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Chemistry MCQ

States of Matter · Maharashtra Board STD 11 Science (MSBSHSE - English Medium). 32 questions.

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32 questions · auto-graded multiple-choice test.

MCQ 11 Mark
Which of the following molecules has intramolecular hydrogen bonding?
  • A
    Ammonia
  • ✓
    Ethylene glycol
  • C
    Hydrogen fluoride
  • D
    Water
Answer
Correct option: B.
Ethylene glycol
B
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MCQ 21 Mark
Calculate the number of moles of the gas having volume 2.5 liter at $300 \mathrm{~K}$ and $4.5 \mathrm{~atm} ?\left(\mathrm{R}=0.0821 \mathrm{~atm} \mathrm{dm}^3 \mathrm{~K}^{-1} \mathrm{~mol}^{-1}\right)$
  • A
    0.56
  • ✓
    0.46
  • C
    0.62
  • D
    0.70
Answer
Correct option: B.
0.46
B
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MCQ 31 Mark
Which among the following molecules is non polar?
  • A
    $\mathrm{NH}_3$
  • B
    $\mathrm{HCl}$
  • C
    $\mathrm{I}-\mathrm{Cl}$
  • ✓
    $\mathrm{C}_6 \mathrm{H}_6$
Answer
Correct option: D.
$\mathrm{C}_6 \mathrm{H}_6$
D
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MCQ 41 Mark
If the mixture of $7 \mathrm{~g}$ of $\mathrm{N}_2$ and $8 \mathrm{~g}$ of $\mathrm{Ar}$ in a cylinder has the total pressure 27 bar. What is the partial pressure of $\mathrm{N}_2$ ? (at. mass of $\mathrm{N}=14 \mathrm{~g} \mathrm{~mol}^{-1}, \mathrm{Ar}=40 \mathrm{~g} \mathrm{~mol}^{-1}$ )
  • A
    9 bar
  • ✓
    15 bar
  • C
    12 bar
  • D
    18 bar
Answer
Correct option: B.
15 bar
B
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MCQ 51 Mark
Which of the following gases is difficult to liquify?
  • A
    $\mathrm{SO}_2$
  • B
    $\mathrm{NH}_3$
  • ✓
    $\mathrm{O}_2$
  • D
    $\mathrm{Cl}_2$
Answer
Correct option: C.
$\mathrm{O}_2$
C
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MCQ 61 Mark
Calculate the new volume of a gas at constant pressure when temperature is increased to $546 \mathrm{~K}$. [Initial volume of a gas at $273 \mathrm{~K}$ is $4 \mathrm{dm}^3$ ]
  • A
    $5 \mathrm{dm}^3$
  • B
    $4 \mathrm{dm}^3$
  • C
    $2 \mathrm{dm}^3$
  • ✓
    $8 \mathrm{dm}^3$
Answer
Correct option: D.
$8 \mathrm{dm}^3$
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MCQ 71 Mark
At constant temperature the pressure of $22.4\ dm ^3$ volume of an ideal gas was increased from $10^5\ kPa$ to $210\ kPa$ , New volume could be-
  • A
    $44.8\ dm ^3$
  • ✓
    $11.2\ dm ^3$
  • C
    $22.4\ dm ^3$
  • D
    $5.6\ dm ^3$
Answer
Correct option: B.
$11.2\ dm ^3$
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MCQ 81 Mark
Interactive forces are ………. in ideal gas.
  • ✓
    nil
  • B
    small
  • C
    large
  • D
    same as that of real gases
Answer
Correct option: A.
nil
nil
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MCQ 91 Mark
Intermolecular forces in liquid are
  • A
    greater than gases
  • B
    less than solids
  • ✓
    both a and b
  • D
    greater than solids
Answer
Correct option: C.
both a and b
both a and b
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MCQ 101 Mark
Which of the following is true for 2 moles of an ideal gas ?
  • A
    PV = nRT
  • B
    PV = RT
  • ✓
    PV = 2RT
  • D
    PV = T
Answer
Correct option: C.
PV = 2RT
PV = 2RT
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MCQ 121 Mark
At $0^{\circ} C$ a gas occupies 22.4 liters. What is the temperature in Kelvin to reach the volume of 224 liters?
  • A
    $546 K$
  • B
    $273 K$
  • ✓
    $2730 K$
  • D
    $5460 K$
Answer
Correct option: C.
