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11 months ago

Chemistry Class 12th

Consider the following metal complexes:

[Co(NH₃)₆]³⁺

[CoCl(NH₃)₅]²⁺

[Co(CN)₆]^3-

[Co(NH₃)₅(H₂O)]³⁺

The spin-only magnetic moment value of the complex that absorbes light with shortest wavelength is _____________. B.M (Nearest integer)

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Vishal Baghel

Contributor-Level 10

Complex absorbing minimum wavelength of light means the value of $Δ$ for it is maximum.

That complex will be ${[C o {(C N)}_{6}]}^{3 -}$ ${_{}}^{}$

$C o^{3 +} \Rightarrow 3 d^{6} 4 s^{0} \Rightarrow t_{2} g^{6} e g^{0}$

No. of unpaired electron = 0

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11 months ago

Chemistry Chemical Kinetics

The half life for the decomposition of gaseous compound A is 240s when the gaseous pressure was 500 Torr initially, When the pressure was 250 Torr, the half life was found to be 4.0 min. The order of the reaction is _________. (Nearest integer)

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Vishal Baghel

Contributor-Level 10

$\frac{{(t_{1 / 2})}_{l}}{{(t_{1 / 2})}_{I I}} = {(\frac{P_{I}}{P_{I I}})}^{1 - n} \Rightarrow n = 1$

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11 months ago

Chemistry Electrochemistry

The cell potential for $Z n | Z n^{2 +} (a q) ? S n^{* +} | S n$ is 0.801 V at 298 K. The reaction quotient of the above reaction is 10^-2. The number of electrons involved in the given electrochemical cell reaction is _________.

(Given: $E_{Z n^{2 +} | Z n}^{o} = - 0.763 V, E_{S n^{* +} | S n}^{o} = + 0.008 V a n d \frac{2.303 R T}{F} = 0.06 V)$

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Vishal Baghel

Contributor-Level 10

$A n o d e : (Z n \to Z n^{2 +} + 2 e) * x$

$C a t h o d e : \underline{(S n^{x +} + x e \to S n) * 2}$

Net call reaction : $x Z n + 2 S n^{x +} \to x Z n^{2 +} + 2 S n (n = 2 x)$

Using Nernst equation

No. of electron involved = 4

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11 months ago

Chemistry Class 11th

The pressure of a moist gas at $27 ° C$ is 0.04 atm. The volume of the container is doubled at the same temperature. The new pressure of the moist gas is _______ * 10^-1atm. (Nearest integer)

(Given: The vapour pressure of water at $27 ° C$ is 0.4 atm)

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Vishal Baghel

Contributor-Level 10

Pressure of gas = pressure of moist gas – Vapour pressure of water

= 4 atm – 0.4 atm

= 3.6 atm

On doubling the volume, pressure of gas is halved :

Total pressure = $(\frac{3.6}{2} + 0.4) = 2.2 a t m$

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11 months ago

Chemistry Structure of Atom

Among the following species

$N_{2}, N_{2}^{+}, N_{2}^{-}, N_{2}^{2 -}, O_{2}, O_{2}^{+}, O_{2}^{-}, O_{2}^{2 -}$

The number of species showing diamagnesim is __________.

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Vishal Baghel

Contributor-Level 10

In N₂ & $O_{2}^{2 -} \to$ no. of unpaired electron = 0

In other species ® no. of unpaired electron $\neq$ 0

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11 months ago

Chemistry Class 12th

The number of chlorine atoms in bithionol is_____________.

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Payal Gupta

Contributor-Level 10

Structure of Bithinol is;

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11 months ago

Chemistry Class 11th

The number of stereoisomers formed in a reaction of

$(\pm) P h (C = O) C (O H) (C N) P h w i t h H C N i s____________.$

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Payal Gupta

Contributor-Level 10

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11 months ago

Chemistry Class 12th

A 1.84 mg sample of polyhydric alcoholic compound 'X' of molar mass 92.0 g/mol gave 1.344mL of H₂ gas at STP. The number of alcoholic hydrogens present in compound 'X' is_________.

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