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8 months ago

Chemistry Class 11th

'x' g of molecular oxygen(O₂) is mixed with 200g of neon (Ne). The total pressure of the non-reactive mixture of O₂ and Ne in the cylinder is 25 bar. The partial pressure of Ne is 20 bar at the same temperature and volume. The value of 'x' is_________.

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alok kumar singh

Contributor-Level 10

Po₂ = P_Total - $P_{N_{2}}$ $5 = (\frac{x / 32}{x / 32 + \frac{200}{20}}) * 25 \Rightarrow x = 80 g m$

= 25 – 20 = 5bar

Po₂ = $\frac{n_{O_{2}}}{n_{O_{2}} + n_{N e}} * P_{T o t a l}$

$5 = (\frac{x / 32}{x / 32 + \frac{200}{20}}) * 25 \Rightarrow x = 80 g m$

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8 months ago

Chemistry Class 12th

In the below reaction, 5g of toluene is converted into benzaldehyde with 92% yield. The amount of benzaldehyde produced is____________* 10^-² g. (Nearest integer)

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Vishal Baghel

Contributor-Level 10

No. of moles = $\frac{5}{92} (t o l u e n e)$

Moles of benzaldehyde = $\frac{5}{92} * \frac{92}{100} = 5 * 1 0^{- 2}$

Mass of benzaldehyde = 5 * 10^-2 *106 = 5.3 gm

= 530 * 10^-2 gm

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8 months ago

Chemistry Class 12th

The spin only magnetic moment of the complex present in Fehling's reagent is __________B.M.

(Nearest Integer)

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Vishal Baghel

Contributor-Level 10

Fehling's solution is a complex of $C u^{2 +}, C u^{2 +} = 3 d^{9}$

No. of unpaired e^- = 1

MM = $\sqrt[]{1 (1 + 2)} = \sqrt[]{3} = 1.73 B M$

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8 months ago

Chemistry Chemical Bonding and Molecular Structure

The number of molecule(s) or ion(s) from the following having non-polar structure is _________.

$N O_{3}^{-}, H_{2} O, B F_{3}, P C l_{3}, X e F_{4}, S F_{4}, X e O_{3}, P H_{4}^{+}, S O_{3}, {[A l {(O H)}_{4}]}^{-}$

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Vishal Baghel

Contributor-Level 10

SO₃ -> Sp² Planar

BF₃ -> Sp² Planar

$N O_{3}^{-}$ -> Sp² Planar

SF₄ -> Sp³d non-planar

H₂O₂ -> Sp³ Non-planar

PCl₃ -> Sp³ Non –planar

[Al (OH)₄]^{- ->} Sp³ Non-planar

XeF₄ -> Sp³d² planar

XeO₃ -> Sp³ Non-planar

$P H_{4}^{-}$ -> Sp³ Non-planar

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8 months ago

Chemistry Class 12th

The oxidation state of manganese in the product obtained in a reaction of potassium permanganate and hydrogen peroxide in basic medium is___________.

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Vishal Baghel

Contributor-Level 10

$2 K M n O_{4} + 3 H_{2} O_{2} \to_{}^{B a s i c m e d i u m} 2 M n O_{2} + 3 O_{2} + 2 H_{2} O + 2 K O H$

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8 months ago

Chemistry Class 12th

Among the following ores Bauxite, Siderite, Cuprite, Calamine, Haematite, Kaolinite, Malachite, Magnetite, Sphalerite, Limonite, Cryolite, the number of principal ores if iron is ___________.

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Vishal Baghel

Contributor-Level 10

Bauxite = AlOx (OH)_3-2x (where O < x < 1)

Siderite = FeCO₃

Cuprite = Cu₂O

Calamine = ZnCO₃

Haemetite = Fe₂O₃

Kaolinite = Al₂ (OH)₄Si₂O₅

Malachite = CuCO₃ Cu (OH)₂

Magneite = Fe₃O₄

Sphalerite = ZnS

Limonite = Fe₂O₃.3H₂O

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8 months ago

Chemistry Chemical Kinetics

[A] -> [B]

Reactant Product

If formation of compound [B] follows the first order of kinetics and after 70 minutes the concentration of [A] was found to be half of its initial concentration. Then the rate constant of the reaction is x * 10^-⁶ s^-¹. The value of x is___________. (Nearest Integer)

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Vishal Baghel

Contributor-Level 10

$K = \frac{0.693}{t_{1 / 2}} = \frac{0.693}{70 * 60} = \frac{6930}{7 * 6} * 1 0^{- 6}$

= 165 * 10^-6 s^-1

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8 months ago

Chemistry Solutions

When a certain amount of solid A is dissolved in 100g of water at 25°C to make a dilute solution, the vapour pressure of the solution is reduced to one-half of that of pure water. The vapour pressure of pure water is 23.76 mmHg. The number of moles of solute A added is_________.

(Nearest Integer)

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Vishal Baghel

Contributor-Level 10

$\frac{P^{0} - P_{S}}{P^{0}} = \frac{n_{s o l u t e}}{n_{s o l v e n t}}$

$\frac{P^{0} - \frac{P^{0}}{2}}{P^{0}} = \frac{n_{s o l u t e}}{n_{s o l v e n t}}$

$n_{s o l u t e} = \frac{n_{s o l v e n t}}{2} = \frac{100}{18 * 2} = 2.78 m o l$

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8 months ago

Chemistry Thermodynamics

A gas (Molar mass = 280 g mol^-¹) was burnt in excess O₂ in a constant volume calorimeter and during combustion the temperature of calorimeter increased from 298.0 K to 298.45K. If the heat capacity of calorimeter is 2.5 kJ K^-¹ and enthalpy of combustion of gas is 9 kJ mol^-¹ the amount of gas burnt is _____________g. (Nearest Integer)

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Vishal Baghel

Contributor-Level 10

Let x gm is burnt

Moles = x/280

Heat released by x/280 mol = 2.5 * 0.45 kJ

Heat released by 1 mol = $\frac{2.5 * 0.45 * 280}{x} = k J$

$\begin{array}{l} Δ H = Δ U + Δ n g R T \\ Δ H = Δ U \end{array}$

$9 = \frac{2.5 * 280 * 0.45}{x}$

x = 35 gm

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8 months ago

Chemistry Class 11th

For a real at 25°C temperature and high pressure (99 bar) the value of compressibility factor is 2, so the value of Vander Waal's constant 'b' should be__________* 10^-² L mol^-¹. (Nearest Integer)

(Given R = 0.083 L bar K^-¹ mol^-¹)

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Vishal Baghel

Contributor-Level 10

For real gas under high pressure,

$Z = 1 + \frac{P b}{R T} \Rightarrow b = \frac{R T}{P} = \frac{0.083 * 298}{99}$

= 0.25 * 10^-2 L mol^-1

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