What quantity of electrons (in mole) is lost when one mole of iron (ll) ions is oxidized to iron (lll) ions?
- A. 5 mole
- B. 4 mole
- C. 3 mole
- D. 2 mole
- E. 1 mole
Which of the following ions will migrate to the cathode during electrolysis?
- A. Zinc ions
- B. Chloride ions
- C. Sulphide ions
- D. Tetraoxosulphate (Vl) ions
- E. Trioxonitrate (V) ions
The loss of molecules of water of crystallization to the atmosphere by some crystalline salts is known as
- A. efflorescence
- B. effervescence
- C. phosphorescence
- D. fluorescence
- E. deliquescence
Which of the following is a general method of preparing acids?
- A. Direct combination of constituent elements
- B. Reaction between a base and an amphoteric oxide
- C. Double decomposition involving a salt solution
- D. Reaction between an anhydride and water
- E. Dissolution of hydroxides followed by neutralization
Which of the following is a general method of preparing acids?
- A. Direct combination of constituent elements
- B. Double decomposition involving a salt solution
- C. Reaction between an anhydride and water
- D. Reaction between a base and an amphoteric oxide
- E. Dissolution of hydroxides followed by neutralization
An acid is a substance which in the presence of water produces
- A. salts
- B. oxygen
- C. effervescence
- D. hydroxonium ions
- E. hydrogen gas
A given volume of methane diffuses in 20 seconds. How long will it take the same volume of sulphur (IV) oxide to diffuse under the same conditions? [CH4 = 16; SO2 = 64]
- A. 5 seconds
- B. 20 seconds
- C. 40 seconds
- D. 60 seconds
- E. 80 seconds
An increase in the pressure of a gas results in a decrease in its
- A. mass
- B. vapour density
- C. volume
- D. temperature
- E. concentration
If the atomic number of an element X is 11 and that of nitrogen is 7, the most likely formula of the nitride of X is
- A. X3N
- B. XN3
- C. X3N2
- D. N2X
- E. NX2
A sodium atom and a sodium ion have the same
- A. number of neutrons
- B. number of electrons
- C. electric charge
- D. electronic structure
- E. chemical properties
In linear molecules, the bond angle is
- A. 90o
- B. 140o
- C. 109o
- D. 120o
- E. 180o
What is the most probable group of an element which is a soft, silvery white solid and reacts violently with water?
- A. Group 0
- B. Group 1
- C. Group 4
- D. Group 6
- E. Group 7
Radon is used as a tracer in medical research because it
- A. is monatomic
- B. is radioactive
- C. is a noble gas
- D. has a complete valence shell
- E. has a low boiling point
How many unpaired electrons are there in an atom of an element with the following electronic configuration? 1s22s22p6
- A. o
- B. 1
- C. 2
- D. 6
- E. 8
The mass number of an element is the sum of its
- A. electrons, neutrons and protons
- B. electrons and protons
- C. protons and neutrons
- D. orbital electrons
- E. valence electrons
The phenomenon observed when dust particles collide randomly in a beam of sunlight is known as?
- A. Tyndal effect
- B. diffusion
- C. osmosis
- D. brownian movement
- E. dialysis
The following salts will produce a gas on reacting with hydrochloric acid except
- A. CuSO4
- B. CaCO3
- C. FeS
- D. Na2SO3
- E. K2CO3
The following are properties of transition metals except
- A. variable oxidation states
- B. tendency to form complext ions
- C. formation of coloured ions
- D. ability to act as catalyst
- E. low melting points
The products formed when sodium hydrogen trioxocarbonate (IV) is heated strongly are
- A. carbon (IV) oxide and sodium hydride
- B. carbon (IV) oxide and soudium trioxocarbonate (IV)
- C. sodium trioxocarbonate (IV) and steam
- D. carbon (IV) oxide and steam
- E. sodium trioxocarbonate (IV) carbon (IV) oxide and steam
What amount of copper is deposited when 13.0g of zinc reacts with excess copper (ll) tetraoxosulphate (IV) solution according to the following equation? Zn (s) + CuSO4(aq) → ZnSO4(aq) + Cu (s) [Cu =63,5, Zn = 65]
- A. 0.1 mole
- B. 0.2mole
- C. 0.3 mole
- D. 0.4 mole
- E. 0.5 mole
Which of the following metals will be the most suitable for use where lightness and resistance to corrosion are of importance?
- A. Lead
- B. Copper
- C. Iron
- D. Calcium
- E. Aluminium