Chemistry Test

Question 1
1 / -0

Following solutions were prepared by mixing different volumes of \(\mathrm{NaOH}\) and \(\mathrm{HCl}\) of different concentrations:

a.\(60 \mathrm{~mL} \frac{\mathrm{M}}{10} \mathrm{HCl}+40 \mathrm{~mL} \frac{\mathrm{M}}{10} \mathrm{NaOH}\)

b.\(55 \mathrm{~mL} \frac{\mathrm{M}}{10} \mathrm{HCl}+45 \mathrm{~mL} \frac{\mathrm{M}}{10} \mathrm{NaOH}\)

c.\(75 \mathrm{~mL} \frac{\mathrm{M}}{5} \mathrm{HCl}+25 \mathrm{~mL} \frac{\mathrm{M}}{5} \mathrm{NaOH}\)

d.\(100 \mathrm{~mL} \frac{\mathrm{M}}{10} \mathrm{HCl}+100 \mathrm{~mL} \frac{\mathrm{M}}{10} \mathrm{NaOH}\)

\(\mathrm{pH}\) of which one of them will be equal to \(1\)?

A
d

B
a

C
b

D
c

Question 2
1 / -0

Which of the following is the energy of a possible excited state of hydrogen?

A
\(+13.6 \mathrm{eV}\)

B
\(-6.8 \mathrm{eV}\)

C
\(-3.4 \mathrm{eV}\)

D
\(+6.8 \mathrm{eV}\)

Question 3
1 / -0

A and B decompose via first order kinetics with half-lives 54.0 min and 18.0min respectively. Starting from an equimolar non-reactive mixture of A and B, the time taken for the concentration of A to become 16 times that of B is ......... min. (Round off to the nearest integer).

A
120

B
98

C
108

D
88

Question 4
1 / -0

The correct representation of 4- hydroxy- 2-methylpent-2-en-1-al is:

A

\({ CH }_{ 3 }-\underset { \overset { | }{ OH } }{ CH } -CH=\underset { \overset { | }{ { CH }_{ 3 } } }{ C } -CHO\)

B
\({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } -CH=\underset { \overset { | }{ OH } }{ C } -CHO\)

C

\({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ \overset { \underset { | }{ { CH }_{ 3 } } }{ C } } -CH=\underset { \overset { | }{ { CH }_{ 3 } } }{ C } -CHO\)

D

\({ CH }_{ 3 }-\underset { \overset { | }{ { OH } } }{ CH } -{ { CH }_{ 2 } }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } -CHO\)

Question 5
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Which one of the following is included in essential amino acids?

A
Valine

B
Tryptophan

C
Leucine

D
All of the above

Question 6
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Which of the following is a molecular solid?

A
\(I_{2}\)

B
Solid \(\mathrm{NH}_{3}\)

C
Ice

D
All of these

Question 7
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Which of the following statement is correct?

A
The \(\mathrm{C}-\mathrm{X}\) bond in haloalkanes is more polar than the \(\mathrm{C}-\mathrm{X}\) in haloarenes.

B
The \(\mathrm{C}-\mathrm{X}\) bond in haloalkanes is less polar than the \(\mathrm{C}-\mathrm{X}\) in haloarenes.

C
Polarity of \(\mathrm{C}-\mathrm{X}\) bond in haloalkane is equal to the polarity of \(\mathrm{C}-\mathrm{X}\) bond in haloarenes.

D
Polarity of \(\mathrm{C}-\mathrm{X}\) bond in both depends on conditions.

Question 8
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At a particular temperature, the vapour pressures of two liquids A and B are 120 mm and 180 mm of mercury respectively. If 2 moles of A and 3 moles of B are mixed to form an ideal solution, the vapour pressure of the solution at the same temperature will be: (in mm of mercury)

A
156

B
145

C
150

D
108

Question 9
1 / -0

The incorrect statement about physical adsorption is that:

A
It lacks specificity

B
It is generally reversible

C
Porous surfaces are good adsorbent

D
Heat of adsorption is quite high

Question 10
1 / -0

In the presence of a catalyst, the heat evolved or absorbed during the reaction _______.

A
Increases

B
Decreases

C
Remains unchanged

D
May increase or decrease

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Chemistry Test ...

Question 1

d

a

b

c

Question 2

\(+13.6 \mathrm{eV}\)

\(-6.8 \mathrm{eV}\)

\(-3.4 \mathrm{eV}\)

\(+6.8 \mathrm{eV}\)

Question 3

120

98

108

88

Question 4

\({ CH }_{ 3 }-\underset { \overset { | }{ OH } }{ CH } -CH=\underset { \overset { | }{ { CH }_{ 3 } } }{ C } -CHO\)

\({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } -CH=\underset { \overset { | }{ OH } }{ C } -CHO\)

\({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ \overset { \underset { | }{ { CH }_{ 3 } } }{ C } } -CH=\underset { \overset { | }{ { CH }_{ 3 } } }{ C } -CHO\)

\({ CH }_{ 3 }-\underset { \overset { | }{ { OH } } }{ CH } -{ { CH }_{ 2 } }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } -CHO\)

Question 5

Valine

Tryptophan

Leucine

All of the above

Question 6

\(I_{2}\)

Solid \(\mathrm{NH}_{3}\)

Ice

All of these

Question 7

The \(\mathrm{C}-\mathrm{X}\) bond in haloalkanes is more polar than the \(\mathrm{C}-\mathrm{X}\) in haloarenes.

The \(\mathrm{C}-\mathrm{X}\) bond in haloalkanes is less polar than the \(\mathrm{C}-\mathrm{X}\) in haloarenes.

Polarity of \(\mathrm{C}-\mathrm{X}\) bond in haloalkane is equal to the polarity of \(\mathrm{C}-\mathrm{X}\) bond in haloarenes.

Polarity of \(\mathrm{C}-\mathrm{X}\) bond in both depends on conditions.

Question 8

156

145

150

108

Question 9

It lacks specificity

It is generally reversible

Porous surfaces are good adsorbent

Heat of adsorption is quite high

Question 10

Increases

Decreases

Remains unchanged

May increase or decrease

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