a.

Alcohol

b.

Sodium acetate solution

c.

Sodium potassium in hydroxide

d.

Mercury

a.

Na, Al, P, Cl

b.

Cl, P, Al, Na

c.

Na, P, Cl, Al

d.

Al, Na, P, Cl

a.

The pH of N is increased whe the solution is diluted

b.

The pH of is increased when the solution is evaporated

c.

M is the most alkaline solution

d.

R is the most acidic solution

a.

Electrons flow towards the Zinc rod

b.

The Zinc rod dissolves

c.

The temperature of the soil changes

d.

The blue colour of the solution gradually disappears