An aqueous solution of sodium chloride is placed in an electric circuit. A light bulb connected ...?

Question

to the circuit is weakly illuminated, showing that a weak current is passing through it. How can the conductivity of the solution be increased?
a)by doubling the amount of water in the solution
b)by adding calcium chloride (CaCl2) to the solution
c)by bubbling oxygen gas (O2) through the solution
d)by increasing the quantity of the solution

Answer 1

B - By adding calcium chloride to the solution. Calcium chloride is an ionic compound and will dissociate into Ca2+ and 2Cl- ions which will conduct the electricity and so increase the conductivity.

A - doubling the amount of water will dilute the solution and
so reduce the conductivity

C - Bubbling oxygen will not affect the conductivity

D - this will increase the overall number of ions but not the
number of ioins per unit volume and so the conductivity
will not increase.

Answer 2

definately by increasing the amount of water in the solution as ions of sodium chloride will ionise more and the ionic speed of the ions willincrease which will lead to more conduction of current........... and ur bulb will glow well