1
JEE Main 2018 (Online) 15th April Evening Slot
+4
-1
Given

(i)   2Fe2O3(s) $$\to$$ 4Fe(s) + 3O2(g);

$$\Delta$$rGo = + 1487.0 kJ mol-1

(ii)   2CO(g) + O2(g) $$\to$$ 2CO2(g);

$$\Delta$$rGo = $$-$$ 514.4 kJ mol-1

Free energy change, $$\Delta$$rGo for the reaction

2Fe2O3(s) + 6CO(g) $$\to$$ 4Fe(s) + 6CO2(g) will be :
A
$$-$$ 112.4 kJ mol-1
B
$$-$$ 56.2 kJ mol-1
C
$$-$$ 168.2 kJ mol-1
D
$$-$$ 208.0 kJ mol-1
2
JEE Main 2018 (Online) 15th April Evening Slot
+4
-1
$$\Delta$$fGo at 500 K for substance 'S' in liquid state and gaseous state are +100.7 kcl mol-1 and +103 kcal mol-1, respectively. Vapour pressure of liquid 'S' at 500 K is approximately equal to : ( R = 2 cal K-1 mol-1 )
A
0.1 atm
B
1 atm
C
10 atm
D
100 atm
3
JEE Main 2018 (Online) 15th April Evening Slot
+4
-1
Following four solutions are prepared by mixing different volumes of NaOH and HCl of different concentrations, pH of which one of them will be equal to 1 ?
A
100 mL $${M \over {10}}$$ HCl + 100 mL $${M \over {10}}$$ NaOH
B
75 mL $${M \over {5}}$$ HCl + 25 mL $${M \over {5}}$$ NaOH
C
60 mL $${M \over {10}}$$ HCl + 40 mL $${M \over {10}}$$ NaOH
D
55 mL $${M \over {10}}$$ HCl + 45 mL $${M \over {10}}$$ NaOH
4
JEE Main 2018 (Online) 15th April Evening Slot
+4
-1
Biochemical Oxygen Demand (BOD) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct ?
A
Aerobic bacteria decrease the BOD value.
B
Anaerobic bacteria increase the BOD value.
C
Clean water has BOD value higher than 10 ppm.
D
Polluted water has BOD value higher than 10 ppm.
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