$2730 K$
(c) : $V_1=$ Initial volume of gas $=22.4 L$
$T_1=$ Initial temperature $=0+273.15=273.15 K$
$V_2=$ Final volume $=224 L$
$T_2=$ Final temperature
According to Charles' law, $\frac{V_1}{T_1}=\frac{V_2}{T_2}$
$
T_2=\frac{V_2 \times T_1}{V_1}=\frac{224 L \times 273.15 K }{22.4 L }=2731.5 K
$
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MCQ 131 Mark
An ideal gas expands by performing $200 J$ of work, during this internal energy increases by $432 J$. What is enthalpy change?
  • A
    $200 J$
  • ✓
    $232 J$
  • C
    $432 J$
  • D
    $632 J$
Answer
Correct option: B.
$232 J$
(b): Enthalpy change, $\Delta H=\Delta U+w$ $w=-200 J$ (work done by the gas) and $\Delta U=432 J$
$
\Delta H=-200 J +432 J =232 J
$
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MCQ 141 Mark
A neon-dioxygen mixture contains $64 g O _2$ and $160 g$ Ne. If the total pressure is 25 bar, calculate the partial pressure of dioxygen.
  • ✓
    5 bar
  • B
    7.5 bar
  • C
    $10 bar$
  • D
    $20 bar$
Answer
Correct option: A.
5 bar
(a): $m_{ O _2}=64 g ; m_{ Ne }=160 g ; P_T=25$ bar $n_{ O _2}=\frac{64}{32}=2 mol ; n_{ Ne }=\frac{160}{20}=8 mol$
Total number of moles $\left(n_T\right)=n_{ O _2}+n_{ Ne }=2+8=10 mol$ Mole fraction of $O _2\left(x_{ O _2}\right)=\frac{n_{ O _2}}{n_T}=\frac{2}{10}=0.2$ $p_{ O _2}=\left(x_{ O _2}\right) \times p_{ T }=0.2 \times 25=5$ bar
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MCQ 151 Mark
Find the temperature in degree celsius if volume and pressure of 2 mole ideal gas is $20 dm ^3$ and 4.926 atmosphere respectively. $\left(R=0.0821 dm ^3 atm K ^{-1} mol ^{-1}\right.$ )
  • A
    273
  • ✓
    327
  • C
    600
  • D
    453
Answer
Correct option: B.
327
(b) : $T=?, V=20 dm ^3, P=4.926 atm , n=2 mol$ $P V=n R T$
$
T=\frac{P V}{n R}=\frac{4.926 \times 20}{2 \times 0.0821} \approx 600 K =327^{\circ} C
$
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MCQ 161 Mark
The density of a gas at $27^{\circ} C$ and $1$ atm is $d$. Pressure remaining constant, at which of the following temperatures will its density become $0.75 d\ ?$
  • A
    $20^{\circ} C$
  • B
    $30^{\circ} C$
  • ✓
    $400 K$
  • D
    $300 K$
Answer
Correct option: C.
$400 K$
We know, $\ce{PM=dRT}$
At constant pressure, $d_1 T_1=d_2 T_2$
$d_1=d, T_1=27^{\circ} C =(273+27) K =300 K ,$
$d_2=0.75 d,$
$T_2=?$
$T_2=\frac{d \times 300}{0.75 d}=400 K$
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MCQ 171 Mark
A cold drink bottle contains $200 mL$. liquid in which $CO _2$ is 0.1 molar. Considering $CO _2$ as an ideal gas, the volume of the dissolved $CO _2$ at S.T.P. is
  • A
    $22.4 L$
  • B
    $0.224 L$
  • C
    $2.24 L$
  • ✓
    $0.448 L$
Answer
Correct option: D.
$0.448 L$
(d) : 0.1 molar means $0.1 mol / L$
i.e., 0.1 mole in $1000 mL$. Moles in $200 mL =(0.1 / 1000) \times 200=0.02 mol$ 1 mole of $CO _2$ at S.T.P. $=22.4 L$
0.2 mole of $CO _2=22.4 \times 0.02=0.448 L$
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MCQ 181 Mark
What is the density of water vapour at boiling point of water?
  • A
    $1 \times 10^{-4} g cm ^{-3}$
  • B
    $1 g cm ^{-3}$
  • ✓
    $6 \times 10^{-4} g cm ^{-3}$
  • D
    $4 \times 10^{-4} g cm ^{-3}$
Answer
Correct option: C.
$6 \times 10^{-4} g cm ^{-3}$
(c): Density, $d=P M / R T$
$
=\frac{1 \times 18}{82.1 \times 373}=5.87 \times 10^{-4} g / cm ^3=6 \times 10^{-4} g / cm ^3
$
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MCQ 191 Mark
The SI unit of surface tension is ……………..
  • A
    Pascal
  • B
    $N s m ^{-2}$
  • C
    $km ^{-2} s$
  • ✓
    $N m ^{-1}$
Answer
Correct option: D.
