1
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
The oxidation number of potassium in $\mathrm{K}_2 \mathrm{O}, \mathrm{K}_2 \mathrm{O}_2$ and $\mathrm{KO}_2$ respectively are:
A
$+1,+2,+4$
B
$+1,+2,+1$
C
$+1,+1,+1$
D
$+2,+1,+1$
2
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
For a cell $2 \mathrm{M}_{(\mathrm{S})}+\mathrm{O}_2(\mathrm{~g})+4 \mathrm{H}^{+} \rightarrow 2 \mathrm{M}^{2+}(\mathrm{aq})+2 \mathrm{H}_2 \mathrm{O}_{(\mathrm{l})}$ the $\mathrm{E}^0$ cell $=+1.67 \mathrm{~V}$. When $\left[\mathrm{M}^{2+}\right]$ is $1.0 \times 10^{-3} \mathrm{M}$ and $\mathrm{p}\left(\mathrm{O}_2\right)$ is 0.1 atm , the EMF of the cell becomes +1.57 V . Calculate the pH of the electrochemical cell.
A
3.49
B
2.95
C
5.24
D
12.01
3
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0

What would be the major product formed in the reaction?

COMEDK 2025 Evening Shift Chemistry - Hydrocarbons Question 2 English

A
COMEDK 2025 Evening Shift Chemistry - Hydrocarbons Question 2 English Option 1
B
COMEDK 2025 Evening Shift Chemistry - Hydrocarbons Question 2 English Option 2
C
COMEDK 2025 Evening Shift Chemistry - Hydrocarbons Question 2 English Option 3
D
COMEDK 2025 Evening Shift Chemistry - Hydrocarbons Question 2 English Option 4
4
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0

When $0.1 \mathrm{~mol} \mathrm{~L}^{-1}$ of KCl was filled in a Conductivity cell the resistance was 80 ohms at 298 K . (Conductivity of 0.1 M KCl at 298 K is $1.29 \mathrm{~S} \mathrm{~m}^{-1}$. The same cell when filled with an unknown electrolyte of concentration 0.025 M , had a resistance of 92 ohms. What is the Molar conductivity of the electrolyte at the given concentration?

A
$220.6 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$
B
$0.2206 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$
C
$448 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$
D
$0.449 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$
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