Equilibrium + Inorganic

The units of K_c for equilibrium reaction are mol^-1 dm³.

Which could not be the equation for the equilibrium?

• A(aq) + B(aq) ⇌ C(s) + 2D(aq)

• P(aq) + Q(aq) ⇌ R(aq)

• W(aq) + 2X(aq) ⇌ Y(aq) + Z(aq)

• K(g) + L(g) ⇌ M(g)

Ethene can be oxidised to form epoxyethane, C₂H₄O.

2C₂H₄(g) + O₂(g) ⇌ 2C₂H₄O(g) ∆H^o = –107 kJ mol^–1

By minimising cost, which set of conditions gives the highest yield of epoxyethane at equilibrium?

• High pressure, 100^oC

• High pressure, 200^oC

• High pressure, 100^oC, catalyst

• Low pressure, 100^oC, catalyst

• High pressure, 200^oC, catalyst

With which compound does concentrated sulfuric acid react both as strong acid and as an oxidising agent?

• potassium carbonate

• potassium chloride

• potassium bromide

• potassium oxide

Solid ammonium nitrate is reacted with solution X to give off a gas. The gas turns red litmus paper blue. What could be the identity of X and its role in the reaction?

• NaOH, proton donor

• NaOH, proton acceptor

• HCl, proton donor

• HCl, proton acceptor

Which could be the best indicator of the reaction sodium hydroxide and ethanoic acid?

• phenolphthalein pH 8.3-10.0

• methyl orange pH 3.1-4.4

• bromothymol 6.0 - 7.4

• alizarin yellow 10.1-13.0

The compound was a white solid.
It dissolved easily in water to give a solution of pH 12.

Which could be the compound?

• none of these.

• Magnesium hydroxide.

• Aluminium oxide.

• Sodium chloride.

The appearance of steamy fumes is the only observation when silicon chloride is added to a beaker of water?

• TRUE

• FALSE

An anhydrous white salt, Z is heated strongly in a boiling tube for 30 minutes. A mixture of gases is given off.

The residue in the boiling tube is then dissolved in a small volume of dilute hydrochloric acid.

The addition of few drops of dilute sulfuric acid to the test-tube causes a white precipitate to form.

Which could be Z?

• barium carbonate

• barium nitrate

• magnesium carbonate

• magnesium nitrate

Which of the following factors can explain the higher reactivity of chlorine than bromine?

• Oxidising ability

• Bond strength

• Id-id strength

• Ionisation energy

Reaction of nitric acid and ammonia would form _____solution.

• Acidic

• Basic

• Neutral