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According to ideal gas equation :

pV = nRT or p = \(\frac{nRT}{V}\) 

n = \(\frac{Mass\ of\ gas(m)}{Molar\ mass\ of\ gas(M)}\) 

p = \(\frac{mRT}{MV}\) 

Now density, d = \(\frac{m}{V}\) 

∴ p = \(\frac{dRT}{M}\) 

Or d ∝ p at constant temperature.

1. Kinetic molecular theory of gases.

2. 

• The volume of a gas molecule is negligible when compared to the whole volume of the gas. 
• There is no force of attraction between the particles of a gas at ordinary temperature and pressure. 
• The gas molecules are in random motion. 
• During motion, they collide with each other and also with the walls of the container. 
• Gravity has no influence in the movement of gas molecules. 
• Pressure of a gas is due to the collision of gas molecules with the walls of the container. 
• At any particular time, different particles in the gas have different speeds and hence different kinetic energies.

1. No. NH₃ reacts with HCl to form NH₄CI. Since they are not non-interacting gases, their sum of partial pressures may not be equal to the total pressure.

2. Dalton’s law of partial pressures.

3. It states that the total pressure exerted by the mixture of non-reactive gases is equal to the sum of the partial pressures of individual gases.

1. Dalton’s law of partial pressures. 

2. In the absence of attractive forces, the particles of the gas behave independent of one another. The same is true even if there are more than one type of molecules. Thus, the number of molecules colloding the unit area of the wall per second at a given temperature, fora fixed amount of the gas issame.lt implies that the partial pressure of the gas will be unaffected by the presence of the molecules of other gases. But, the total pressure exerted is duet the impact of molecules of all the gases. Hence, the total pressure would be the sum of the partial pressures of the gases.

1. The statement is wrong. 

2. This is because real gases behave ideally at high temperature and low pressure, when the gas molecules are far apart.

3. \(\Big(p+\frac{a}{V^2}\Big)\) (v-b) = RT

Let the oxidation no. of Fe = x

1 x  3 + X x 1 (–1) x 6 = 0

x = +3

EAN = No. of electron in Fe³⁺ + No. of electron in 6 CN^- ion

= (26 – 3) + 12 = 35 

:. EAN = 35

EAN of Fe in K₃[Fe(CN)₆]

= 26 - 2 + 2 x 6 = 36 [Ar]

At room temp, H₂O form intermoleculer H-bond while H₂S dues not; Because Electronegativity of 0-atom is greater while size is smaller then s-atom Hence H₂O is liquid while H₂S 10 gas.

Iodoform test:

On heating ethyl alcohol, with I, & NaOH gives yellow PPt of iodoform which has foul smell.

C₂H₅OH + 3I₂ + 4NaOH → HCl₃↓ + HCOONa Yellow PPt (Iodoform) + 3HI + 3H₂O

While Methyl alcohol does not give this test

The size of central atom H₂S is larger than that in H₂O₂S — H bond is larger and weaker than O-H bond H₂O, hence H₂S is more acidic than H₂O.

Gd – Electronic Configuration : [Xe] 4f⁷5d¹ 6s² 

Gd³⁺ Electronic Configuration : [Xe] 4f⁷ 

In Gd³⁺ , no electrons are there in outer d-orbitals. d-d transition is not possible. So it is colourless.

The uses of the potash alum:

• It is used for purification of water. 
• It is also used for water proofing and textiles. 
• It is used in dyeing, paper and leather tanning industries. 
• It is employed as a styptic agent to arrest bleeding.

Answer is (b) (C₂H₅)₃N > (C₂H₅)₂NH > C₂H₅NH₂ > NH₃

The alunite the alum stone is the naturally occurring form and it is K₂SO₄ . Al₂(SO₄) .4Al(OH)₃ . When alum stone is treated with excess of sulphuric acid, the aluminium hydroxide is converted to aluminium sulphate.

A calculated quality of – potassium sulphate is added and the solution is crystallised to generate potash alum. It is purified by recrystallisation.

K₂SO₄.Al₂(SO₄)₃ .4Al(OH)₃ + 6H₂SO₄ ⟶ K₂SO₄ + Al₂(SO₄)₃ + 12H₂O

K₂SO₄ + Al₂(SO₄)₃ +24H₂O  ⟶K₂SO₄.Al₂(SO₄)₃.24H₂O

Eye lense are manufactured by PMMA

Answer is (a) CH₃CHO

CH₃ – CHO compound does not perform Cannizaro’s reaction among .

The compounds formed are NaCl & NaOCl 

NaNO₃ compound does not give colourless gas.

The molecular formula of formed deep blue colouration is [Cu(NH₃)₄] SO₄

(b) enthalpy 

Correct answer is (C) the number of particles of solute

Correct answer is (B) π/C = RT

Correct answer is (C) 2 Faraday

Correct answer is (b) 81 : 1

Correct answer is (i)(a) (ii) b

The angle of incidene corresponding to which angle of refraction becomes 90º is called critical angle.

Conditions:

(i) Light should travell from denser medium to rarer medium

(ii) For total internal reflection angle of incidence must be greater than critical angle.

The process of adding desirable impurities in the intrinsic semiconductor is called doping.

The core of a transformer is laminated to insulate the core due to which the current induced in the iron core due to alternating magnetic flux can be minimised.

Polaroid is a device used to produce the plane polarised light.

Use of polaroid

(i) It is used as glass windows in train and aeroplanes.

(ii) lt is used in sun glasses (goggles) to block the glare.

(iii) It is used to record and reproduce three dimenional moving pictures.

(iv) It is used to elimirate the daggle from the head lights of cars, buses etc.

Concept :

Net Production Time = Cycle Time \(\times\) Number of Units Produced

Calculation:

Given:

Net Production Time = \(2\times8 \times3600\) = 57600 sec

Number of Units Produced = 30000

\(Cycle\; time = \frac{Net \;Production\; time}{Number\;of\;Units\;Produced}\)

\(Cycle\; time = \frac{57600}{30000} =1.9\)

∴ Cycle time = 1.9 sec