Beginning with the least reactive, the order of reactivity of the following metals with dilute hydrochloric acid is
iron, aluminium lead, zinc
zinc, lead, aluminium, iron
lead, iron, zinc, aluminium
aluminium, zinc, iron, lead
Which one of the following substances conducts electricity?
Zinc
Neon
Chlorine
Sulphur
Which one of the following gases is an oxidizing agent?
Hydrogen
Water vapour
Argon
Oxygen
A separating funnel can be used to separate a mixture of water and petrol because the two liquids.
are miscible
are immiscible.
have different densities.
have different boiling points.
The process by which water is changed into steam is called
distillation
efflorescence
condensation
evaporation
Which of the following mixtures is best separated by chromatography?
Ink
Crude petroleum
Water and oil
Water and ethanol
The gas produced when steam is passed over heated iron filings is
O2
N2O
H2
NO
Rust is hydrated
iron (II) oxide
iron (II) oxide
iron (III) oxide
iron (III) hydroxide
Brass is an alloy of
tin and copper
lead and copper
zinc and copper
aluminium and copper
Which one of the following mixtures is best separated by using a separating funnel?
Oil and water
Sugar and water
Ethanol and water
Sand and water
Which one of the following substances can be purified by sublimation?
Sulphur
Phosphorous
potassium Chloride
Ammonium Chloride
The main components of air are
oxygen and nitrogen
oxygen and hydrogen
nitrogen and carbon dioxide.
nitrogen and noble gases
Which one of the following substances undergoes a chemical reaction when heated?
Ice
Argon
Iodine
Sulphur
An oxide of metal Z reacts with magnesium when heated but it does not react with copper. The order of reactivity of Z, magnesium and copper starting with the most reactive is
Cu, Z, Mg
Z, Mg, Cu
Mg, Cu, Z.
Mg, Z, Cu
Which one of the following substances sublimes when heated?
ZnO
CaCI2
I2
P
The red brown coating formed when iron nail is left in moist air for a long time is
hydrated iron (II) oxide
hydrated iron (III) oxide
anhydrous iron (II) oxide
anhydrous iron (III) oxide
Which one of the following methods is normally used to prepare hydrogen in the laboratory?
Electrolysis of water.
Action of water on magnesium
Action of dilute hydrochloric acid on zinc.
Action of steam on zinc.
The alloy solder consists of
zinc and lead
copper and lead
copper and aluminium
tin and lead.
Which one of the following metals will not displace lead from its salt in solution?