Volume of Gases and Number of Moles

Q.

Which of the following contains the maximum number of atoms and why?

1. 4g of ${\mathrm{H}}_2$

2. 16g of ${\mathrm{O}}_2$

3. 28g of ${\mathrm{N}}_2$

4. 18g of ${\mathrm{H}}_2\mathrm{O}$

Q.

The formula to find out the number of moles at STP is

Number of moles = $\frac{\text{Molar volume at STP (litres)}}{\text{Volume at STP (litres)}}$

1. True

2. False

Q.

Volume occupied by 1 mole of a gas at STP is 22.7L or 22.4L?

As internet is showing it 22.4L and our school is teaching it 22.7L.

Q. 29.2% (w/W) HCl stock solution has density of $1.25gm{L}^{-1}.$ The molecular weight of HCl is 36.5 g $mo{l}^{-1}.$The volume (mL) of stock ___

Q.

The number of moles present in 11.2 litres of ${\text{CO}}_2$ at S.T.P is:

1. 0.5 mol

2. 2.0 mol

3. 2.5 mol

4. 0.2 mol

Q.

Calculate the molecular mass of a gas if the vapour density of the gas is 22.

Q.

What is the volume of the gas?

Q. The number of molecules in 22.4 cubic cm of dinitrogen gas at STP is

Q.

When a gas-filled closed vessel is heated to $1°\mathrm{C}$, its pressure increases by $0.4\%$. What is the initial temperature of the gas?

Q. How to add water to concentrated nitric acid for making dilution?

Q. The value of temperature and pressure for STP is

1. 273 K and 1 atm
2. 27 K and 0 atm
3. 100 K and 100 atm
4. 373 K and 0 atm

Q.

What volume of oxygen at STP is required to affect the combustion of 11 litres of ethylene [C2H4] at 273∘C and 380 mm of Hg pressure?
C2H4+3O2→2CO2+2H2O

Q. Which of the following contains the maximum number of molecules?

1. 200 cc of at S.T.P
2. 150 cc of at S.T.P
   
3. 50 cc of at S.T
   
4. 150 cc of at S.T.P

Q.

Commercial $11.2$ volume of $H_2{O}_2$ solution has a molarity of______

Q.

According to Charles's law, the volume of a gas is directly proportional to the number of molecules at constant temperature and pressure.

1. True

2. False

Q.

Which of the following is/are characteristic of gasses?

1. Gasses have fixed volume but not fixed shape.

2. Gases are highly expansible.

3. They have high density.

4. They can be liquified.

Q.

What volume of oxygen at STP is required to affect the combustion of 11 litres of ethylene at 273 C and 380 mm of Hg pressure?

Q.

Avogadro number represents the number of atoms in___.

1. 1 gram of carbon-12

2. 12 grams of carbon-12

3. 32 grams of oxygen

4. 320 grams of oxygen

Q. For strong acid base neutralisation energy for 1 mole H2O formation is -57.1 kJ.If 0.25 mole of a strong monoprotic acid is reacted with 0.5 mole of strong base then enthalpy of neutralisation is

Q.

The number of moles present in 224 L of nitrogen at STP is

1. 10

2. 0.1

3. 0.01

4. 0.001

Q.

Calculate the volume of oxygen required for the complete combustion of 8.8 g of propane (C₃H₈).

[Atomic mass: C = 12, O = 16, H = 1, Molar volume = 22.4 dm³ at stp]

5.20 litres

3.50 litres

2.58 litres

4.48 litres

1.99 litres

Q.

The molecular mass of carbon dioxide is 44 g. The volume of 132 g of carbon dioxide at STP is

1. 22.4 L

2. 67.2 L

3. 105.6 L

4. 7.47 L

Q.

What is alkali salt?

Q.

Which of the following have ${\mathrm{sp}}^3{\mathrm{d}}^2$ hybridization?

1. ${\mathrm{IF}}_7$

2. ${{\mathrm{ICl}}_2}^{-}$

3. ${{\mathrm{ICl}}_4}^{-}$

4. ${{\mathrm{BrF}}_2}^{-}$

Q.

Find the number of moles in $7\mathrm{g}$ of $\mathrm{Na}$

1. $1\mathrm{mole}$

2. $0.304\mathrm{mole}$

3. $0.5\mathrm{mole}$

4. $0.25\mathrm{mole}$

Q.

$N_2$ is found in a litre flask under 100kPa pressure and $O_2$ is found in another 3 litre flask under 320 kPa pressure. If the two flasks are connected, the resultant pressures is

1. 420 kPa

2. 365 kPa

3. 265 kPa

4. 210 kPa

5. 310 kPa

Q.

What is the amount of sulphuric acid require to neutralise completely 8g of caustic soda? Sir, can you provide me more such questions with answers.

Q. 2500cc of oxygen was burnt with 600cc of ethane . Calculate the volume of unused oxygen and the volume of carbon dioxide formed, after writing a balanced equation.

Q.

A gas has a pressure of 1.26 atm and occupies a volume of 7.40 L. If the gas is compressed to a volume of 2.93 L, what will its pressure?

1. 2.58 atm

2. 3.18 atm

3. 3.99 atm

4. 4.24 atm

Q.

Only a very dilute solution of hydrogen chloride in water can be concentrated by boiling the solution while a very concentrated solution would become less concentrated when boiled explain why?