Class 11th

The NaNO₃ weighed out to make 50 mL of an aqueous solution containing 70.0mg Na⁺ per mL is…………. g. (Rounded off to the nearest integer)

[Given ; Atomic weight in g mol^-1 -Na : 23; N : 14; O : 16]

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Contributor-Level 10

Mass of Na⁺ in 50 ml = 70 * 50 = 3500 mg

23000 mg of Na⁺ is present in 85000 mg of NaNO₃ (1 mole NaNO₃ contains 1 mole Na⁺)

$∴ 3500$ mg Na⁺ will be present in $\frac{85000}{23000} * 3500$

= 12934.78 mg

= 12.93478 gm

$≅ 13$

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7 months ago

Class 11th 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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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 = $\frac{4}{3}$

...more

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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7 months ago

The pH of ammonium phosphate solution, if pk_a of phosphoric acid and pK_b of ammonium hydroxide are 5.23 and 4.75 respectively, is…………….

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Contributor-Level 10

pH = $\frac{1}{2} [p K_{w} + p K_{a} - p K_{b}]$ $\frac{}{}_{}_{}_{}$

$= \frac{1}{2} [14 + 4.75 - 5.23]$

$= 6.76 ≅ 7$

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7 months ago

A ball weighing 10g is moving with a velocity of 90 ms^-1. If the uncertainty in its velocity is 5%, then the uncertainty in its position is…………* 10^-33m. (Rounded off to the nearest integer)

[Given: h = 6.63 * 10^-34 Js]

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Contributor-Level 10

Uncertainty in speed = 90 $* \frac{5}{100} = 4.5 m / s = Δ V$ $\frac{}{}$

$Δ x = \frac{h}{4 π m Δ V} = \frac{6.63 * 1 0^{- 34}}{4 * 3.14 * 1 0^{- 2} * 4.5} = 1.173 * 1 0^{- 33}$

the nearest integer is 1

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7 months ago

Class 11th Equilibrium

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 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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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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7 months ago

The gas released during anaerobic degradation of vegetation may lead to:

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Contributor-Level 10

Methane gas is produced during anaerobic degradation of vegetation that leads to global warming so considered as greenhouse gas like CO₂. Also it causes cancer.

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7 months ago

Which pair oxides in acidic in nature?

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Class 11th Chemical Bonding and Molecular Structure

Contributor-Level 10

Oxide Nature

CaO Basic

B₂O₃ Acidic

SiO₂ Acidic

BaO Basic

N₂O

...more

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7 months ago

Match List-I with List-II.

List-I List-II

(Molecule) &nb

...more

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Class 11th Chemistry Chemical Bonding and Molecular Structure

Contributor-Level 10

Species B.O

Ne₂ 0

N₂ 3

F₂ 1

O₂ &n

...more

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7 months ago

Which of the following are isostructural pairs?

A. $S O_{4}^{2 -} a n d C r O_{4}^{2 -}$

B. SiCl₄ and TiCl₄

C. NH₃ and $N O_{3}^{-}$

D. BCl₃ and BrCl₃

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Contributor-Level 10

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7 months ago

Class 11th Hydrocarbons

In $\overset{1}{C} H_{2} = \overset{2}{C} = \overset{3}{C} H - \overset{4}{C} H_{3}$ molecule, the hybridization of carbon 1,2,3 and 4 respectively are:

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