaction with ethyne.

(d) Both lithium and magnesium react slowly with H2O.
A
(b) and (c) only
B
(a) and (d) only
C
(a), (b) and (d) only
D
(a), (c) and (d) only
2
JEE Main 2020 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Biochemical Oxygen Demand (BOD) is the amount of oxygen required (in ppm) :
A
for sustaining life in a water body.
B
by anaerobic bacteria to breakdown inorganic waste present in a water body.
C
for the photochemical breakdown of waste present in 1 m3 volume of a water body.
D
by bacteria to break-down organic waste in a certain volume of a water sample.
3
JEE Main 2020 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The correct order of the spin-only magnetic moments of the following complexes is :
(I) [Cr(H2O)6]Br2
(II) Na4[Fe(CN)6]
(III) Na3[Fe(C2O4)3] ($$\Delta $$0 $$>$$ P)
(IV) (Et4N)2[CoCl4]
A
(III) > (I) > (II) > (IV)
B
(II) $$ \approx $$ (I) > (IV) > (III)
C
(III) > (I) > (IV) > (II)
D
(I) > (IV) > (III) > (II)
4
JEE Main 2020 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Amongst the following, the form of water with the lowest ionic conductance at 298 K is :
A
saline water used for intravenous injection
B
sea water
C
distilled water
D
water from a well
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