The correct order of increasing oxidation number of the transition metal ions for the compounds K2Cr2O7, V2O5 and KMnO4 is
A. V2O5 < K2Cr2O7 < KMnO4
B. K2Cr2O7 < KMnO4 < V2O5
C. KMnO4 < K2Cr2O7 < V2O5
D. KMnO4 < V2O5 < K2Cr2O7

0.25 mole of hydrogen chloride was dissolved in distilled water and the volume made up of 0.50 dm3. If 15.0 cm3 of the solution requires 12.50 cm3 of aqueous sodium trioxocarbonate (IV) for neutralization, calculate the concentration of the alkaline solution
A. 0.30 mol dm3
B. 0.40 mol dm3
C. 0.50 mol dm3
D. 0.60 mol dm3

Given that electronegativity increases across a period and decreases down a group in the periodic table, in which of the following compounds will the molecules be held together by the strongest hydrogen bond?
A. HF(g)
B. NH3(g)
C. CH4(g)
D. HCl(g)

55
1s2, 2s2, 2p6, 3s2, 3p6, 3d7, 4s2
An element with the electronic configuration above is a
A. non-metal
B. metal
C. transition element
D. group two element

The method that can be used to convert hard water to soft water is
A. chlorination
B. passage over activated charcoal
C. the use of an ion-exchange resin
D. aeration

The method that can be used to convert hard water to soft water is
A. chlorination
B. passage over activated charcoal
C. the use of an ion-exchange resin
D. aeration

Nitrogen obtained from the liquefaction of air has a higher density than that obtained from nitrogen containing compounds because the former contains

A. water vapour
B. oxygen
C. carbon (IV) oxide
D. rare gases

In order to remove one electron from a 3S orbital of gaseous sodium atom, about 496KJMol-1 of energy is required. This energy is referred to as
A. electron affinity
B. ionization energy
C. activation evergy
D. electronegativity

In which of the following are water molecules in the most disorderly arrangement?

A. Ice at -10°C
B. Ice at 0°C
C. Water at 100°C
D. Steam at 100°C

A gaseous metallic chloride MClx consists of 20.22% of M by mass. The formula of the chloride is?
[M = 27, Cl = 35.5]

A. MCl
B. MCl2
C. MCl3
D. M2Cl6