1
JEE Main 2019 (Online) 10th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A mixture of 100 m mol of Ca(OH)2 and 2 g of sodium sulphate was dissolved in water and the volume was made up to 100 mL. The mass of calcium sulphate formed and the concentration of OH in resulting solution, respectively, are : (Molar mass of Ca (OH)2, Na2SO4 and CaSO4 are 74, 143 and 136 g mol–1 , respectively; Ksp of Ca(OH)2 is 5.5 × 10–6 )
A
13.6g, 0.28 mol L$$-$$1
B
13.6g, 0.14 mol L$$-$$1
C
1.9g, 0.28 mol L$$-$$1
D
1.9g, 0.14 mol L$$-$$1
2
JEE Main 2019 (Online) 10th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Hall- Heroult's process is given by :
A
Cu2+ (aq) + H2(g) $$ \to $$ Cu(s) + 2H+ (aq)
B
Cr2O3 + 2AI  $$ \to $$ Al2O3 + 2Cr
C
2Al2O3 + 3C  $$ \to $$ 4Al + 3CO2
D
ZnO + C   $$\buildrel {Coke,\,1673\,K} \over \longrightarrow $$ Zn + CO
3
JEE Main 2019 (Online) 10th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Which premitive unit cell has unequal edge lengths (a $$ \ne $$ b $$ \ne $$ c) and all axial angles different from 90o?
A
Hexagonal
B
Tetragonal
C
Triclinic
D
Monoclinic
4
JEE Main 2019 (Online) 10th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The metal used for marking X–ray tube window is :
A
Ca
B
Na
C
Mg
D
Be
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