1
MHT CET 2024 10th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

Calculate rate constant of first order reaction if concentration of reactant decreases by $90 \%$ in 30 minute?

A
$2.16 \times 10^{-2} \mathrm{~min}^{-1}$
B
$3.52 \times 10^{-2} \mathrm{~min}^{-1}$
C
$4.81 \times 10^{-2} \mathrm{~min}^{-1}$
D
$ 7.67 \times 10^{-2} \mathrm{~min}^{-1}$
2
MHT CET 2024 10th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

Identify the correct decreasing order of $\mathrm{pK}_{\mathrm{b}}$ values of compounds from following.

A
$\mathrm{NH}_3>\mathrm{R}-\mathrm{NH}_2>\mathrm{R}_2 \mathrm{NH}$
B
$\mathrm{R}_2 \mathrm{NH}>\mathrm{R}-\mathrm{NH}_2>\mathrm{NH}_3$
C
$\mathrm{R}-\mathrm{NH}_2>\mathrm{R}_2 \mathrm{NH}>\mathrm{NH}_3$
D
$\mathrm{R}_2 \mathrm{NH}>\mathrm{NH}_3>\mathrm{R}-\mathrm{NH}_2$
3
MHT CET 2024 10th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

Identify the instrument used to find the structure of surface of material.

A
Scanning electron microscope
B
X ray difractometer
C
Transmission electron microscope
D
UV-visible spectrophotometer
4
MHT CET 2024 10th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

Which of the following equations indicates increase in entropy?

A
$\mathrm{CaO}_{(\mathrm{s})}+\mathrm{CO}_{2(\mathrm{~g})} \longrightarrow \mathrm{CaCO}_{3(\mathrm{~s})}$
B
$\mathrm{NaCl}_{(\mathrm{aq})} \longrightarrow \mathrm{NaCl}_{(\mathrm{s})}$
C
$\mathrm{NaNO}_{3(\mathrm{~s})} \longrightarrow \mathrm{Na}_{(\mathrm{aq})}^{+}+\mathrm{NO}_{3(\mathrm{aq})}^{-}$
D
$\mathrm{N}_{2(\mathrm{~g})}+3 \mathrm{H}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{NH}_{3(\mathrm{~g})}$
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