13 Which of the following are not considered as mixtures
a. Colloid
C. solution
b. Compound
d. suspension


14. Which of the following lists contain pure elements?
a. Air, water, fire, earth
c hydrogen, oxygen, brass
b. Air, water, oxygen
d. sodium, nitrogen, oxygen



15. Matter is anything that occupies

a. Space
c. Both A and B
b. Has mass
d. none of these


16. A ph scale reading of less than 7 indicates alan medium

a. Acidic
C. neutral
b. Basic
d. unknown


17. Phenolphtalein solution turn bases

a. Colorless
c. reddish pink .
b. Green
d. yellow



18. A ph scale reading of indicates a weak base
a. 2
b. 6
C. 8
d.13​