Gay Lussac's Law

Q.

What is meant by the isentropic process?

Q.

The number of molecule at NTP in 1 ml of an ideal gas will be

1. $2.69\times {10}^{23}$
2. $6\times {10}^{23}$
3. $2.69\times {10}^{19}$
4. None of these

Q.

The vapour density of a gas is 11.2. The volume occupied by 11.2 g of the gas at ATP will be

1. 22.4 L
2. 1 L
3. 44.8 L
4. 11.2 L

Q.

Arrange the following solutions in the decreasing order of their $\mathrm{pOH}$:

$$\begin{gathered} \left(\mathrm{A}\right)0.01\mathrm{M}\mathrm{HCl} \\ \left(\mathrm{B}\right)0.01\mathrm{M}\mathrm{NaOH} \\ \left(\mathrm{C}\right)0.01\mathrm{M}{\mathrm{CH}}_3\mathrm{COONa} \\ \left(\mathrm{D}\right)0.01\mathrm{M}\mathrm{NaCl} \end{gathered}$$

1. $\left(\mathrm{A}\right)>\left(\mathrm{C}\right)>\left(\mathrm{D}\right)>\left(\mathrm{B}\right)$

2. $\left(\mathrm{B}\right)>\left(\mathrm{D}\right)>\left(\mathrm{C}\right)>\left(\mathrm{A}\right)$

3. $\left(\mathrm{B}\right)>\left(\mathrm{C}\right)>\left(\mathrm{D}\right)>\left(\mathrm{A}\right)$

4. $\left(\mathrm{A}\right)>\left(\mathrm{D}\right)>\left(\mathrm{C}\right)>\left(\mathrm{B}\right)$

Q.

Pressure of 1 g of an ideal gas A at 27 °C is found to be 2 bar. When 2 g of another ideal gas B is introduced in the same flask at the same temperature the pressure becomes 3 bar. Find a relationship between their molecular masses.

1. $2M_A=M_B$

2. $M_A=4M_B$

3. $4M_A=M_B$

4. $M_A=2M_B$

Q. The net charge of an atom is equal to zero. What does this indicate about the atom?

1. Atoms have zero mass
2. Atoms have equal number of electrons and protons
3. Atoms are neutral
4. Both A & B

Q.

If the value of Avogadro number is 6.023 $\times {10}^{23}mo{l}^{-1}$ and the value of Boltzmann constant is 1.380 $\times {10}^{-23}J{K}^{-1},$ then the number of significant digits in the calculated value of the universal gas constant is ___

Q.

The volume of 1 mole of oxygen gas is 22400 mL at 760 mm. Calculate the temperature of the gas(Given $R=0.082L-atmmo{l}^{-1}K-1$)

1. ${273}^{\circ }C$

2. ${1.17}^{\circ }C$

3. ${273.17}^{\circ }C$

4. ${0.17}^{\circ }C$

Q.

Explain the formation of ozone. [2 MARKS]

Q.

What is the least count of a burette?

Q.

A bottle of liquor ammonia should be opened very carefully, only after cooling it in ice because:

1. There is a high pressure inside the bottle.

2. On cooling, the pressure inside the bottle increases.

3. It’s not necessary to open the bottle of liquor ammonia carefully.

4. There is a low pressure inside the bottle.

Q. A block of mass m kg is kept on a weighing machine in an elevator.If the elevator is retarding upward by a m/s2, the reading of weighing machine is(in kgf)

Q.

On a ship sailing in the Pacific ocean, where the temperature is 23.4${}^{\circ }$C, a balloon is filled with 2 L air. What will be the volume of the balloon when the ship reaches the Indian ocean where the temperature is 26.1${}^{\circ }$ C?

1. 2.0184 L

2. 1.96 L

3. 1.88L

4. 2.42 L

Q.

4.215 g of a metallic carbonate was heated in a hard glass tube and the CO₂ evolved was found to measure 1336 ml at 27 and 700 mm pressure. What is the equivalent weight of the metal?

Q.

Find the atomicity of ozone if its atomic mass is 16 and its molecular mass is 48.

1. 3

2. 2

3. 1

4. 4

Q.

At which temperature will the volume of all gases reduce to zero will be

1. High temperature

2. Low temperature

3. All temperature

4. Absolute temperature

Q.

A helium-filled balloon has a volume of 2.75 L at ${20}^{\circ }$C. The volume of the balloon decreases to 2.46 L after it is placed outside on a cold day. What is the outside temperature in ${}^{\circ }$ C?

1. ${12.9}^{\circ }C$

2. ${10.9}^{\circ }C$

3. ${20.9}^{\circ }C$

4. ${8.9}^{\circ }C$

Q.

The volume of 1 mole of an ideal gas at ${25}^{\circ }C$ temperature and 1 bar pressure is:

1. 24.4 L

2. 22.4 L

3. 22.7 L

4. 24.8 L

Q.

What is gram molar volume?

Q.

A gas at ${65}^{\circ }C$ occupies 4.22 L. At what Celsius temperature will the volume be 3.87 L?

1. ${36.96}^{\circ }C$

2. ${319.96}^{\circ }C$

3. ${39.96}^{\circ }C$

4. ${309.96}^{\circ }C$

Q.

How do you calculate absolute permeability from the darcy equation?

Q.

$600c{m}^3$ of a gas at a pressure of 750 mm is compressed to $500c{m}^3$. Taking the temperature to remain unchanged, find the increase in pressure.

1. 180 mm

2. 900 mm

3. 945 mm

4. 150 mm

Q.

Calculate the pressure exerted by 5 mol of $C{O}_2$ in 1 L vessel at ${47}^{\circ }C$ using van der Waals equation. Also, calculate the pressure for an ideal gas. Given $a=3.592atm{L}^{2}mo{l}^{-2}$, b = 0.0427 L $mo{l}^{-1}$ .

1. 131.2 , 77.01

2. 69.83, 126.22

3. 77.01, 131.2

4. 114 , 122

Q.

Name a substance whose solubility increases slightly with temperature

Q. At what temperature, the volume of 'V' of a certain mass of a gas at ${37}^{o}C$ will be doubled, keeping the pressure constant?

1. 327⁰C

2. 347⁰C

3. 527⁰C

4. 54⁰C

Q.

Calculate the gram molecular mass of $N_2$, if $360c{m}^3$ at STP weighs 0.45 g.

1. 56 g

2. 21 g

3. 28 g

4. 14 g

Q. (i) With the help of equations, give an outline for the manufacture of sulphuric acid by the contact process.
(ii) What property of sulphuric acid is shown by the reaction of concentrated sulphuric acid when heated with
(A) potassium nitrate (B) carbon? [5 MARKS]

Q. Sulphuric acid can be used In the laboratory to prepare the following substances :
(a) Hydrogen (b) Carbon dioxide
(c) Carbon monoxide (d) Sulphur dioxide
(e) Hydrogen chloride (f) Hydrogen sulphide
(g) Nitric acid.
1. Derive a balanced equation for each of the shove preparation.
2. In which of the reactions would you use (give numbers only): (i) Dilute Sulphuric acid, (ii) Sulphuric acid.
3. State the chemical property of sulphuric acid illustrated in each of these reactions.

Q.

Calculate the weight of a substance X which in gaseous form occupies 10 litres at ${27}^{0}C$ and 700 mm pressure.The molecular weight of X is 60.

1. 60 g

2. 22.45 g

3. 20.45 g

4. 3.128 g

Q.

What is the vapour density of ethylene?