The following will decolourize acidified potassium tetraoxomanganate (VII) solution except
- A. sulphur (lV) oxide
- B. but-3-ene
- C. pentane
- D. hydrogen sulphide
- E. propyne
Tetraoxosulphate (lV) acid is described as strong acid because it is highly
- A. corrosive
- B. concentrated
- C. reactive
- D. soluble in water
- E. ionized in water
The number of atoms in 1.2g of carbon – 12 isotope is
- A. 1.00 x 10 22
- B. 6.02 x 1022
- C. 1.20 x 10 23
- D. 1.00 x 1023
- E. 6.02 x 1024
The oxidation number of phosphorus in \(PO_4^{3-}\) is
- A. + 1
- B. +2
- C. +3
- D. +4
- E. +5
Which of the following would increase the rate of reaction of chips of a metal M as shown in the equation below? M(s) + 2HCI(aq) → MCI2(aq) + H2(g)
- A. Diluting the hydrochloric acid
- B. Adding some distilled water
- C. Decreasing the temperature
- D. Grinding the metal into powder
- E. Increasing the pressure
Which of the following is not a property of magnesium oxide?
- A. High melting point
- B. Dissolution in polar solvents
- C. Presence of ionic bonds
- D. Possession of crystal lattice
- E. Low binding energy
In any chemical reaction, the total mass of the products is always equal to that of the reactants. This is statement of the law of
- A. definite proportion
- B. conservation of matter
- C. multiple proportions
- D. reciprocal proportions
- E. constant composition
A measure of the degree of disorder in a chemical system is known as the
- A. enthalpy
- B. free energy
- C. activation energy
- D. entrophy
- E. equilibrium
Catalytic hydrogenation of alkenes produces compounds with the general formula
- A. CnH2n+1 OH
- B. CnH2n+1
- C. CnH2n+2
- D. CnH2n-2
- E. Cx(H2O)y
The number of replaceable hydrogen atoms in one acid indicates its
- A. basicity
- B. acidity
- C. alkalinity
- D. reactivity
- E. pH value
The components of universal indicator solution can best be separated by
- A. chromatography
- B. filtration
- C. evaporation
- D. crystallization
- E. fractional distillation