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1
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
A hydrated solid X on heating initially gives a monohydrated compound Y. Y upon heating above 373 K leads to an anhydrous white powder Z. X and Z, respectively, are :
A
Baking soda and dead burnt plaster.
B
Washing soda and soda ash
C
Washing soda and dead burnt plaster.
D
Baking soda and soda as.
2
JEE Main 2019 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
The alloy used in the construction of aircrafts is :
A
Mg – Zn
B
Mg – Al
C
Mg – Mn
D
Mg – Sn
3
JEE Main 2019 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Magnisium powder burns in air to give:
A
MgO and Mg3N2
B
MgO only
C
Mg(NO3)2 and Mg3N2
D
MgO and Mg(NO3)2
4
JEE Main 2019 (Online) 12th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
The correct statement (s) among I to III with respect to potassium ions that are abundant within the cell fluid is /are
I. They activate many enzymes
II. They participate in the oxidation of glucose to produce ATP
III. Along with sodium ions they are responsible for the transmission of nerve signals
A
III only
B
I and II only
C
I and III only
D
I, II and III only
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