1
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

An aromatic hydrocarbon $$[\mathrm{A}]\left(\mathrm{Molecular}\right.$$ formula $$\left.\mathrm{C}_9 \mathrm{H}_{12}\right)$$, undergoes air oxidation followed by reaction with dil. $$\mathrm{HCl}$$ to give [B] as one of the products

Compound [B] forms a white precipitate on treatment with $$\mathrm{Br}_2(\mathrm{aq})$$

Sodium salt of [B] reacts with $$\mathrm{CO}_2$$ at $$400 \mathrm{~K}$$ under high pressure followed by acid hydrolysis to give [C]

Compound [C] reacts with acetic anhydride / conc. $$\mathrm{H}_2 \mathrm{SO}_4$$ to form [D] Identify compound $$[\mathrm{D}]$$

A
COMEDK 2024 Morning Shift Chemistry - Hydrocarbons Question 17 English Option 1
B
COMEDK 2024 Morning Shift Chemistry - Hydrocarbons Question 17 English Option 2
C
COMEDK 2024 Morning Shift Chemistry - Hydrocarbons Question 17 English Option 3
D
COMEDK 2024 Morning Shift Chemistry - Hydrocarbons Question 17 English Option 4
2
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A given chemical reaction is represented by the following stoichiometric equation.

$$3 X+2 Y+\frac{5}{2} Z \rightarrow P_1+P_2+P_3$$

The rate of reaction can be expressed as _________.

A
$$\frac{2}{3}\left(\frac{d[X]}{d t}\right)=\left(\frac{d[Y]}{d t}\right)=\frac{4}{5}\left(\frac{d[Z]}{d t}\right)$$
B
$$\frac{3}{2}\left(\frac{d[X]}{d t}\right)=\frac{1}{4}\left(\frac{d[Y]}{d t}\right)=\frac{8}{5}\left(\frac{d[Z]}{d t}\right)$$
C
$$\frac{4}{15}\left(\frac{d[X]}{d t}\right)=\frac{4}{5}\left(\frac{d[Y]}{d t}\right)=\frac{8}{15}\left(\frac{d[Z]}{d t}\right)$$
D
$$\left(\frac{d[X]}{d t}\right)=\frac{3}{2}\left(\frac{d[Y]}{d t}\right)=\frac{15}{4}\left(\frac{d[Z]}{d t}\right)$$
3
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Match the chemical reactions taking place at the Anode of the cell with the correct cell in which the reaction occurs.

No. Anodic reaction No. Cell
A $$
\mathrm{Zn}(\mathrm{Hg})+2 \mathrm{OH}^{-} \rightarrow \mathrm{ZnO}_{(\mathrm{S})}+\mathrm{H}_2 \mathrm{O}+2 e
$$
P Fuel cell
B $$
2 \mathrm{H}_2(g)+4 \mathrm{OH}^{-} \rightarrow 4 \mathrm{H}_2 \mathrm{O}(l)+4 e
$$
Q Leclanche cell
C $$
Z n_{(S)} \rightarrow Z n^{2+}+2 e
$$
R Nickel Cadmium storage cell
D $$
\mathrm{Cd}_{(S)}+2 \mathrm{OH}^{-} \rightarrow \mathrm{CdO}_{(S)}+\mathrm{H}_2 \mathrm{O}(l)+2 e
$$
S Mercury cell

A
$$ \mathrm{A}=\mathrm{Q} \quad \mathrm{B}=\mathrm{S} \quad \mathrm{C}=\mathrm{P} \quad \mathrm{D}=\mathrm{R} $$
B
$$ \mathrm{A}=\mathrm{S} \quad \mathrm{B}=\mathrm{P} \quad \mathrm{C}=\mathrm{R} \quad \mathrm{D}=\mathrm{Q} $$
C
$$ \mathrm{A}=\mathrm{S} \quad \mathrm{B}=\mathrm{R} \quad \mathrm{C}=\mathrm{Q} \quad \mathrm{D}=\mathrm{P} $$
D
$$ \mathrm{A}=\mathrm{S} \quad \mathrm{B}=\mathrm{P} \quad \mathrm{C}=\mathrm{Q} \quad \mathrm{D}=\mathrm{R} $$
4
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

If the enthalpy of formation of a diatomic molecule $$\mathrm{AB}$$ is $$-400 \mathrm{~kJ} / \mathrm{mol}$$ and the bond dissociation energies of $$\mathrm{A}_2$$ and $$\mathrm{B}_2$$ and $$\mathrm{AB}$$ are in the ratio $$2: 1: 2$$, what is the bond dissociation enthalpy of $$\mathrm{B}_2$$ ?

A
800 kJ/mol
B
600 kJ/mol
C
1600 kJ/mol
D
400 kJ/mol
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