1
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Identify the catalyst used in the reaction between Iodide and persulphate ions.

$$2 \mathrm{I}^{-}+\mathrm{S}_2 \mathrm{O}_8{ }^{2-} \rightarrow \mathrm{I}_2+2 \mathrm{SO}_4{ }^{2-}$$

A
$$\mathrm{Cr}^{3+}$$
B
$$\mathrm{Fe}^{3+}$$
C
$$\mathrm{Ni}^{2+}$$
D
$$\mathrm{Fe}^{2+}$$
2
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Find the correct matches of the substances, given in Column I, from their characteristic properties given in Column II.

S.No. Column I S.No. Column II
W $$
\mathrm{Tl}
$$
A Decomposes steam to form its dioxide and dihydrogen gas.
X $$
\mathrm{CCl}_4
$$
B Consists of twenty 6 -membered rings and twelve 5 membered rings.
Y $$\mathrm{Tin}$$ C +3 oxidation state is highly oxidising.
Z $$
\mathrm{C_{60}}
$$
D Electron precise species, neither acts as electron donor nor as electron acceptor.

A
$$ \mathrm{W}=\mathrm{C} \quad \mathrm{X}=\mathrm{D} \quad \mathrm{Y}=\mathrm{A} \quad \mathrm{Z}=\mathrm{B} $$
B
$$ \mathrm{W}=\mathrm{B} \quad \mathrm{X}=\mathrm{D} \quad \mathrm{Y}=\mathrm{C} \quad \mathrm{Z}=\mathrm{A} $$
C
$$ \mathrm{W}=\mathrm{D} \quad \mathrm{X}=\mathrm{C} \quad \mathrm{Y}=\mathrm{A} \quad \mathrm{Z}=\mathrm{B} $$
D
$$ \mathrm{W}=\mathrm{D} \quad \mathrm{X}=\mathrm{C} \quad \mathrm{Y}=\mathrm{B} \quad \mathrm{Z}=\mathrm{A} $$
3
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

A Gas taken in a closed vessel is heated from $$54^{\circ} \mathrm{C}$$ to $$1254^{\circ} \mathrm{C}$$. The pressure of the gas becomes ___________ times its original pressure $$\mathrm{P_1}$$

A
8.92 times $$\mathrm{P_1}$$
B
23.2 times $$\mathrm{P_1}$$
C
4.67 times $$\mathrm{P_1}$$
D
9.6 times $$\mathrm{P_1}$$
4
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Which one of the following correctly represents the decreasing order of acidic nature of the given carboxylic acids:

[A] 2-Hydroxybenzoic acid

[B] Benzoic acid

[C] 3-Hydroxybenzoic acid

[D] 4- Hydroxybenzoic acid

A
$$ [\mathrm{D}]>[\mathrm{C}]>[\mathrm{B}]>[\mathrm{A}] $$
B
$$ [\mathrm{A}]>[\mathrm{C}]>[\mathrm{B}]>[\mathrm{D}] $$
C
$$ [\mathrm{D}]>[\mathrm{B}]>[\mathrm{C}]>[\mathrm{A}] $$
D
$$ [\mathrm{B}]>[\mathrm{A}]>[\mathrm{C}]>[\mathrm{D}] $$
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