1
JEE Main 2017 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Identify the pollutant gases largely responsible for the discoloured and lustreless nature of marble of the Taj Mahal.
A
O3 and CO2
B
CO2 and NO2
C
SO2 and NO2
D
SO2 and O3
2
JEE Main 2017 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
In which of the following reactions, hydrogen peroxide acts as an oxidizing agent ?
A
HOCl + H2O2 $$ \to $$ H3O+ + Cl$$-$$ + O2
B
I2 + H2O2 + 2OH$$-$$ $$ \to $$ 2I$$-$$ + 2H2O + O2
C
2Mn$$O_4^ - $$ + 3H2O2 $$ \to $$ 2 MnO2 + 3O2 + 2H2O + 2OH$$-$$
D
PbS + 4H2O2 $$ \to $$ PbSO4 + 4H2O
3
JEE Main 2017 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Consider the following ionization enthalpies of two elements 'A' and 'B' .

Element Ionization enthalpy (kJ/mol)
1st 2nd 3rd
A 899 1757 14847
B 737 1450 7731


Which of the following statements is correct ?
A
Both ‘A’ and ‘B’ belong to group-1where ‘B’ comes below ‘A’.
B
Both ‘A’ and ‘B’ belong to group-1 where ‘A’ comes below ‘B’.
C
Both ‘A’ and ‘B’ belong to group-2 where ‘B’ comes below ‘A’.
D
Both ‘A’ and ‘B’ belong to group-2 where ‘A’ comes below ‘B’.
4
JEE Main 2017 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Consider the following standard electrode potentials (Eo in volts) in aqueous solution :

Element M3+ /M M+ /M
A1 -1.66 + 0.55
T1 +1.26 - 0.34


Based on these data, which of the following statements is correct ?
A
T1+ is more stable than A13+
B
A1+ is more stable than A13+
C
T1 + is more stable than A1+
D
T13+ is more stable than A13+
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