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

What is the mole fraction of solute in a $$5 \mathrm{~m}$$ aqueous solution?

A
0.038
B
0.593
C
0.082
D
0.751
2
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Identify the reagents $$\mathrm{X}, \mathrm{Y}$$ and $$\mathrm{Z}$$ used to bring out the following reactions.

COMEDK 2023 Evening Shift Chemistry - Hydrocarbons Question 6 English

A
$$ \mathrm{X}=\text { Alkaline } \mathrm{KMnO}_4 \quad \mathrm{Y}=\text { dil } \mathrm{HCl} \quad \mathrm{Z}=\mathrm{CrO}_3 $$
B
$$ \mathrm{X}=\text { Air } \quad \mathrm{Y}=\text { dil. } \mathrm{H}_2 \mathrm{SO}_4 \quad \mathrm{Z}=\mathrm{Cr}_2 \mathrm{O}_7{ }^{2-} / \mathrm{H}^{+} $$
C
$$ \mathrm{X}=\mathrm{H}_2 \mathrm{O}_2 \quad \mathrm{Y}=\text { Conc. } \mathrm{HCl} \quad \mathrm{Z}=\mathrm{O}_3 $$
D
$$ \mathrm{X}=\text { DIBAL- } \mathrm{H} \quad \mathrm{Y}=\text { Conc. } \mathrm{HNO}_3 \quad \mathrm{Z}=\mathrm{CrO}_2 \mathrm{Cl}_2 $$
3
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

A proton having mass equal to $$1.66 \times 10^{-27} \mathrm{~kg}$$ is accelerated to one tenth of the velocity of light. If its velocity can be measured to an accuracy of $$\pm 2 \%$$, what would be the uncertainty in its position?

A
$$7.9 \times 10^{-5} \mathrm{~m}$$
B
$$5.29 \times 10^{-14} \mathrm{~m}$$
C
$$6.0 \times 10^{-5} \mathrm{~m}$$
D
$$1.06 \times 10^{-13} \mathrm{~m}$$
4
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Match the details given in Column I with those given in Column II

S.No. Column I S.No. Column II
A For complex reactions order is determined by P Rate of reaction.
B For Zero order reaction unit of $\mathrm{k}$ is same as that of Q Slope $$=k/2.303$$
C Mathematical expression which gives relationship between rate of reaction and concentrations of reactants is called R Slowest rate determining step.
D For a first order reaction plot of $$\mathrm{\log \left[R_0\right] /[R]}$$ vs time gives S Rate law.

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