States of Matter Test

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States of Matter Test - 9

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is not an assumption of the kinetic theory of gases?

A
Collision of gas particles are perfectly elastic.

B
Gas particles have negligible volume.

C
At high pressure, gas particles are difficult to compress.

D
A gas consists of many identical particles which are in continual motion.
Question 2
1 / -0

Liquid $$M$$ and liquid $$N$$ form an ideal solution. The vapour pressures of pure liquids $$M$$ and $$N$$ are $$450$$ and $$700\ mm$$ $$Hg$$, respectively, at the same temperature. Then correct statement is:
($${x}_{M}=$$ Mole fraction of $$M$$ in solution;
$${x}_{N}=$$ Mole fraction of $$N$$ in solution;
$${y}_{M}=$$ Mole fraction of $$M$$ in vapour phase;
$${y}_{N}=$$ Mole fraction of $$N$$ in vapour phase)

A
$$({x}_{M}-{y}_{M})< ({x}_{N}-{y}_{N})$$

B
$$\cfrac{{x}_{M}}{{x}_{N}}< \cfrac{{y}_{M}}{{y}_{N}}$$

C
$$\cfrac{{x}_{M}}{{x}_{N}}> \cfrac{{y}_{M}}{{y}_{N}}$$

D
$$\cfrac{{x}_{M}}{{x}_{N}}= \cfrac{{y}_{M}}{{y}_{N}}$$

Solution

Since $$ P^o_N>P^o_M,$$ so $$N$$ is more volatile than $$M.$$

$$\therefore y_N>x_N$$

and $$x_M>y_M$$

Multiply we get

$$y_N\times x_M>x_N \times y_M$$

$$i.e.\ \dfrac{x_M}{x_N}=\dfrac{y_M}{y_N}$$
Question 3
1 / -0

The correction factor $$'a'$$ to the ideal gas equation corresponds to:

A
electric field present between the gas molecules

B
density of the gas molecules

C
forces of attraction between the gas molecules

D
volume of the gas molecules

Solution

The correction factor $$'a'$$ to the ideal gas equation corresponds to forces of attraction between the gas molecules. Greater the value of $$'a'$$, more easily a gas can be liquefied. The unit of $$'a'$$ is $$ atm L^{2}mol^{-2}$$.
Question 4
1 / -0

Gay Lussac's law of gaseous volume is derived from :

A
law of definite proportions

B
law of multiple proportions

C
law of reciprocal proportions

D
experimental observation

Solution

Gay Lussac's law of gaseous volume is derived from experimental observation. According to this law, at constant volume, pressure of a given mass of a gas varies directly with the temperature.
Question 5
1 / -0

If saturated vapours are compressed slowly (temperature remains constant) to half the initial volume, their pressure will:

A
become four times

B
become double

C
remain unchanged

D
become half

Solution

When saturated vapour is compressed it's composition (liq-vapour)changes which make sure that pressure remains constant. Saturated Vapour doesn't obey ideal gas law.
Question 6
1 / -0

In a given mixture of non-reacting gases, the ratio of partial pressure of each gas is equal to its:

A
weight percent

B
volume percent

C
mole fraction

D
critical pressure

Solution

Dalton's law of partial pressures states that in a mixture of non-reacting gases, the total pressure exerted is equal to the sum of the partial pressures of the individual gases. The ratio of partial pressure of a gas to the total pressure is equal to the mole fraction of the gas.
Question 7
1 / -0

According to the Avogadro's Law, equal volumes of two different gases, under same conditions of temperature and pressure, contain equal number of:

A
atoms

B
molecules

C
electrons

D
protons

Solution

Avogadro's Law states that equal volumes of two different gases, under the same conditions of temperature and pressure, contain an equal number of molecules.
Question 8
1 / -0

What is the numerical value of gas constant R,in lit atm $$mol^{-1}$$ $$K^{-1}$$?

A
0.0821

B
8.314 x 10$$^{7}$$

C
8.314

D
1.987

Solution

The numerical value of gas constant R,in lit atm $$mol^{-1}$$ $$K^{-1}$$ is 0.0821.
Question 9
1 / -0

The total pressure of a mixture of two gases is:

A
the sum of the partial pressure

B
the difference between the partial pressure

C
the product of the partial pressure

D
the ratio of the partial pressure

Solution

According to Dalton's law of partial pressure, the total pressure of a mixture of two gases is the sum of the partial pressure.
Question 10
1 / -0

At same temperature and pressure, equal volumes of gases contain the same number of:

A
molecules

B
electrons

C
protons

D
particles

Solution

Avogadro's hypothesis: All gases containing equal moles if substance occupy the same volume at the same temperature and pressure.

Hence, equal volumes of gases will have an equal number of particles that can be atoms or molecules.

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States of Matter Test - 9

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States of Matter Test - 9

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Question 1

Collision of gas particles are perfectly elastic.

Gas particles have negligible volume.

At high pressure, gas particles are difficult to compress.

A gas consists of many identical particles which are in continual motion.

Question 2

$$({x}_{M}-{y}_{M})< ({x}_{N}-{y}_{N})$$

$$\cfrac{{x}_{M}}{{x}_{N}}< \cfrac{{y}_{M}}{{y}_{N}}$$

$$\cfrac{{x}_{M}}{{x}_{N}}> \cfrac{{y}_{M}}{{y}_{N}}$$

$$\cfrac{{x}_{M}}{{x}_{N}}= \cfrac{{y}_{M}}{{y}_{N}}$$

Solution

Question 3

electric field present between the gas molecules

density of the gas molecules

forces of attraction between the gas molecules

volume of the gas molecules

Solution

Question 4

law of definite proportions

law of multiple proportions

law of reciprocal proportions

experimental observation

Solution

Question 5

become four times

become double

remain unchanged

become half

Solution

Question 6

weight percent

volume percent

mole fraction

critical pressure

Solution

Question 7

atoms

molecules

electrons

protons

Solution

Question 8

0.0821

8.314 x 10$$^{7}$$

8.314

1.987

Solution

Question 9

the sum of the partial pressure

the difference between the partial pressure

the product of the partial pressure

the ratio of the partial pressure

Solution

Question 10

molecules

electrons

protons

particles

Solution

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