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Chemistry Chemistry Electrochemistry

A solution of Fe₂(SO₄)₃ is electrolyzed for 'x' min with a current of 1.5 A to deposit 0.3482g of Fe. The value of x is ______. [nearest integer]

Given : 1F = 96500 C mol1

Atomic mass of Fe = 56 g mol1

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Raj Pandey

Contributor-Level 9

$F e^{+ 3} + 3 e^{-} \to F e$

3 Faraday is required to deposit 1 mole Fe

$? 56 g$ deposited by $3 * 96500$ C charge

$∴ 0.3482 g$ deposited by $\frac{3 * 96500}{56} * 0.3482 C = \frac{100803.9}{56} C = 1800.7 C$

$∴ Q = I t$

1800.07 = 1.5 t

$∴ t = 1200 s e c = \frac{1200}{60}$ min = 20 min

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a year ago

Chemistry Chemistry Chemical Kinetics

At 345 K, the half life for the decomposition of a sample of a gaseous compound initially at 55.5 kPa was 340s. When the pressure was 27.8 kPa., the half life was found to be 170s. The order of the reaction is ________. [integer answer]

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Raj Pandey

Contributor-Level 9

t1/2 = 340 secP0 = 55.5 kPa

t1/2 = 170 sec P0 = 27.8 kPa

$∴ t_{1 / 2} \propto {(P_{0})}^{1 - n}$

$∴ 1 - n = 1 n = 0$

$∴$ zero order reaction

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a year ago

Chemistry Class 11th

Amongst BeF2, BF3, H2O, NH3, CCl4 and HCl, the number of molecules with non-zero net dipole moment is_________.

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Raj Pandey

Contributor-Level 9

$F - B e - F$ $μ = 0$

BF3 $μ = 0$

H2O $μ \neq 0$

NH3 $μ \neq 0$

CCl4 $μ = 0$

HCl $μ \neq 0$

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a year ago

Chemistry Class 11th

A rigid nitrogen tank stored inside a laboratory has a pressure of 30 atm at 06:00 am when the temperature is $27 ° C$ . At 03:00 pm, when the temperature is $45 ° C$ , the pressure in the tank will be___________atm. [nearest integer]

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Raj Pandey

Contributor-Level 9

$T_{1} = 27 ° C = 300 K$ T2 = 45° C = 45 + 273 = 318 K

P1 = 30 atmP2 =?

V is constant due to rigid tank\

$∴ \frac{P_{1}}{T_{1}} = \frac{P_{2}}{T_{2}}$

$\frac{30}{300} = \frac{P_{2}}{318} ∴ P_{2} = \frac{1}{10} * 318 = 31.8 a t m \approx 32 a t m$

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a year ago

Chemistry Biomolecules

A protein 'A' contains 0.30? of glycine (molecular weight 75). The minimum molar mass of the protein 'A' is ___________* 10³g mol^-1 [nearest integer]

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