For an experiment, a student needs a compound that has the following properties.
• It dissolves in water.
• It is an electrolyte.
• It is excellent conductor of electricity.
Which substance would be the best choice for the experiment?
O methanol
O acetic acid
O distilled water
O potassium chloride

The potassium chloride would be the best choice for the experiment.

Option: D

Explanation:

KCl is soluble in a multitude of polar solvents like very soluble in water and get split into K+ and Cl-. KCl solutions are general standards for calibrating the electrical conductivity of ionic solutions, for instance, because KCl solutions are robust, enabling repeatable observations.

This is basically completely ionized in aqueous solution into solved K+ and Cl– ions. Due to its ionic property considered as excellent conductor of electricity. This is because on adding water the potassium ion approach oxygen of water while chlorine ion target hydrogen, being opposite charges.

1 a

2 d

3 a

4 c

explanation:

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.