Ideal Gas Equation

Q.

Calculate the Molecular Mass of $\mathrm{Sucrose}(\mathrm{Table}\mathrm{Sugar}){\mathrm{C}}_{12}{\mathrm{H}}_{22}{\mathrm{O}}_{11}$.

Q.

If volume of a gas at 0 degree C is V then the volume of the gas at 27.3 degree C is nearly

Q.

The number of gram molecules of oxygen in $6.02\times {10}^{24}$ CO molecule is

1. 0.5 g-molecule

2. 2 g-molecule

3. 10 g-molecule

4. 5 g-molecule

Q. A compound $H_{2}X$ with molar weight of 80 g is dissolved in a solvent having density of 0.4 g $m{L}^{-1}.$ Assuming no change in volume upon dissolution, the molality of a 3.2 molar solution is ___

Q.

A mixture of oxygen and ethyne is burnt for welding but not a mixture of ethyne and air. Explain with reason.

Q.

A sealed tube which can withstand a pressure of 3 atmosphere of 3 atmosphere is filled with air at ${27}^0$C and 760 mm pressure. Find the temperature above which it will burst.

1. 627⁰C

2. 527⁰C

3. 727⁰C

4. 900⁰C

Q.

Question 14
Match the physical quantities given in column A to their SI units given in column B:
$\begin{array}{cc}\text{(A)}& \text{(B)}\\ \text{(a)Pressure}& \text{(i)cubic metre}\\ \text{(b)Temperature}& \text{(ii)Kilogram}\\ \text{(c)Density}& \text{(iii)pascal}\\ \text{(d)Mass}& \text{(iv)Kelvin}\\ \text{(e)Volume}& \text{(v)Kilogram per cubic metre}\end{array}$

Q. $6$ g of ethanoic acid and $2.3$ g of ethanol is mixed in the presence of conc. sulphuric acid. The number of moles of ethanoic acid and methanol used and the ester produced are respectively:

1. $1,5,$ ethyl methanoate
2. $0.1,0.05,$ methyl ethanoate
3. $0.1,0.05,$ ethyl ethanoate
4. $1,5,$ methyl methanoate

Q.

50 ml of 1M oxalic acid is shaken with 0.5 g of wood charcoal. The final concentration of the solution after adsorption is 0.5 M. Calculate the amount of oxalic acid adsorbed per gram charcoal.

1. 0.05 g

2. 3.15 g

3. 6.3 g

4. None

Q.

Calculate the percentage of phosphorus in the fertilizer, superphosphate $Ca(H_{2}P{O}_4{)}_2$.(Correct to 1 decimal point). [H = 1, O = 16, P = 31, C = 40]

1. 32.5 %

2. 21.0 %

3. 35.0 %

4. 26.5 %

5. 31.5 %

Q. A liquid boils when vapour pressure becomes equal to atmospheric pressure.

1. True
2. False

Q.

What is the chemical formula of ozone?

Q.

When 2 g of a gas is introduced into an evacuated flask kept at ${25}^{\circ }C$, the pressure is found to be 1 atmosphere. If 3 g of another gas B is then added to the same flask, the total pressure becomes 0.5 atmosphere. Assuming ideal gas behaviour, calculate the ratio of molecular mass $M_A:M_B$.

1. 3:1

2. 1:3

3. 3:2

4. 2:3

Q.

An open flask contains air at 27^∘ C. To what temperature it must be heated to expel one-fourth of the volume?

1. 
2. 
3. 
4. 

Q.

Define Henry’s law.

Q.

The correct value of the gas constant $\mathrm{R}$ is close to

1. $0.082\mathrm{L}-\mathrm{atmK}$

2. $0.082\mathrm{L}-{\mathrm{atmK}}^{-1}{\mathrm{mol}}^{-1}$

3. $0.082\mathrm{L}-{\mathrm{atm}}^{-1}\mathrm{K}{\mathrm{mol}}^{-1}$

Q.

Consider the following reaction:

The product ‘P’ gives a positive ceric ammonium nitrate test. This is because of the presence of which of these –$\mathrm{OH}$ group(s) ?

1. (b) only

2. (b) and (d)

3. (c) and (d)

4. (d) only

Q. Which of the following gas laws explains the application of hot air balloons in sports and meteorological observations?

1. Charles' law
2. Avogadro's law
3. Boyle's law
4. Gay Lussac's law

Q. For one mole of a Van der Waals' gas when b = 0 and T = 300 K, the pV vs 1/V plot is shown below. The value of the van der Waals' constant a (atm L $mo{l}^{-2}$)

1. 1
2. 4.5
3. 1.5
4. 3

Q.

What is meant by 1 mole of carbon atoms ?

Q.

The standard temperature and pressure values are:

1. 263 K and 760 mm of Hg

2. 273 K and 760 mm of Hg

3. 273 K and 730 mm of Hg

4. 273 K and 780 mm of Hg

Q. A cylinder can withstand a pressure of 15 atm. The pressure gauge of the cylinder indicates 12 atm at 27∘C. Above the cylinder will explode.

1. ${88}^{\circ }C$
2. ${110}^{\circ }C$
3. ${102}^{\circ }C$
4. ${115}^{\circ }C$

Q.

Vapour density of methane is___________-

Q.

The temperature at which water boil depend on the pressure the water is under . At sea level the pressure is 100kPa, water boil at hundred degree Celsius the pressure in the pressure cooker is greater than 100kPa and boiling point of water is greater than hundred degree Celsius .

on the mountain top at the altitude of 7700 m the climber found that his fuel store couldn't raise the temperature of boiling water above 75 degrees celsius best explanation explanation of this

first the stop didn't have the sufficient oxygen 21 the few completely .

second the also called it absorb the heat from the water .

third the pressure was less than it was at sea level .

Fourth the air fresher was better than it was at sea level

Q.

What happens when ferrous sulphide reacts with dil. hydrochloric acid?

1. Ferrous chloride and water is formed.

2. Ferrous chloride, water and CO₂ is formed.

3. Ferrous chloride, water and SO₂ is formed.

4. Ferrous chloride and H₂S is formed.

Q.

Calculate the percentage of sodium in sodium aluminium fluoride (Na₃AlF) correct to the nearest whole number.

(F= 19; Na= 23; Al=27)

Q. Which among the following has the highest normality?

1. 0.5 M sulphuric acid
2. 1 N phosphoric acid
   
3. 2 moles of NaOH per 1000 ml of solution
4. 8 g of KOH per 100 ml of solution

Q.

Hospitals buy 400-L cylinders of oxygen gas compressed at 150 atm. They administer oxygen to patients at 3.0 atm in a hyperbaric oxygen chamber. What volume of oxygen can a cylinder supply at this pressure?

1. 200000 L

2. 2000 L

3. 20000 L

4. 200 L

Q. The limiting molar conductivities ${\lambda }^{\circ }$ for $NaCl,KBr$ and $KCl$ are $126,152$ and $150Sc{m}^{2}mo{l}^{-1}$respectively. The ${\lambda }^{\circ }$ for $NaBr$ is

1. 278 S cm²mol^-1
2. 176 S cm²mol^-1
3. 302 S cm²mol^-1
4. 128 S cm²mol^-1

Q.

In a mixture of gases , the volume content of the gas is0 .06% at STP. Calculate the no. of molecules of the gas in 1litre of the mixture.