1
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
2
JEE Main 2019 (Online) 12th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
A metal on combustion in excess air forms X. X upon hydrolysis with water yields H2O2 and O2 along with another product. The metal is -
A
Rb
B
Mg
C
Na
D
Li
3
JEE Main 2019 (Online) 11th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Match the following items in column I with the corresponding items in column II.

Item I Item II
(i) Na2CO3.10H2O (A) Portland cement ingredient
(ii) Mg(HCO3)2 (B) Castner-Kellner process
(iii) NaOH
(C) Solvay process
(iv) Ca3Al2O6 (D) Temporary hardness
A
(i)$$ \to $$(D); (ii)$$ \to $$(A); (iii)$$ \to $$(B); (iv)$$ \to $$(C)
B
(i)$$ \to $$(B); (ii)$$ \to $$(C); (iii)$$ \to $$(A); (iv)$$ \to $$(D)
C
(i)$$ \to $$(C); (ii)$$ \to $$(B); (iii)$$ \to $$(D); (iv)$$ \to $$(A)
D
(i)$$ \to $$(C); (ii)$$ \to $$(D); (iii)$$ \to $$(B); (iv)$$ \to $$(A)
4
JEE Main 2019 (Online) 11th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
The reaction that does NOT define calcination is :
A
2Cu2S + 3O2 $$\buildrel \Delta \over \longrightarrow $$ 2Cu2O + 2SO2
B
CaCO3 . MgCO3 $$\buildrel \Delta \over \longrightarrow $$ CaO + MgO + 2CO2
C
ZnCO3 $$\buildrel \Delta \over \longrightarrow $$ ZnO + CO2
D
Fe2O3 . XH2O $$\buildrel \Delta \over \longrightarrow $$ Fe2O3 + XH2O
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