pH is define as
- A. [H+]
- B. –log [H]
- C. –log [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. kipp’s 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.
Pipe-borne water is usually chlorinated in order to
- A. coagulate sediments in the water
- B. improve taste of the water
- C. kill harmful bacteria in the water
- D. make it pure
- E. remove the hardness in the water
The rate of a chemical reaction is NOT affected by one of these factors
- A. colour
- B. concentration
- C. presence of light
- D. surface area
- E. temperature
The molecular formula of ethylbutanoate is?
- A. CH5COOC26
- B. C3HCOOC2H7
- C. C3H7COOC3H7
- D. C3H7COOC4H9
- E. C3H7COOC2H5
Which of the following is a component of the car exhaust?
- A. Aluminium
- B. Calcium
- C. Iron
- D. Zinc
- E. Lead
Which of the following will Increase the rate of reaction of Chips of a metal M as shown in the equation below?
M(s)+2HC1(aq) → MCI2 (aq) + H2(g)
- A. Adding some distilled water
- B. Decreasing the temperature
- C. Diluting the hydrochloric acid
- D. Grinding the metal into powder
- E. Increasing the pressure
What is the colour of phenolphthalein indicator in a basic medium?
- A. Blue
- B. Colourless
- C. Orange
- D. Pink
- E. Yellow
\( ^{234}_{90}Th → ^{234}_{91}Pa + X \)
In the nuclear reaction above, X is
- A. \( ^0_1e \)
- B. \( ^0_{-1}e \)
- C. \( ^4_2He \)
- D. \( ^1_0n \)
- E. \( ^1_1p\)
When dust particles collide randomly in a beam of Sunlight, the phenomenon observed is known as
- A. Brownian movement.
- B. Dialysis
- C. Diffusion
- D. Osmosis
- E. Tyndall effect
The most efficient absorber of ultraviolet radiation in the atmosphere is
- A. CO2
- B. H2
- C. H2O
- D. 02
- E. O3
Chlorine atom forms Cl- by
- A. donating lone pair of electrons
- B. gaining an electron
- C. losing an electron
- D. sharing an electron
- E. sharing a lone pair of electrons.
Which of the following laws is obeyed If at constant temperature, 200cm of hydrogen at 1.5 × 10m5Nm-2pressure becomes 300cm3 at 1.0 × 105Nm-2 pressure?
- A. Avogadro’s
- B. Boyle’s
- C. Charles’
- D. Faraday’s
- E. Graham’s
The type of reaction ethyne mainly undergoes is
- A. addition
- B. carboxylation.
- C. esterification
- D. saponification
- E. substitution