Ncert Solutions Chemistry Class 11th

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New answer posted•a year ago

Ncert Solutions Chemistry Class 11th Class 11th

4.5g of compound A (MW = 90) was used to make 250 mL of its aqueous solution. The molarity of the solution in M is × 10^-1. The value of x is_________ (Rounded off to the nearest integer)

6 Views|Posted a year ago

Asked by Alok Kumar Singh

Answered by

Alok Kumar Singh | Contributor-Level 10

a year ago

W = 4.5 g

M.W = 90

V = 250 ml

Using M = $\frac{W}{M . W \times V} \times 1000$

$M = \frac{4.5}{90 \times 250} \times 1000 = 0.2$

M = 2 × 10^-1 M

So, x = 2

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New answer posted•a year ago

Ncert Solutions Chemistry Class 11th 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]

5 Views|Posted a year ago

Asked by Vishal Baghel

Answered by

Vishal Baghel | Contributor-Level 10

a year ago

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 $\frac{85000}{23000} \times 3500$

= 12934.78 mg

= 12.93478 gm

$≅ 13$

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New answer posted•a year ago

Ncert Solutions Chemistry Class 11th Class 11th

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…………….

4 Views|Posted a year ago

Asked by Vishal Baghel

Answered by

Vishal Baghel | Contributor-Level 10

a year ago

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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New answer posted•a year ago

Ncert Solutions Chemistry Class 11th Class 11th

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]

6 Views|Posted a year ago

Asked by Vishal Baghel

Answered by

Vishal Baghel | Contributor-Level 10

a year ago

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

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

the nearest integer is 1

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New answer posted•a year ago

Ncert Solutions Chemistry Class 11th Class 11th

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

4 Views|Posted a year ago

Asked by Alok Kumar Singh

Answered by

Alok Kumar Singh | Contributor-Level 10

a year ago

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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New answer posted•a year ago

Ncert Solutions Chemistry Class 11th Class 11th