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Chemistry Class 11th

Which among the following is a false statement ?

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Vishal Baghel

Contributor-Level 10

(A) SiO? has three-dimensional network structure of Si – O bonds; while carbon dioxide consists of discrete CO? molecules. SiO? is solid, whereas CO? is a gas
(B) Because of its great affinity for oxygen, Si always occurs as the oxide, silica (SiO? ) or in the form of silicates, which are the compounds of SiO? with other metal oxides.
(C) SiO? + 2Mg → Si + 2MgO
(D) The reluctance of silicon to form pπ – pπ bonds to itself is clearly shown by the fact that silicon does not exist in graphite-like structure, but only in diamond like structure.

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Chemistry Class 12th

The reaction

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Raj Pandey

Contributor-Level 9

Kindly consider the following Image

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Chemistry Class 12th

The reaction of sulphur in alkaline medium is given below

$S_{8 (s)} + a O {H^{-}}_{(a q)} \to b {S^{2 -}}_{(a q)} + c S_{2} {O_{3}^{2 -}}_{(a q)} + d H_{2} O_{(I)}$

The values of 'a' is____________. (Integer answer)

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alok kumar singh

Contributor-Level 10

The balanced equation is :

$S_{8} (s) + 12 O H^{-} (a q) \to 4 S^{2 -} (a q) + 2 S_{2} O_{3}^{2 -} (a q) + 6 H_{2} O (l)$

Here ; a = 12

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Chemistry Class 12th

When 9.45g of ClCH₂COOH is added to 500ml. of water, its freezing point drops by 0.5°C. The dissociation constant of ClCH₂ COOH is x * 10^-3. The value of x is__________ (Rounded off to the nearest integer)

$[k_{f (H_{2} O)} = 1.86 K k g m o l^{- 1}]$

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alok kumar singh

Contributor-Level 10

$Δ T_{f} = 0.5 ° C$

K_f = 1.86

Using, density of water = 1g / mL

i = ?

$Δ T_{f} = i k_{f} . m$

$0.5 = i * 1.86 * \frac{9.45}{94.5 * 500} * 1000$

i = 1.344

Now, using $α = \frac{i - 1}{n - 1}$

n for ClCH₂COOH = 2

a = $\frac{1.344 - 1}{2 - 1} = 0.344$

Using

$K_{a} = \frac{C α^{2}}{1 - α}$

$K_{a} = \frac{0.2 * {(0.344)}^{3}}{0.66} = 36 * 1 0^{- 3}$

So; x = 36

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Chemistry Class 12th

The correct order of reactivity for the nucleophilic addition reaction of the following carbonyl compounds with ethyl magnesium iodide is:

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Vishal Baghel

Contributor-Level 10

If the carbonyl compound is sterically crowded, then it will be reluctant to undergo addition reaction. Moreover, attachment of bulkier alkyl group with the carbonyl carbon decreases the partial positive charge resulting into the minimization of attack by R? from RMgBr. So, the order is

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Chemistry Equilibrium

At 1990K and 1 atm pressure, there are equal number of Cl₂ molecules and Cl atoms in the reaction mixture. The value of K_P for the reaction Cl_2(g) $?$ 2Cl_(g) under the above conditions is x * 10^-1. The value of x is______ (Rounded off to the nearest integer)

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alok kumar singh

Contributor-Level 10

$C l_{2 (g)} ? 2 C l_{(g)}$

Initially -> 1 mol -

At eq. 1-x mol 2x mol

Here; molecules of Cl₂ = atoms of Cl

i.e moles of Cl₂ = moles of Cl

So : 1 – x = 2x x = 1/3

Moles of Cl₂ at equ

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$C l_{2 (g)} ? 2 C l_{(g)}$

Initially -> 1 mol -

At eq. 1-x mol 2x mol

Here; molecules of Cl₂ = atoms of Cl

i.e moles of Cl₂ = moles of Cl

So : 1 – x = 2x x = 1/3

Moles of Cl₂ at equibrium = $\frac{2}{3}$

Moles of Cl at equilibrium = $\frac{2}{3}$

Total moles = $\frac{4}{3}$

Now: $P_{C l_{2}} = \frac{2}{4} * 1 a t m$

$= \frac{1}{2} a t m$

$P_{C l} = \frac{2}{4} * 1 a t m = \frac{1}{2} a t m$

$K_{P} = \frac{{(P_{C l})}^{2}}{P_{C l_{2}}} = \frac{{(\frac{1}{2})}^{2}}{\frac{1}{2}} = \frac{1}{2}$

$K_{P} = 0.5 = 5 * 1 0^{- 1}$

Here : x = 5

less

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Chemistry Class 12th

In the following reaction:

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Raj Pandey

Contributor-Level 9

Kindly consider the following Image

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Chemistry Class 12th

The product 'X' formed in following reaction is:

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Vishal Baghel

Contributor-Level 10

Here cyclohexanone is formed as follows

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Chemistry Class 11th

For the reaction A_(g) -> B_(g) the value of the equilibrium constant at 300K and 1 atm is equal to 100.0 The value of $Δ_{r} G$ for the reaction at 300K and 1 atm in J mol^-¹ is -xR, where x is_________.

(Rounded off to the nearest integer)

[R = 8.31 J mol^-¹ K^-¹ and In 10 = 2.3]

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alok kumar singh

Contributor-Level 10

A (g) -> B (g) K_P = 100

$Δ G$ at 300 K and 1 atm

Using

$Δ G = - R T l n K_{P}$

$Δ G = - R * 300 l n 100$

=-R * 300 * 2 * 2.3

$Δ G = - 1380 R$

So; x = 1380.

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9 months ago

Chemistry Chemistry Coordination Compounds

The stepwise formation of ${[C u {(N H_{3})}_{4}]}^{2}^{+}$ is given below:

$C u^{2 +} + N H_{3} \overset{k_{1}}{⇌} {[C u (N H_{3})]}^{2 +}$

${[C u (N H_{3})]}^{2 +} + N H_{3} \overset{k_{2}}{⇌} {[C u {(N H_{3})}_{2}]}^{2 +}$

${[C u {(N H_{3})}_{2}]}^{2 +} + N H_{3} \overset{k_{3}}{⇌} {[C u {(N H_{3})}_{3}]}^{2 +}$

${[C u {(N H_{3})}_{3}]}^{2 +} + N H_{3} \overset{k_{4}}{⇌} {[C u {(N H_{3})}_{4}]}^{2 +}$

The value of stability constants k₁, k₂, k₃ and k₄ are $1 0^{4}, 1.58 * 1 0^{3}, 5 * 1 0^{2} a n d 1 0^{2}$ respectively.

The overall equilibrium constants for dissociation of ${[C u {(N H_{3})}_{4}]}^{2 +} i s x * 1 0^{- 12} .$ The value of x is________ (Rounded off to the nearest integer)

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alok kumar singh

Contributor-Level 10

Stability constant are :

K₁ = 10⁴

K₂ = 1.58 * 10³

K₃ = 5 * 10²

K₄ = 10²

Overall stability constant K will be

K = K₁ * K₂ * K₃ * K₄

= 7.9 * 10¹¹

Now, overall equilibrium constant for dissociation of [Cu (NH₃)₄]²⁺ is

$K' = \frac{1}{K} = \frac{1}{7.9 * 1 0^{11}} = 0.126 * 1 0^{- 11}$

= 1.26 * 10^-12

So; x = 1 (Rounded off to the nearest integer)

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