Download App

Electrochemistry — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryElectrochemistry2 Marks
Question
How will the $pH$ of brine $($aq. $NaCl$ solution$)$ be affected when it is electrolysed?
✓

Answer

Aqueous solution of brine contains $Na+$, $CP,$ $H^+$ and $H^–.$ Electrode process are given as follows:
$2\text{H}^++2\text{e}^{-}\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ }\text{H}_2\ \ \ \ (\text{cathode})$
$2\text{Cl}^-\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ }\text{Cl}_2+2\text{e}\ \ \ \ (\text{Anode})$
Remaining solution will contain $NaOH,$ which is base, therefore, $pH$ will increase.

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 "2 Marks Questions" from Electrochemistry→Electrochemistry — all question types→Chemistry STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

Write note on oxides and oxoanions of $3d$ transition metals.
→
Explain the terms polymer and monomer.
→
Explain Electrolysis of molten NaCl
→
Differentiate between "minerals" and "ores".
→
Glucose is an aldohexose monosaccharide. Why does it react with hydrogen cyanide to form cyanohydrin but does not react with sodium hydrogen sulphite?
→
Write note on solubility of amine compounds. Explain which of the amine and alcohol compounds has higher solubility ? Why ?
→
Give the structures of A, B and C in the following reaction:
$\text{CH}_3\text{COOH}\xrightarrow[\Delta]{\text{NH}_3}\text{A}\xrightarrow[]{\text{NaOBr}}\text{B}\xrightarrow[]{\text{NaNO}_2/\text{HCl}}\text{C}$
→
Match the the compounds given in Column I with the effects given in Column II.
  Column I   Column II
$(i)$ Chloramphenicol $(a)$ Malaria
$(ii)$ Thyroxine $(b)$ Anaesthetic
$(iii)$ Chloroquine $(c)$ Typhoid fever
$(iv)$ Chloroform $(d)$ Goiter
    $(e)$ Blood substituent
→
How carboxylic acid is obtained from the hydrolysis of acyl chloride and acid anhydride? Give examples.
→
The following data were obtained during the first order thermal decomposition of $N_2O_5(g)$ at a constant volume:
$2N_2O_5(g) → 2N_2O_4(g) + O_2(g)$
S. No. Time/s Total pressure/atm
$1.$ $0$ $0.5$
$2.$ $100$ $0.512$
Calculate the rate constant.
→