Download App

Equilibrium — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryEquilibrium1 Mark
MCQ
Note : In the following questions a statement of Assertion $(A)$ followed by a statement of Reason $(R)$ is given. Choose the correct option out of the choices given\ below each question.
Assertion $(A)$ : A solution containing a mixture of acetic acid and sodium acetate maintains a constant value of $\ce{pH}$ on addition of small amounts of acid or alkali.
Reason $(R)$ : A solution containing a mixture of acetic acid and sodium acetate acts as a buffer solution around $\ce{pH}\ 4.75.$
  • A
    $A$ and $R$ both are correct, and $R$ is the correct explanation of $A.$
  • ✓
    $A$ and $R$ both are correct, but $R$ is not the correct explanation of $A$.
  • C
    $A$ is true but $R$ is false.
  • D
    $A$ and $R$ both are false.
✓

Answer

Correct option: B.
$A$ and $R$ both are correct, but $R$ is not the correct explanation of $A$.
The solutions which resist change in $\ce{pH}$ on dilution or with the addition of small amounts of acid or alkali are called buffer solutions.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Assertion (A) & Reason (B) MCQ" from Equilibrium→Equilibrium — all question types→Chemistry STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Select the members of group 14 that:
  1. Forms the most acidic dioxide.
  2. Is commonly found in +2 oxidation state.
  3. Used as semiconductor,.
  4. Exhibit highest catenation tendency.
→
In the following questions a statement of assertion $(A)$ followed by a statement of reason $(R)$ is given. Choose the correct option out of the choices given below each question.
Assertion $(A)$ : The compound cyclooctane has the following structural formula:

It is cyclic and has conjugated $8\pi-$ electron system but it is not an aromatic compound.
Reason $(R) : (4n + 2) \pi-$ electrons rule does not hold good and ring is not planar.
→
Note : In the following questions a statement of Assertion $(A)$ followed by a statement of Reason $(R)$ is given. Choose the correct option out of the choices given\ below each question.
Assertion $(A)$ : Aqueous solution of ammonium carbonate is basic.
Reason $(R)$ : Acidic/ basic nature of a salt solution of a salt of weak acid and weak base depends on $\mathrm{K}_{\mathrm{a}}$ and $\mathrm{K}_{\mathrm{b}}$ value of the acid and the base forming it.
→
Assertion (A): Each side of a cube is measured to be 7.203 m . What is the volume of the cube to appropriate significant figure $373.7 m^3$.
Reason (R): The mass of one mole of a substance in grams is called its average atomic mass.
→
Note : In the following questions a statement of Assertion $(A)$ followed by a statement of Reason $(R)$ is given. Choose the correct option out of the choices given below each question.
Assertion $(A)$ : Components of a mixture of red and blue inks can be separated by distributing the components between stationary and mobile phases in paper chromatography.
Reason $(R)$ : The coloured components of inks migrate at different rates because paper selectively retains different components according to the difference in their partition between the two phases.
→
In the following Questions, the Assertion and Reason hrve been put forfiird. Read the statements csrefully end choose the correct alternative from the following:
Assertion : A Mixture of $o-$ nitrophenol and $p-$ nitrophenol can be separated by steam distillation.
Reason : $p-$ nitrophenol is steam volatile while $o-$ nitrophenol is not steam volatile.
→
Assertion: Green house effect was observed in houses used to grow plants and these are made of green glass.
Reason: Green house name has been given because glass houses are made of green glass.
→
Note : In the following questions a statement of assertion $(A)$ followed by a statement of reason $(R)$ is given. Choose the correct option out of the choices given below each question.
Assertion $(A)$ : The decomposition of hydrogen peroxide to form water and oxygen is an example of disproportionation reaction.
Reason $(R)$ : The oxygen of peroxide is in $–1$ oxidation state and it is converted to zero oxidation state in $\mathrm{O}_2$ and –2 oxidation state in $\mathrm{H}_2 \mathrm{O}$.
→
Assertion (A): Same number of electron pairs are present in resonance structures.
Reason (R): Resonance structures differ in the location of electrons around the constituent atoms.
→
In the following questions a statement of assertion $(A)$ followed by a statement of reason $(R)$ is given. Choose the correct option out of the choices given below each question.
Assertion $(A)$ : Among isomeric pentanes, $2, 2-$ dimethylpentane has highest boiling point.
Reason $(R)$ : Branching does not affect the boiling point.
→