Download App

6.2. Equilibrium - II (icon Equilibrium) — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry6.2. Equilibrium - II (icon Equilibrium)1 Mark
MCQ
Given below are two statements.

Statement $I:$ In the titration between strong acid and weak base methyl orange is suitable as an indicator.

Statement $II:$ For titration of acetic acid with $\mathrm{NaOH}$ phenolphthalein is not a suitable indicator.

In the light of the above statements, choose the most appropriate answer from the options given below:

  • A
    Statement $I$ is false but Statement $II$ is true
  • ✓
    Statement $I$ is true but Statement $II$ is false
  • C
    Both Statement $I$ and Statement $II$ are true
  • D
    Both Statement $I$ and Statement $II$ are false
✓

Answer

Correct option: B.
Statement $I$ is true but Statement $II$ is false
b
Titration curve for strong acid and weak base initially a buffer of weak base and conjugate acid is:

Formed, thus $\mathrm{pH}$ falls slowly and after equivalence point, so the $\mathrm{pH}$ falls sharply so methyl arrange, having $\mathrm{pH}$ range of $3.2$ to $4.4$ will weak as indicator. So statement$-I$ is correct.

Titration curve for weak acid and strong base $(\mathrm{NaOH})$ Initially weak acid will form a buffer so $\mathrm{pH}$ increases slowly but after equivalence point. it rises sharply covering range of phenolphthalein so it will be suitable indicator so statement$-II$ is false.

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 "M.C.Q (1 Marks)" from 6.2. Equilibrium - II (icon Equilibrium)→6.2. Equilibrium - II (icon Equilibrium) — all question types→Chemistry STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Which will undergo a Friedel-Craft's alkylation reaction :
→
The reaction for which ${K_c} \leq {K_p}$ at $298\ K$
→
If the enthalpy of vaporization for water is $186.5\, kJ$ $mo{l^{ - 1}}$, the entropy of its vaporization will be......$J{K^{ - 1}}\,mo{l^{ - 1}}$
→
Acetylene can be prepared from
→
For the configuration (image) which rule is violated ?
 
→
A litre contains $2\,moles$ of $PCl_5$ initially. If $K_c$ is found to be $1$ , the degree of dissociation of: $PCl_5$ is $PC{l_5}(g) \rightleftharpoons PC{l_3}(g) + C{l_2}(g)$ 
→
The correct order of increasing bond angles is
→
In the reaction $,2 \mathrm{KClO}_3 \rightarrow 2 \mathrm{KCl}+3 \mathrm{O}_2,$ the elements which have been oxidised and reduced respectively are :
→
Assertion : Many endothermic reactions that are not spontaneous at room temperature become spontaneous at high temperature.
Reason : Entropy of the system increases with increase in temperature.
→
The density of ' $x$ ' $\mathrm{M}$ solution (' $\mathrm{x}$ ' molar) of $\mathrm{NaOH}$ is $1.12 \mathrm{~g} \mathrm{~mL}^{-1}$. while in molality, the concentration of the solution is $3 \mathrm{~m}$ ( $3 \mathrm{molal})$. Then $\mathrm{x}$ is

(Given : Molar mass of $\mathrm{NaOH}$ is $40 \mathrm{~g} / \mathrm{mol}$ )

→