NEET UG CHEMISTRY MCQ: ELECTRO CHEMISTRY

1 Easy

1 of 1

Analyzing +4 | -1

A volume of

100 \mathrm{~ml}

of a buffer of

1 \mathrm{~M}-\mathrm{NH}_3

and

1 \mathrm{~M}-\mathrm{NH}_4^{+}

is placed in two half-cells connected by a salt bridge. A current of

1.5 \mathrm{~A}

is passed through the cell for

20 \mathrm{~min}.

If electrolysis of water takes place only and the electrode reactions are:

Right:

2 \mathrm{H}_2 \mathrm{O}+\mathrm{O}_2+4 \mathrm{e} \rightarrow 4 \mathrm{OH}^{-}

and Left:

2 \mathrm{H}_2 \mathrm{O} \rightarrow 4 \mathrm{H}^{+}+\mathrm{O}_2+4 \mathrm{e}

, then, the

\mathrm{pH}

View answer and explanation

Correct option: A

Right electrode will increase

Option A (Right electrode will increase) is correct because the electrolysis of water at the right electrode produces hydroxide ions, increasing the pH.

More Questions from ELECTRO CHEMISTRY

Practice All Chapter MCQs →

4.5 g of Al (at. mass 27 amu) is deposited at cathode from

A{l^{3 + }}

solution by a certain quantity of charge. The volume of

{H_2}

produced at STP from

{H^ + }

ions in solution by the same quantity of charge will be : The correct order of molar conductivity at infinite dilution of

\mathrm{LiCl},{\rm{NaCl {\kern 1pt}{\kern 1pt}and {\kern 1pt}{\kern 1pt}KCl}}

is A solution of copper sulphate

\left(\mathrm{CuSO}_4\right)

is electrolysed for 10 minutes with a current of 1.5 amperes. The mass of copper deposited at the cathode (at. mass of Cu = 63 u) is The desired amount of charge for obtaining one mole of Al from

\mathrm{A}{\mathrm{l}^{3 + }}

is When an aqueous solution of lithium chloride is electrolysed using graphite electrodes : Which are used as secondary reference electrodes?