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

$$5.8 \mathrm{~g}$$ of a gas maintained at $$95^{\circ} \mathrm{C}$$ occupies the same volume as $$0.368 \mathrm{~g}$$ of hydrogen gas maintained at a temperature of $$17^{\circ} \mathrm{C}$$ and pressure being the same atmospheric pressure for both the gases. What is the molecular mass of the unknown gas?

A
44 g/mol
B
32 g/mol
C
71 g/mol
D
40 g/mol
2
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

A first order reaction proceeds to $$90 \%$$ completion. What will be the approximate time taken for $$90 \%$$ completion in relation to $$t_{1 / 2}$$ of the reaction?

A
5.02 times of $$\mathrm{t}_{1 / 2}$$
B
4.54 times of $$\mathrm{t}_{1 / 2}$$
C
5.66 times of $$\mathrm{t}_{1 / 2}$$
D
3.32 times of $$\mathrm{t}_{1 / 2}$$
3
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

What would be the volume of water required to dissolve $$0.2 \mathrm{~g}$$ of $$\mathrm{PbCl}_2$$ of molar mass $$278 \mathrm{~g} / \mathrm{mol}$$ to prepare a saturated solution of the salt? $$(\mathrm{K}_{\mathrm{SP}}$$ of $$\mathrm{PbCl}_2=3.2 \times 10^{-8})$$

A
1000 ml
B
359.7 ml
C
278.8 ml
D
360.4 ml
4
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Which one of the following compounds would not undergo Aldol condensation?

A
Phenyl ethanal
B
1- Phenyl propanone.
C
2,2-Dimethyl butanal
D
2- Methyl pentanal
EXAM MAP