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

If 2 moles of $$\mathrm{C}_6 \mathrm{H}_6(\mathrm{~g})$$ are completely burnt $$4100 \mathrm{~kJ}$$ of heat is liberated. If $$\Delta H^{\circ}$$ for $$\mathrm{CO}_2(\mathrm{~g})$$ and $$\mathrm{H}_2 \mathrm{O}(l)$$ are $$-410$$ and $$-285 \mathrm{~kJ}$$ per mole respectively then the heat of formation of $$\mathrm{C}_2 \mathrm{H}_6(g)$$ is

A
$$-116 \mathrm{~kJ}$$
B
$$-375 \mathrm{~kJ}$$
C
$$-775 \mathrm{~kJ}$$
D
$$-885 \mathrm{~kJ}$$
2
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Abnormal colligative properties are observed only when the dissolved non-volatile solute in a given dilute solution

A
is a non-electrolyte
B
offers an intense colour
C
associates and dissociates
D
offers no colour
3
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Aqueous $$\mathrm{CuSO}_4$$ changes its colour from sky blue to deep blue on addition of $$\mathrm{NH}_3$$ because

A
$$\mathrm{Cu}^{2+}$$ forms hydrate
B
$$\mathrm{Cu}^{2+}$$ changes to $$\mathrm{Cu}^{+}$$
C
$$\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_4\right]^{2+}$$ is labile complex and changes to $$\left[\mathrm{Cu}\left(\mathrm{NH}_3\right)_4\right]^{2+}$$ as $$\mathrm{NH}_3$$ is stronger ligand than $$\mathrm{H}_2 \mathrm{O}$$
D
$$\mathrm{Cu}^{+}$$ changes to $$\mathrm{Cu}^{2+}$$
4
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

COMEDK 2023 Morning Shift Chemistry - Haloalkanes and Haloarenes Question 12 English

Identify A, B and C.

A
COMEDK 2023 Morning Shift Chemistry - Haloalkanes and Haloarenes Question 12 English Option 1
B
COMEDK 2023 Morning Shift Chemistry - Haloalkanes and Haloarenes Question 12 English Option 2
C
COMEDK 2023 Morning Shift Chemistry - Haloalkanes and Haloarenes Question 12 English Option 3
D
COMEDK 2023 Morning Shift Chemistry - Haloalkanes and Haloarenes Question 12 English Option 4
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