Class 12th

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An Ellingham diagram provides information about:

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Contributor-Level 10

Ellingham diagram provides information on Gibb's free energy for formation of oxides as a function of temperature.

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a year ago

How is the concept of temperature dependence used to generate high production by the industries?

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Aadit Singh Uppal

Contributor-Level 10

Industries manily select an optimal temperature which is high enough to increase the reaction rate (molecules colliding with each other at higher fequencies) and at the same time is balanced to avoid any side effect. This effectively yields high quality production without any wastage or leading to harmful results while ensuring safety of the consumers too.

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a year ago

The correct electronic configuration and spin - only magnetic moment (BM) of Gd³⁺ (Z = 64), respectively, are:

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Class 12th Chemistry Coordination Compounds

Contributor-Level 10

Gd: [Xe]4f?5d¹6s²
∴ Gd³? is [Xe]4f?
Also μ = √n (n + 2) B.M
= √7x9 B.M = 7.9 B.M

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The values of the crystal field stabilization energies for a high spin d? metal ion in octahedral and tetrahedral fields, respectively, are:

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Contributor-Level 10

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Which of the following derivates of alcohol is unstable is an aqueous base?

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Contributor-Level 10

Esters are susceptible to reaction in basic medium.

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Class 12th Physics

Four identical rectangular plates with length, l = 2cm and breadth, b = 3/2 cm are arranged as shown in figure. The equivalent capacitance between A and C is xε₀A/d. The value of x is ----------. (Round off to the nearest integer)

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Contributor-Level 10

Kindly consider the following figure

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Class 12th Physics

The equivalent resistance of series combination of two resistors is 's'. When they are connected in parallel, the equivalent resistance is 'p'. If s = np, then the minimum value for n is . (Round off to the Nearest Integer)

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Class 12th Electromagnetic Waves

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For series combination: s = R? + R?

For parallel combination: p = (R? ) / (R? + R? )

Given the condition s = np:
R? + R? = n * (R? ) / (R? + R? )
(R? + R? )² = nR? R?
R? ² + 2R? R? + R? ² = nR? R?
R? ² - 2R? R? + R? ² + 4R? R? = nR? R?
(R? - R? )² = (n - 4)R?
(R? - R? )² / (R? ) = n - 4
n = 4 + (R? - R? )² / (R? )

Since (R? - R? )² is always non-negative, the minimum value of the term (R? - R? )² / (R? ) is 0. This occurs when R? = R?
Therefore, the minimum value of n is 4.

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a year ago

If 2.5*10^-9 N average force is exerted by a light wave on a non- reflecting surface of 30 cm² area during 40 minutes of time span, the energy flux of light just before it falls on the surface is . W / cm². (Round off to the Nearest Integer) (Assume complete absorption and normal incidence conditions are there)

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Class 12th Communication Systems

Contributor-Level 10

The force (F) exerted by radiation is the rate of change of momentum (p).
F = Δp/Δt
For photons, p = E/c. So, F = (1/c) * (ΔE/Δt).
Since Power (P) is ΔE/Δt, F = P/c.
Intensity (I) is Power per unit Area (P/A).
The formula provided in the document is F/A = (nE)/ (Δt c A) which leads to a final calculated value of 25 W/cm².

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a year ago

For VHF signal broadcasting. km² of maximum service area will be covered by an antenna tower of height 30m, if the receiving antenna is placed at ground. Let radius of the earth be 6400km. (Round off to the Nearest Integer) (Take π as 3.14)

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