Class 11th

Class 11th Structure of Atom

Contributor-Level 10

Using $λ = \frac{h}{\sqrt[]{2 q V m}}$

$λ_{L i} = \frac{h}{\sqrt[]{2 * 3 e * V * 8.3 m}}$ m = mass of proton

$λ_{p} = \frac{h}{\sqrt[]{2 * e * V * m}}$

$\frac{λ_{L i}}{λ_{p}} = \sqrt[]{\frac{2 e V m}{2 * 24.9 e V m}}$

= 0.2 = 2 * 10^-1

So; x = 2

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Which of the following graphs correctly represents the variation of particle momentum with associated de-Broglie wavelength ?

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Contributor-Level 10

λ = h/p there is inverse relation between de-Broglie wavelength and momentum, hence the graph will be rectangular hyperbola.

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Which among the following is a false statement ?

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Contributor-Level 10

(A) SiO? has three-dimensional network structure of Si – O bonds; while carbon dioxide consists of discrete CO? molecules. SiO? is solid, whereas CO? is a gas
(B) Because of its great affinity for oxygen, Si always occurs as the oxide, silica (SiO? ) or in the form of silicates, which are the compounds of SiO? with other metal oxides.
(C) SiO? + 2Mg → Si + 2MgO
(D) The reluctance of silicon to form pπ – pπ bonds to itself is clearly shown by the fact that silicon does not exist in graphite-like structure, but only in diamond like structure.

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Class 11th Equilibrium

At 1990K and 1 atm pressure, there are equal number of Cl₂ molecules and Cl atoms in the reaction mixture. The value of K_P for the reaction Cl_2(g) $?$ 2Cl_(g) under the above conditions is x * 10^-1. The value of x is______ (Rounded off to the nearest integer)

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Contributor-Level 10

$C l_{2 (g)} ? 2 C l_{(g)}$

Initially -> 1 mol -

At eq. 1-x mol 2x mol

Here; molecules of Cl₂ = atoms of Cl

i.e moles of Cl₂ = moles of Cl

So : 1 – x = 2x x = 1/3

Moles of Cl₂ at equ

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$C l_{2 (g)} ? 2 C l_{(g)}$

Initially -> 1 mol -

At eq. 1-x mol 2x mol

Here; molecules of Cl₂ = atoms of Cl

i.e moles of Cl₂ = moles of Cl

So : 1 – x = 2x x = 1/3

Moles of Cl₂ at equibrium = $\frac{2}{3}$

Moles of Cl at equilibrium = $\frac{2}{3}$

Total moles = $\frac{4}{3}$

Now: $P_{C l_{2}} = \frac{2}{4} * 1 a t m$

$= \frac{1}{2} a t m$

$P_{C l} = \frac{2}{4} * 1 a t m = \frac{1}{2} a t m$

$K_{P} = \frac{{(P_{C l})}^{2}}{P_{C l_{2}}} = \frac{{(\frac{1}{2})}^{2}}{\frac{1}{2}} = \frac{1}{2}$

$K_{P} = 0.5 = 5 * 1 0^{- 1}$

Here : x = 5

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For the reaction A_(g) -> B_(g) the value of the equilibrium constant at 300K and 1 atm is equal to 100.0 The value of $Δ_{r} G$ for the reaction at 300K and 1 atm in J mol^-¹ is -xR, where x is_________.

(Rounded off to the nearest integer)

[R = 8.31 J mol^-¹ K^-¹ and In 10 = 2.3]

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Contributor-Level 10

A (g) -> B (g) K_P = 100

$Δ G$ at 300 K and 1 atm

Using

$Δ G = - R T l n K_{P}$

$Δ G = - R * 300 l n 100$

=-R * 300 * 2 * 2.3

$Δ G = - 1380 R$

So; x = 1380.

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Number of amphoteric compounds among the following is___________.

(a) BeO (B) BaO (c) Be(OH)₂ (d) Sr(OH)₂

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Beo & Be (OH)₂ are amphoteric in nature, because they react with both acid and base

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2 months ago

The gas released during anaerobic degradation of vegetation may lead to:

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Class 11th Chemistry Chemical Bonding and Molecular Structure

Contributor-Level 10

Methane gas is produced during anaerobic degradation of vegetation that leads to global warming so considered as greenhouse gas like CO₂. Also it causes cancer.

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Which of the following are isostructural pairs?

A. $S O_{4}^{2 -} a n d C r O_{4}^{2 -}$

B. SiCl₄ and TiCl₄

C. NH₃ and $N O_{3}^{-}$

D. BCl₃ and BrCl₃

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Class 11th Thermodynamics

A carnot engine works between temperatures 327°C and 27°C. If the engine takes 1600 J of heat from the higher temperature reservoir, the work done by the engine per cycle (in Joule) is equal to ______.

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Contributor-Level 10

(Q? - Q? )/Q? = (T? - T? )/T? ; Q = (300/600) * 1600 = 800 J
work done = Q? - Q? = 1600 – 800 = 800J

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Class 11th Oscillations

The fundamental frequency of an organ pipe open at one end is 300 Hz. The frequency of 3rd overtone of n Find n.*this organ pipe is 100 Hz

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