The following gases are diatomic EXCEPT
- A. Fluorine
- B. Helium
- C. Hydrogen
- D. Nitrogen
- E. Oxygen
If two elements X and Z with electronic configurations 2,8.3 and2,8,6 respectively combine, the compound formed will have the formula
- A. XZ
- B. XZ2
- C. X2Z
- D. X2Z3
- E. X3Z2
The reaction of hydrochloric acid and calcium trioxocarbonate (IV) produces
- A. calcium chloride, carbon (IV) oxide and water
- B. calcium chloride, and trioxocarbonate (IV) acid
- C. calcium hydroxide, carbon (IV) oxide and chlorine gas
- D. calcium hydroxide, carbon (IV) oxide and water
- E. calcium metal and water.
Brownian motion explains
- A. Boyleβs law
- B. Collision theory
- C. Laws of chemical combination
- D. Molecular motion in liquids and gases
- E. Vibrational motion in liquids.
A chemical system is at equilibrium when
- A. Ξ΄ G is positive
- B. Ξ΄ G is zero
- C. Ξ΄ S is negative
- D. Ξ΄ S is positive
- E. Ξ΄ S is zero.
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
The gas in air used by plants for photosynthesis is
- A. Argon
- B. Carbon (IV) oxide
- C. Nitrogen
- D. Oxygen
- E. Water vapour.
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 following acids are monobasic EXCEPT
- A. dioxonitrate (Ill) acid
- B. ethanedioic acid
- C. hydrobromic acid
- D. methanoic acid
- E. oxochlorate (I) acid
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. Z203
- E. Z3Cl2
Bauxite is the ore of
- A. aluminium
- B. calcium
- C. Iron
- D. sodium
- E. magnesium
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.
pH is define as
- A. [H+]
- B. βlog [H]
- C. βlog [H+]
- D. log [H]
- E. log [H+]
Which of the following compounds is unsaturated?
- A. Cyclohexane
- B. Methoxyethane
- C. 1 ,2-dibromoethane
- D. 2,2,3-trimethylpentane
- E. 3-methylbut-l-ene
A solution is prepared by dissolving I .96g of H2SO4 in 250 cm3 of its solution. What is the concentration in moles per dm3?
- A. 0.008
- B. 0.08
- C. 0.1
- D. 0.8
- E. 8.02
The action of zinc on an acid produces
- A. chlorine
- B. hydrogen
- C. nitrogen
- D. sulphur
- E. water vapour.
The high boiling point of hydrogen fluoride can be explained in terms of?
- A. covalent bonds.
- B. dative bonds.
- C. dipole-dipole bonds
- D. electrovalent (ionic) bonds.
- E. hydrogen bonds.
What type of bond holds hydrogen fluoride molecules together when forming larger aggregate?
- A. Covalent
- B. Dative
- C. Hydrogen
- D. Ionic
- E. Metallic
A device used in the laboratory for intermittent production of gases without heating is
- A. aspirator
- B. delivery tube
- C. fume cupboard
- D. kippβs apparatus
- E. muller counter
If two metallic ions of the same concentration migrate to a graphite cathode, the one that would be preferentially discharged is that with the
- A. greater stability in solution
- B. lower electrical charge
- C. smaller mass
- D. stronger tendency to accept electrons
- E. stronger tendency to lose electrons.
The planet with the highest number of moon is
- A. Earth
- B. Jupiter
- C. Uranus
- D. Pluto
- E. Venus.