Gay Lussac's Law, Avagadro's Law

Q.

Calculate the molar mass of sulphur molecule.

Q.

The vapor density of a gas is 16, find its molecular weight.

Q.

One litre of $O_2$ at NTP reacts with 3 times the volume of CO at NTP. Calculate volume of $C{O}_2$ formed.

1. 2 L

2. 1 L

3. 3 L

4. 4 L

Q.

At constant temperature, in a given mass of an ideal gas

1. The ratio of pressure and volume always remains constant

2. Volume always remains constant

3. The product of pressure and volume always remains constant

4. Pressure always remains constant

Q.

In a 10 litre vessel, the total pressure of a gaseous mixture containing $H_2,N_{2}andC{O}_2$ is 9.8 atm, The partial pressures of $H_{2}and{N}_2$ are 3.7 and 4.2 atm respectively. Find the partial pressure of $C{O}_2$ .

1. 1.9 atm

2. 0.19 atm

3. 2.4 atm

4. 0.019 atm

Q.

Calculate the vapour density of ${\mathrm{SO}}_2$$(\mathrm{O}=16,\mathrm{S}=32)$.

Q. 2. In the reaction, N2 + 3 H2 gives 2 NH2, the ratio of volumes of nitrogen, hydrogen and ammonia is 1: 3: 2. These ratio illustrates which law?

Q.

Calculate the mass of the following:

$1.5\mathrm{mole}$of ${\mathrm{Na}}^{+}$ ion

Q.

According to Avogadro's law at the same temperature and pressure:

1. Matter consists of indivisible atoms.

2. Compounds are formed when atoms of different elements combine in a fixed ratio.

3. Matter can neither be created nor destroyed.

4. Equal volumes of gases contain equal number of molecules.

Q.

The vapour density of carbon dioxide $\left[\mathrm{C}=12,\mathrm{O}=16\right]$.

1. $12$

2. $16$

3. $44$

4. $22$

Q. Which of the following represents Avogadro’s hypothesis?

1. Atoms of different elements may combine with each other in a fixed, simple, whole number ratio to form compounds.
2. Equal volumes of all gases under the same temperature and pressure conditions contain an equal number of atoms.
3. Equal volumes of all gases under the same conditions of temperature and pressure contain an equal number of molecules.
4. Gases react together in volumes which bear a simple ratio to one another.

Q.

The vapour density of Hydrogen peroxide is equal to molecular weight of NH₃.

1. True
2. False

Q. If the pressure of the gas contained in a closed vessel is increased by $20\%$ when heated by $273K$ then, its initial temperature must have been:

1. ${1052}^{\circ }\text{C}$
2. $1029\text{K}$
3. ${1365}^{\circ }\text{C}$
4. $1365\text{K}$

Q. A pure sample of $N_2{O}_5$ gas contains 0.01 moles. Find the volume occupied by the gas sample at standard temperature and pressure conditions (STP).

1. $1\text{L}$
2. $0.224\text{L}$
3. $2.24\text{L}$
4. $11.2\text{L}$

Q. find mole of hydrogen gas required for the production of 10 mole of Ammonia by Habers process?

Q. $\text{Statement I:}$ Gas cannot be liquefied above its critical temperature by increasing its pressure.
$\text{Statement II:}$ Critical temperature depends on inter particle attraction.
In the light of above statements choose the correct option among the following.

1. Both statements I and statement II are correct
2. Statement I is correct but statement II is incorrect
3. Statement I is incorrect but statement II is correct
4. Both statements I and Statement II are incorrect

Q.

The density of a gas at S.T.P. is $1.40grams$ per litre. The molecular weight of the gas is

1. 28

2. 30

3. 31.4

4. 35

Q. The density of a mixture of nitrogen gas and oxygen gasses is 1.15g/L at 750mm of Hg at 27 degree centigrade. Calculate the percentage of the of gas in the gas mixture.

Q.

At 298K 1 atm, 1 volume of N₂ reacts with 3 volumes of H₂ to give 2 volumes of NH₃. The ratio 1:3:2 illustrates:

1. Constant proportions

2. Gay-Lussac’s law

3. Multiple proportions

4. Reciprocal proportions

Q.

The vapour density of ${\mathrm{CO}}_2$ gas is 22 . Find its molecular mass

Q. $11.2\text{L}$ of $C{H}_4$ and $22.4\text{L}$ of $C_2{H}_6$ at $STP$ are mixed. Then the correct statement(s) is/are:

1. Vapour density of the mixture is 12.67
2. Average molecular weight will be less than 16
3. Average molecular weight will be greater than 16 and less than 30
4. Average molecular weight will be greater than 30

Q. $10d{m}^3$ of $N_2$ gas and $10d{m}^3$ of gas X at the same temperature contain the same number of molecules.
The gas X is

1. $CO$
2. $C{O}_2$
3. $H_2$
4. $NO$

Q.

The volume of $1.5gm$ atoms of helium gas under standard conditions of temperature and pressure is

1. 22.4 lit

2. 33.6 lit

3. 44.8 lit

4. 11.2 lit

Q.

hydrogen reacts with nitrogen to produce ammonia .determine how much amonia would be produced if 200 g of hydrogenreacts with excess of nitrogen

Q.

A gas cylinder can hold 1 kg of hydrogen at room temperature and pressure.

If the number of molecules of hydrogen in the cylinder is X, calculate the number of carbon dioxide molecules in the cylinder. Give a reason for your answer.

Q. If the pressure of a gas contained in a closed vessel is increased by 0.4% when heated by $1\text{K}$, its initial temperature must be:

1. $250\text{K}$
2. $250{}^{\circ }\text{C}$
   
3. $25{}^{\circ }\text{C}$
   
4. $25\text{K}$

Q. Calculate the volume of hydrogen gas evolved when 2g of ammonia gas is heated at STP.

Q.

6.488g of lead combine directly with 1.002g of oxygen to form lead peroxide .lead peroxide is also produced by heating lead nitrate and it was found that the percentage of oxygen present in lead peroxide is 13.38%.Use this data to illustrate law of constant composition

Q. Illustrate the law of definite proportion from the following data
1) 0.16 gram of sulphur produces 112 ml of SO2 at ntp
2)sulphur dioxide obtained by the decomposition of sulphate contains 50% of sulphur

Q.

What is smog? How isclassical smog different from photochemical smog?