1 Marks Question

Questions · Page 2 of 2

Question 511 Mark

Why is Lewis concept more useful than Bronsted Lowry concept?

Answer

Lewis concept includes some of compounds like $\mathrm{BF}_3, \mathrm{BCl}_3, \mathrm{AlCl}_3$ as acids which Bronsted Lowry concept does not.

View full question & answer→

Question 521 Mark

Is it possible to get precipitate of Is it possible to get precipitate of $\mathrm{Fe}(\mathrm{OH})_3$ at $\mathrm{pH}=2$ ? Give reason.? Give reason.

Answer

No, because $\mathrm{Fe}(\mathrm{OH})_3$ will dissolve in strongly acidic medium.

View full question & answer→

Question 531 Mark

Why pH of our blood remains constant at 7.4 through we quite often eat spicy food?

Answer

Blood contains basic buffer which keep its pH constant.

View full question & answer→

Question 541 Mark

Write the expression for the equilibrium constant ($\text{K}_{\text{c}}$) for the reaction:
$\text{CH}_3\text{COOC}_2\text{H}_5(\text{aq})+\text{H}_2\text{O(l)}\\\rightleftharpoons\text{CH}_3\text{COOH}
(\text{aq})+\text{C}_2\text{H}_5\text{OH}(\text{aq})$

Answer

$\text{K}_{\text{c}}=\frac{[\text{CH}_3\text{COOH}][\text{C}_2\text{H}_5\text{OH}]}{[\text{CH}_3\text{COOC}_2\text{H}_2\text{H}_5][\text{H}_2\text{O}]}$

View full question & answer→

Question 551 Mark

Which of the following is strongest Lewis acid? $\text{CCl}_4,\text{AlCl}_3,\text{NCl}_3,\text{OCl}_2$

Answer

$\text{AlCl}_3$ is strongest Lewis acid because its octet is not complete.

View full question & answer→

Question 561 Mark

Write the equilibrium constant expression for following reaction:
$2\text{NOCl}(\text{g})\rightleftharpoons2\text{NO(g)}+\text{Cl}_2(\text{g})$

Answer

$\text{K}=\frac{[\text{NO}^2][\text{Cl}_2]}{[\text{NOCl}^2]}$

View full question & answer→

Question 571 Mark

$\text{SO}_3^{2-}$ is Bronsted base or acid and why?

Answer

$\text{SO}_3^{2-}$ is Bronsted base because it can accept $\text{H}^+$.

View full question & answer→

Question 581 Mark

What is the conjugate base of $\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$?

Answer

$\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_5 \mathrm{OH}\right]^{2+}$ is conjugate base of $\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$.

View full question & answer→

Question 591 Mark

Fizz is observed when soda water bottle is opened. Why?

Answer

Pressure is decreased, solubility of $\text{CO}_2$ in water decreases, $\text{CO}_2$ escapes from cold drink bottle.

View full question & answer→

Question 601 Mark

Which of the following is strongest conjugate base? $\text{CH}_3^-,\text{NH}^-_2,\text{OH}^-,\text{F}^-$

Answer

$\text{CH}_4^-$ is strongest conjugate base because $\text{CH}_4$ is weakest acid, i.e., cannot donate $\text{H}^+$ easily.

View full question & answer→

Question 611 Mark

Write expression of $\text{K}_{\text{c}}$ for reaction:
$\text{N}_2(\text{g})+3\text{H}_2(\text{g})\rightleftharpoons2\text{NH}_3(\text{g})$
Give units of K.

Answer

$\text{K}=\frac{[\text{NH}_3]^2}{[\text{N}_2][\text{H}_2]^3}$
$=\frac{(\text{mol L}^{-1})^2}{(\text{mol}^{-1})(\text{mol L}^{-1})^3}=\text{L}^2\text{mol}^{-2}$

View full question & answer→

Question 621 Mark

How does common ion affect the solubility of electrolyte?

Answer

Solubility of electroyte decreases due to common ion effect.

View full question & answer→

Question 631 Mark

Write the conjugate acid for the Bronsted base $\text{C}_6\text{H}_5\text{OH},\text{H}_2\text{O}$

Answer

$\ \ \ \ \ \ \ \ \oplus{}\ \ \ \ \ \ \ \ \ \ \oplus{}\\\text{C}_6\text{H}_5\text{OH}_2,\text{H}_3\text{O}$

View full question & answer→

Question 641 Mark