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8 months ago

Chemistry Chemistry Chemical Kinetics

2NO + 2H₂ → N₂ + 2H₂O

The above reaction has been studied at 800°C. The related data are given in the table below.

Reaction serial number	Initial Pressure of H₂ / kPa	Initial Pressure of NO / kPa	Initial rate (-dP/dT)/(kPa/s)
1	65.6	40.0	0.135
2	65.6	20.1	0.033
3.	38.6	65.6	0.214
4.	19.2	65.6	0.106

The order to the reaction with respect to NO is_______________.

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Payal Gupta

Contributor-Level 10

On decreasing pressure of NO by a factor of '2' the rate of reaction decreases by a factor of '4'

$∴$ Order of reaction w.r.t 'NO' = 2

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8 months ago

Chemistry Class 12th

20 mL of 0.02 M K₂Cr₂O₇ solution is used for the titraction of 10 mL of Fe²⁺ solution in the acidic medium. The molarity of Fe²⁺ solution is ___________* 10^-2 M. (Nearest Integer)

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Payal Gupta

Contributor-Level 10

Meq of K₂Cr₂O₇ = Meq of Fe²⁺

(Molarity * Volume * nf) of K₂Cr₂O₇ = (molarity * volume * nf) of Fe²⁺

0.02 * 20 * 6 = M * 10 * 1

M = 0.24 M

Molarity = 24 * 10^-² M

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New answer posted

8 months ago

Chemistry Physics

Is Math calculation important for BiPC students?

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Baskaran M

Contributor-Level 9

Math calculation is important for BiPC students as it is used in:

1. Physics and chemistry problem-solving

2. Biology for statistical analysis and modeling

3. Medical and health sciences

4. Research and data analysis

Basic math skills can benefit BiPC students in their academic and professional pursuits.

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8 months ago

Chemistry Class 12th

The total number of monobromo derivatives formed by the alkanes with molecular formula C₅H₁₂ is (excluding stereo isomers)___________.

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Payal Gupta

Contributor-Level 10

Consider the image below

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8 months ago

Chemistry Class 12th

The separation of two coloured substances was done by paper chromatography. The distance travelled by solvent front, substance A and substance B from the base line are 3.25cm, 2.08cmand 1.05cm, respectively. The ratio of R_f values of A to B is ________.

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Payal Gupta

Contributor-Level 10

$R_{f}^{0} = distance travelled by the solute$ $/$ $/ distance travelled by the solvent$

${(R_{f})}_{A} = \frac{2.08}{3.25} {(R_{f})}_{B} = \frac{1.05}{3.25}$

$\frac{{(R_{f})}_{A}}{{(R_{f})}_{B}} = \frac{2}{1}$

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8 months ago

Chemistry Class 12th

A sample of 4.5mg of an unknown monohydric alcohol, R-OH was added to methylmagnesium iodide. A gas is evolved and is collected and its volume measured to be 3.1 mL. The molecular weight of the unknown alcohol is ____________ g/mol.

[Nearest integer]

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Payal Gupta

Contributor-Level 10

(Calculation is done considering STP condition)

$R O H + C H_{3} M g l \to C H_{4} + R O M g l$

No. of moles ROH = no. of moles of CH4

$\frac{4.5 * 1 0^{- 3}}{M} = \frac{31}{22400} \Rightarrow 32.52 \approx 33 g m / m o l e$

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8 months ago

Chemistry Class 12th

The spin-only magnetic moment value of M³+ ion (in gaseous state) from the pairs Cr³⁺/Cr²⁺, Mn³⁺/Mn²⁺, Fe³⁺/Fe²⁺ and Co³⁺/Co²⁺ that has negative standard electrode potential, is________ B.M [Nearest integer]

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Payal Gupta

Contributor-Level 10

In given electrodes, only $E_{C r^{3 +} / C r^{2 +}}^{0}$ is negative

Cr (24) – [Ar] 4s¹3d⁵4p⁰

Number of unpaired electrons = 3

$μ = \sqrt[]{n (n + 2)} B M = \sqrt[]{3 (3 + 2)} B M = 3.97 B M \approx θ 4 B M$

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8 months ago

Chemistry Class 12th

The sum of number of lone pairs of electrons present on the central atoms of XeO₃, XeOF₄ and XeF₆, is___________.

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Payal Gupta

Contributor-Level 10

XeO₃ ⇒ Number of lone pair = 1

XeOF₄ ⇒ Number of lone pair = 1

XeF₆ ⇒ Number of lone pair = 1

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8 months ago

Chemistry Chemistry Chemical Kinetics

For the decomposition of azomethane,

CH₃N₂CH₃(g) → CH₃CH₃(g) + N₂(g), a first order reaction, the variation in partial pressure with time at 600 K is given as.

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Payal Gupta

Contributor-Level 10

For first order reaction,

$l n (\frac{P}{P_{0}}) = - k . t$

$K = 3.465 * 1 0^{4}$

$t_{1 / 2} = \frac{0.693}{3.465 * 1 0^{4}} = 2 * 1 0^{- 5}$ sec

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8 months ago

Chemistry Class 11th

While performing a thermodynamics experiment, a student made the following observation.

HCl + NaOH → NaCl + H₂O $Δ H$ = -57.3 kJ mol^?1

CH₃COOH + NaOH → CH₃COONa + H₂O $Δ H$ = -55.3 kJ mol^-1

The enthalpy of ionization of CH₃COOH as calculated by the student is _________kJ mol^-1. (nearest integer)

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Payal Gupta

Contributor-Level 10

$Δ H_{i o n i z a t i o n} o f C H_{3} C O O H = - 55.3 (- 57.3)$

= 2 KJ/mole

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