MnO\(_4\)(aq) + Y + 5Fe\(^{2+}\) (aq) \(\mapsto\) Mn\(^{2+}\) (aq) + 5Fe\(^{3+}\) (aq) + 4H\(_2\)O (l).
In the equation above, Y is
- A. 10H+ (aq)
- B. 5H+ (aq)
- C. 8H+ (aq)
- D. 4H+ (aq)
A chemical reaction in which the hydration energy is greater than the lattice energy is referred to as
- A. A reversible reaction
- B. A spontenous reaction
- C. An endothermic reaction
- D. An exothermic reaction
The gas that is used for the treatment of cancer is
- A. Neon
- B. Radon
- C. Xenon
- D. Argon
Calculate the volume in cm3 of oxygen evolved at s.t.p when a current of 5A is passed through acidified water for 193s?
[F = 96500 C mol1. Molar volume of a gas at s.t.p = 22.4dm3]
- A. 0.056dm3
- B. 0.224dm3
- C. 224.000dm3
- D. 56.000dm3
An isotope has an atomic number of 15 and a mass number of 31. The number of proton it contains is
- A. 16
- B. 15
- C. 31
- D. 46
An example of a solid emulsion is
- A. Butter
- B. Hair cream
- C. Milk
- D. Cod-liver oil
In a neutralization reaction involving HCI and NaOH using litmus as indicator, the colour at the end point is
- A. Blue
- B. Red
- C. Orange
- D. Purple
In the extraction of iron, the waste gas from the furnace is a mixture of
- A. PH3 CO and CO2
- B. CO and C
- C. N2 , CO and CO2
- D. PH3 and CO
The arrangement of particles in crystal lattices can be studied using
- A. X-rays
- B. \(\beta\)-rays
- C. \(\alpha\)-rays
- D. \(\gamma\)-rays
The drying agent suitable for drying ammonia is
- A. Calcium Chloride
- B. Calcium Oxide
- C. Phosphorus(V) Oxide
- D. Concentrated H2SO4
The number of electronic shells contained in an atom with electron configuration 1s22s22p63s23p64s2 is
- A. 3
- B. 2
- C. 4
- D. 5
Ethanol is soluble in water due to the presence of a
- A. Carbonyl group
- B. Hydroxyl group
- C. Phenyl group
- D. Methyl group
Diamond cannot be used
- A. In making bicycle chains
- B. As abrasives
- C. In cutting glass and metals
- D. As dies for drawing wires
What volume of 0.5M H2SO4 will exactly neutralize 20cm3 of 0.1M NaOH Solution?
- A. 2.0cm 3
- B. 5.0cm 3
- C. 6.8cm 3
- D. 8.3cm 3
The metal whose ore can be concentrated by passing it through a magnetic separator is
- A. Zn
- B. Sn
- C. Cu
- D. Ca
Which of the following statements is correct about the periodic table?
- A. Elements in the same group have the same number of electron shells
- B. The non-metallic properties of the elements tend to decrease across each period
- C. Elements in the same period have the same number of valence electrons
- D. The valence electrons of the elements increase progressively across the period
Which of the following is not an alkali?
- A. Ca(OH)2
- B. NH3
- C. NaOH
- D. Al(OH)3
Alkanols have the general molecular formula
- A. CnH2n-2
- B. CnH2n+1CHO
- C. CnH2n-2OH
- D. CnH2n+1OH
The products formed when primary Alkanols are oxidized using acidified potassium tetraoxomanganate (VII) are what?
- A. CH3CH2CHO and H2O
- B. CH3CHO and CO2
- C. CH3CH2COOH and H2
- D. CH3COOH and CO2
Which of the following compounds is used as a gaseous fuel?
- A. CH3 -CH2 -CHO2 -COOH
- B. CH3 -C = CH
- C. CH3 -CH2 -CH2 -CH3
- D. CH2 -CH2 -CH3