PH is define as

A. [H+]

B. –log [H]

C. –log [H+]

D. log [H]

E. log [H+]

Matter is neither created nor destroyed in the course of any chemical reactions is a statement of the law of

A. combining volumes

B. conservation of mass

C. definite proportion

D. multiple proportion

E. reciprocal proportion.

Bauxite is the ore of

A. aluminium

B. calcium

C. Iron

D. sodium

E. magnesium

An element Z has a combining power of 3. Which of the following formulae is correct of its compound?

A. ZS₃

B. ZSO₃

C. ZS0₄

D. Z0₃

E. Z₃Cl₂

The following acids are monobasic EXCEPT

A. dioxonitrate (Ill) acid

B. ethanedioic acid

C. hydrobromic acid

D. methanoic acid

E. oxochlorate (I) acid

Which of these arrangement of elements is in order of increasing ionization energy?

A. Boron, Carbon, Flourine, Nitrogen

B. Boron, Carbon, Nitrogen, Flourine

C. Carbon, Boron, Nitrogen, Flourine

D. Flourine, Nitro9en, Carbon, Boron

E. Nitrogen, Flourine, Carbon, Boron

The gas in air used by plants for photosynthesis is

A. Argon

B. Carbon (IV) oxide

C. Nitrogen

D. Oxygen

E. Water vapour.

When sodium hydroxide solution is added to a solution of zinc salt, the white precipitate formed re-dissolve in excess sodium hydroxide because

A. sodium hydroxide is a strong alkali

B. sodium is more reactive than zinc

C. zinc is more reactive than sodium

D. zinc hydroxide is amphoteric

E. zinc hydroxide is unstable

A chemical system is at equilibrium when

A. δ G is positive

B. δ G is zero

C. δ S is negative

D. δ S is positive

E. δ S is zero.

Brownian motion explains

A. Boyle’s law

B. Collision theory

C. Laws of chemical combination

D. Molecular motion in liquids and gases

E. Vibrational motion in liquids.