1
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
The electronic configuration of the element with atomic number 78 is :
A
$[X e] 4 f^{14} 5 d^9 6 s^1$
B
$[K r] 4 f^{14} 5 d^8 6 s^2$
C
$[\mathrm{Xe}] 4 f^{14} 5 d^{10}$
D
$[K r] 4 f^{14} 5 d^{10}$
2
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Identify the final product $[\mathrm{Y}]$ in the following reaction.

COMEDK 2025 Evening Shift Chemistry - Compounds Containing Nitrogen Question 1 English

A
COMEDK 2025 Evening Shift Chemistry - Compounds Containing Nitrogen Question 1 English Option 1
B
COMEDK 2025 Evening Shift Chemistry - Compounds Containing Nitrogen Question 1 English Option 2
C
COMEDK 2025 Evening Shift Chemistry - Compounds Containing Nitrogen Question 1 English Option 3
D
COMEDK 2025 Evening Shift Chemistry - Compounds Containing Nitrogen Question 1 English Option 4
3
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
Choose the incorrect statement.
A
Cresols are less acidic than Phenol because electron releasing groups do not favour formation of Phenoxide ion.
B
Ethanol acts as Nucleophile when the $\mathrm{O}-\mathrm{H}$ bond is broken and acts as Electrophile on getting protonated.
C
In the acid catalysed hydration of Ethene, an Oxonium ion is formed when it reacts with $\mathrm{H}_3 \mathrm{O}^{+}$and a Carbocation is formed when the Oxonium ion reacts with water.
D
In the reaction between Ethanol and Conc. $\mathrm{H}_2 \mathrm{SO}_4$ at 413 K , an Oxonium ion is formed when Ethanol gets protonated.
4
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Find the correct matches.

A. $\mathrm{Cr}_2 \mathrm{O}_7^{2-}$ P. is predominantly a basic compound.
B. $\mathrm{FeCr}_2 \mathrm{O}_4$ Q. is predominantly a acidic compound
C. $\mathrm{CrO}_3$ R. forms yellow chromate on reaction with $\mathrm{Na}_2 \mathrm{CO}_3$ in air.
D. $\mathrm{CrO}$ S. is interconvertible with $\mathrm{MO}_4^{2-}$ depending on the pH of the medium.

A
$\mathrm{A}=\mathrm{R} \quad \mathrm{B}=\mathrm{S} \quad \mathrm{C}=\mathrm{P} \quad \mathrm{D}=\mathrm{Q}$
B
$\mathrm{A}=\mathrm{S} \quad \mathrm{B}=\mathrm{R} \quad \mathrm{C}=\mathrm{P} \quad \mathrm{D}=\mathrm{Q}$
C
$\mathrm{A}=\mathrm{R} \quad \mathrm{B}=\mathrm{Q} \quad \mathrm{C}=\mathrm{S} \quad \mathrm{D}=\mathrm{P}$
D
$\mathrm{A}=\mathrm{S} \quad \mathrm{B}=\mathrm{R} \quad \mathrm{C}=\mathrm{Q} \quad \mathrm{D}=\mathrm{P}$
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