1
JEE Main 2019 (Online) 12th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
The hardness of a water sample (in terms of equivalents of CaCO3) containing 10–3 M CaSO4 is (Molar mass of CaSO4 = 136 g mol–1)
A
90 ppm
B
100 ppm
C
50 ppm
D
10 ppm
2
JEE Main 2019 (Online) 12th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Poly $$\beta $$ –hydroxybutyrate-co-$$\beta $$-hydroxyvalerate (PHBV) is a copolymer of
A
2-hydroxybutanoic acid and 3-hydroxypentanoic acid
B
3-hydroxybutanoic acid and 2-hydroxypentanoic acid
C
3-hydroxybutanoic acid and 3-hydroxypentanoic acid
D
3-hydroxybutanoic acid and 4-hydroxypentanoic acid
3
JEE Main 2019 (Online) 12th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
The metal d-orbitals that are directly facing the ligands in K3[Co(CN)6] are -
A
dx2$$-$$y2 and dz2
B
dxy, dxz and dyz
C
dxz, dyz and dz2
D
dxy and dx2 $$-$$ y2
4
JEE Main 2019 (Online) 12th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Decomposition of X exhibits a rate constant of 0.05 $$\mu $$g/year. How many year are required for the decomposition of 5$$\mu $$g of X into 2.5 $$\mu $$g?
A
50
B
20
C
25
D
40
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