Electrical Conductors, Arrhenius Theory and Ostwald’s Dilution Law MCQs

Metal wires are used in electrical circuits because metals are excellent conductors. An electrical conductor is a material that allows electricity to flow through it easily, and some materials conduct electricity better than others. Arrhenius was the first scientist to propose the formation of ions in solution, a concept that supports the theory of acids and bases. Arrhenius’s theory also differentiates between strong and weak acids. Another important concept is Ostwald’s Dilution Law, which is an application of the law of mass action to dilute solutions. Ostwald published experimental results showing that for over two hundred weak organic acids, the dissociation constant (k) remained consistent across a wide range of concentrations from dilute to moderate.

If a conductor length is increased, 100% then keeping all other parameters fixed, what will be the increase in power dissipate?

(a) 100%
(b) 200%
(c) 300%
(d) 400%

Ostwald’s dilution law is applicable to

(a) strong electrolytes only
(b) weak electrolytes only
(c) non-electrolytes
(d) strong as well as weak electrolytes

What happens to the conductivity of semiconductors when there is an increase in temperature?

(a) decrease
(b) increase
(c) first, increase and then decrease
(d) remains constant

In the titration of iodine against hype the indicator used is

(a) starch
(b) potassium ferricyanide
(c) methyl orange
(d) methyl red

One litre of 0.5M KCl solution is electrolysed for one minute in a current of 16.08 mA. Considering 100% efficiency, the pH of the resulting solution will be

(a) 7
(b) 9
(c) 8
(d) 10

Semiconductors have electrical conductivity

(a) more than metals but less than insulators
(b) less than thermistor but more than an insulator
(c) equal to the thermistor
(d) less than metals but more than typical insulators

When acids dissolve in water it releases

(a) H⁺ ion
(b) H^– ion
(c) H₃O⁺ ion
(d) H₃O₂+ ion

Which element is always present in Arrhenius acid

(a) oxygen
(b) nitrogen
(c) hydrogen
(d) none of the above

When temperature increases the conductance of conductors is

(a) decrease
(b) increase
(c) first, increase and then decrease
(d) remains constant