Tags Chemistry NCERT Exemplar Solutions Class 12th Chapter Two

Chemistry NCERT Exemplar Solutions Class 12th Chapter Two

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5 months ago

Chemistry NCERT Exemplar Solutions Class 12th Chapter Two Chemical Kinetics

40% of HI undergoes decomposition to H₂ and I₂ at 300K. $Δ G^{Θ}$ for this decomposition reaction at one atmosphere pressure is_____________J mol^-1 (nearest integer)

(Use R = 8.31 JK^-1 mol^-1; log 2= 0.3010, In 10 = 2.3, log 3 = 0.477)

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Vishal Baghel

Contributor-Level 10

$H l ? \frac{1}{2} H_{2} + \frac{1}{2} l_{2}$

t = eq1 - $\frac{α}{2}$ $\frac{α}{2} [α = 0.4]$

$K p = \frac{{(P_{H_{2}})}^{\frac{1}{2}} * {(P_{l_{2}})}^{\frac{1}{2}}}{P_{H l}} = \frac{{(0.2)}^{\frac{1}{2}} * {(0.2)}^{\frac{1}{2}}}{0.6}$

= $- 8.31 * 300 * 2.3 * l o g (\frac{1}{3}) = 2735 J / m o l$

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Chemistry NCERT Exemplar Solutions Class 12th Chapter Two Solutions

The osmotic pressure exerted by a solution prepared by dissolving 2.0g of protein of molar mass 60 kg mol^-1 in 200 mL of water at 27°C is_______Pa. (nearest integer)

(Use R = 0.083 L bar mol^-1 K^-1)

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Vishal Baghel

Contributor-Level 10

$π = i * c * R * T = \frac{2 * 0.83 * 300}{60 * 1 0^{3}} = 0.00415 b a r$

= 415 Pa

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Chemistry NCERT Exemplar Solutions Class 12th Chapter Two Class 12th

A fish swimming in water body when taken out from the water body is covered with a film of water of weight 36g. When it is subjected to cooking at 100°C, then the internal energy for vaporization in kJ mol^-1 is_____________. (nearest integer)

[Assume steam to be an ideal gas. Given $Δ_{v a p} H^{Θ}$ for water at 373K and 1 bar is 41.1 kJ mol^-1; R = 8.31 JK^-1mol^-1]

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Vishal Baghel

Contributor-Level 10

Vapourisation of $H_{2} O, H_{2} O_{(l)} \to H_{2} O_{(g)}$

Mole of H₂O= $\frac{36}{18} = 2 m o l$

$Δ E = Δ H - Δ n R T$

$= 41.1 - \frac{1 * 8.31 * 373}{1000} = 38 k J / m o l e$

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Chemistry NCERT Exemplar Solutions Class 12th Chapter Two Thermodynamics

Amongst SF₄, XeF₄, CF₄ and H₂O, the number of species with two lone pairs of electrons is___________.

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Vishal Baghel

Contributor-Level 10

Water has only two lone pair and XeF₄ has two lone pair electron in opposite plane of the central atom.

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Chemistry NCERT Exemplar Solutions Class 12th Chapter Two States of Matter

In a solid AB, A atoms are in ccp arrangement and B atoms occupy all octahedral sites. If two atoms from the opposite face are removed, then the resultant stoichiometry of the compound is A_xB_y. The value of x is ___________(nearest integer)

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Vishal Baghel

Contributor-Level 10

After removal A = 4 $(\frac{1}{2} * 2) = 3$

After removal B = 4 – 1 = 4 (only two atoms are removed)

Final formula of the compound = A₃B₄

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Chemistry NCERT Exemplar Solutions Class 12th Chapter Two Some Basic Concepts of Chemistry

CNG is an important transportation fuel. When 100g CNG is mixed with 208g oxygen in vechicles, it leads to the formation of CO₂ and H₂O and produces large quantity of heat during this combustion, then the amount of carbon dioxide produced in germs is ______.

(nearest integer)

[Assume CNG to be methane]

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