2H2O (l) + 2F2(g) → 4HF(aq) + O2(g). In the reaction above, the substance that is being reduced is

• A) O2(g)
• B) H2O(l)
• C) F2(g)
• D) HF(aq

The bond formed between two elements with electron configurations 1s2 2s2 2p6 3s2 and 1s2 2s2 2p4 is

• A) metallic
• B) covalent
• C) dative
• D) ionic

In an electrochemical cell, polarization is caused by

• A) chlorine
• B) oxygen
• C) tetaoxsulphate (Vl) acid
• D) hydrogen

10.0 dm3 of water was added to 2.0 mol dm-3 of 2.5dm^3 solution of HCl. What is the concentration of the final solution in mol/dm^3?

• A) 0.4
• B) 8.0
• C) 2.0
• D) 0.5

The compound below is an

• A) alkanone
• B) alkanoate
• C) alkanal
• D) akanol

Calculate the volume in cm3 of oxygen evolved as s.t.p. when a current of 5 A is passed through acidified water for 193s {F = 96500 Cmol-1, Molar volume of a gas at s.t.p. = 22.4 dm3

• A) 224.000 dm³
• B) 0.056 dm³
• C) 0.224 dm³
• D) 56.000 dm³

How many unpaired electron are in the p-orbitals of a fluorine atom?

• A) 3
• B) 0
• C) 1
• D) 2

The solvent used for removing grease stain is

• A) turpentine
• B) ammonia solution
• C) ethanol
• D) solution of borax in water

Which of the following compounds is a neutral oxide?

• A) Carbon (IV) oxide
• B) Sulphur (Vl) oixide
• C) Sulphur (IV) oxide
• D) Carbon (ll) oxide

The constituent of air that acts as a diluent is

• A) nitrogen
• B) carbon (IV) oxide
• C) noble gases
• D) oxygen