$N m ^{-1}$
(D) $N m ^{-1}$
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MCQ 201 Mark
The highest temperature at which liquid CO2 can exist is ……………..
  • A
    18.98 °C
  • ✓
    38.98 °C
  • C
    50.0 °C
  • D
    73.9 °C
Answer
Correct option: B.
38.98 °C
(B) 38.98 °C
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MCQ 211 Mark
The partial pressure of a gas is obtained by multiplying the total pressure of mixture by …………… of that gas.
  • A
    molar mass
  • B
    moles
  • C
    mass
  • ✓
    mole fraction
Answer
Correct option: D.
mole fraction
(D) mole fraction
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MCQ 221 Mark
When one mole of an ideal gas is heated from 300 K to 360 K at constant pressure of 1 atm, its volume …………….
  • A
    increases from V to 6.0V
  • B
    increases from V to 3.6V
  • ✓
    increases from V to 1.2V
  • D
    increases from V to 1.6V
Answer
Correct option: C.
increases from V to 1.2V
(C) increases from V to 1.2V
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MCQ 231 Mark
Which of the following is CORRECT regarding a fixed amount of ideal gas?
  • ✓
    Doubling the temperature, doubles the volume, provided the pressure remains the same.
  • B
    Doubling the temperature, halves the volume, provided the pressure remains the same.
  • C
    Doubling the pressure, doubles the volume, provided the temperature remains the same.
  • D
    Doubling the volume, doubles the pressure, provided the temperature remains the same.
Answer
Correct option: A.
Doubling the temperature, doubles the volume, provided the pressure remains the same.
(A) Doubling the temperature, doubles the volume, provided the pressure remains the same.
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MCQ 241 Mark
The volume occupied by 11.5 g of carbon dioxide at STP is approximately equal to:
  • ✓
    5.9 L
  • B
    22.5 L
  • C
    86 L
  • D
    259 L
Answer
Correct option: A.
5.9 L
(A) 5.9 L
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MCQ 251 Mark
The number of moles of H2 in 0.224 L of hydrogen gas at STP (273 K, 1 atm) assuming ideal gas behaviour is …………..
  • A
    1
  • B
    0.1
  • ✓
    0.01
  • D
    0.001
Answer
Correct option: C.
0.01
(C) 0.01
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MCQ 261 Mark
Assuming ideal gas behaviour, the ratio of density of ammonia to that of hydrogen chloride at same temperature and pressure is ………….. (Atomic wt. of Cl = 35.5 u)
  • A
    1.46
  • ✓
    0.46
  • C
    1.64
  • D
    0.64
Answer
Correct option: B.
0.46
(B) 0.46
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MCQ 271 Mark
As the temperature increases, average kinetic energy of molecules increases. What would be the effect of increase of temperature on pressure provided the volume is constant?
  • ✓
    Increases
  • B
    Decreases
  • C
    Remains same
  • D
    Becomes half
Answer
Correct option: A.
Increases
(A) Increases
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MCQ 281 Mark
At 300 K, the density of a certain gaseous molecule at 2 bar is double to that of dinitrogen at 4 bar. The molar mass of gaseous molecule is …………….
  • A
    $28 g mol ^{-1}$
  • B
    $56 g mol ^{-1}$
  • ✓
    $112 g mol ^{-1}$
  • D
    $224 g mol ^{-1}$
Answer
Correct option: C.
$112 g mol ^{-1}$
(C) $112 g mol ^{-1}$
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MCQ 291 Mark
The pressure of $2 \ mole$ of ideal gas at $546 K$ having volume $44.8 L$ is $…………….$
  • ✓
    $2 \ atm$
  • B
    $3 \ atm$
  • C
    $7 \ atm$
  • D
    $1 \ atm \ 10^{23}$
Answer
Correct option: A.
$2 \ atm$
$2 \ atm$
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MCQ 301 Mark
Which of the following expression at constant pressure represents Charles's law?
  • A
    $V \propto \frac{1}{ T }$
  • B
    $V \propto \frac{1}{ T ^2}$
  • ✓
    $V \propto T$
  • D
    $V \propto d$
Answer
Correct option: C.
$V \propto T$
(C) $V \propto T$
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MCQ 311 Mark
The composition of $………….$ in air is about $78\%$ by volume.
  • A
    $CO_2$
  • B
    $O_2$
  • ✓
    $N_2$
  • D
    $Ar$
Answer
Correct option: C.
$N_2$
$N_2$
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MCQ 321 Mark
Which of the following is CORRECT for both gases and liquids?
  • A
    Indefinite volume
  • B
    Definite shape
  • C
    Indefinite shape
  • ✓
    Definite volume
Answer
Correct option: D.
Definite volume
(D) Definite volume
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