50cm of carbon (II) oxide exploded with 150cm³ of air containing 20% oxygen by volume. Which of the reactants was in excess?

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

Metals which react with steam only when they are red-hot include

• A. copper
• B. sodium
• C. calcium
• D. iron

Which of the following metallic oxides is amphoteric?

• A. AI₂O₃
• B. Fe₂O₃
• C. MgO
• D. Na₂O

The mass of 800cm³ of gas Q at s.t.p. is 1.0g. What is the molar mass of Q? [Avogadros constant = 22.4dm³ mol^-1`]

• A. 18.0 gmol^-1
• B. 22,4gmol^-1
• C. 28.0gmol^-1
• D. 36.0 gmol^-1

The difference between colloides and and suspensions is brought out clearly by the fact that while colloids?

• A. do not scatter light, suspensions do
• B. can be separated by filtration, suspension cannot be so separated
• C. can be separated by a membrane, suspensions cannot
• D. do not settle out on standing, suspensions do

Glucose reduces Fehling solution on warming to

• A. copper (l) oxide
• B. copper (ll) oxide
• C. copper (l) chloride
• D. copper (ll) hydroxide

The only metal that is anti-bacterial is?

• A. Iron
• B. Sodium
• C. Alluminium
• D. Copper

The most suitable method for preparing lead (ll) chloride is by

• A. action of dilute HCI on PbSO₄
• B. acts of dilute HCI on lead
• C. action of dilute HCI on PbCO₃
• D. mixing aqueous solutions Pb(NO₃)₂ and NaCI.

Which of these reagents can confirm the presence of a triple bond?

• A) Hypochlorous acid
• B) Bromine water
• C) Acidified KMnO₄
• D) Copper I chloride

When an equilibrium is established between dissolved and undissolved solutes, the solution is said to be?

• A. Saturated
• B. Unsaturated
• C. Concentrated
• D. Diluted