Chemistry MCQ

Assertion (A): Burning of magnesium ribbon to form MgO is a redox reaction.
Reason (R): Magnesium undergoes oxidation and oxygen undergoes reduction.

Assertion (A): The nature of the anode determines the selective discharge of anions migrating towards it.
Reason (R): The anode can be inert or active.

Assertion (A): Articles to be electroplated must be very clean.
Reason (R): Any impurity present will not allow a firm deposit on the surface of the article.

The sulphuric acid added to copper sulphate:

During the electrolysis of normal solution of Cu(II) chloride using graphite electrodes, the anion which going to discharge at anode is:

The process of extraction of metals from the fused purified ores by the process of electrolysis called:

The process of formation of cations and anions from the molecules of polar covalent compounds on dissolving in water is called:

During the electrolysis of acidulated water, OH^- ions are:

During the electrolysis of acidulated water, H⁺ ions are:

The compound which liberates reddish brown gas around anode during electrolysis is:

Alcohol does not conduct electric current because of:

In above the graphite electrodes are used, because the bromine discharged during electrolysis.

Molten lead bromide is electrolysed using graphite electrodes. The bromine anions:

A solid ionic compound does not conduct electricity because of:

The reaction taking place at anode during silver plating is:

The electrolyte used during silver plating of copper article is:

A aqueous solution consists of assorted ions. The ion which will discharge more readily is:

Copper chloride solution is electrolysed using graphite electrodes. Then ionic reaction at cathode is :

If K^+, H⁺ and Pb²⁺ ions migrate to cathode, such that concentration of K⁺ ions is very high then the ion likely to discharge at cathode is:

Na⁺ and H⁺ ions migrate to platinum cathode. The ion which is likely to discharge is:

OH^- and Cl^- ions migrate to platinum anode, such that concentration of Cl^- ions is very high. The ion which discharges is:

The ions present in an electrolyte are Na⁺, H⁺, Pb2⁺, K⁺. Their order of preferential discharge during electrolysis is:

Amongst Cs, Na, Li, K, Rb the least reactive metal is:

During silver plating of an article using potassium argentocyanide as an electrolyte, the anode material should be:

Dilute sodium chloride solution is electrolysed using graphite electrodes. The cation which is discharged at cathode is:

The ion which discharges at anode during electrolysis of copper sulphate solution using copper electrodes.

The metallic electrode which does not take part in electrolytic reaction is:

The ion which most readily discharges at cathode is: