Chemistry Quiz 6

Which of the following substances is made up of ions?

• water

• argon

• oxygen gas

• sodium chloride

The following equation represents a reaction.

Na2S2O3 + H2SO4 ---> Na2SO4 + H2O + S + SO2

What are the reactants in this reaction?

• sodium sulphate, water, sulphur and sulphur dioxide

• sodium sulphate and sulphuric acid

• sodium thiosulphate and sulphuric acid

• sodium thiosulphate and sodium sulphate

How a dative bond can be formed?

• lone pair of electrons from a non-metal atom are shared with another atom

• lone pair of electrons are donated to other atom to form electrostatic force

• lone pair of electrons are donated to ensure only 6 electrons in the outermost shell

A student added 2cm^3 of 0.1 moldm-3 nitric acid into a test tube containing 2cm^3 of 0.1moldm^-3 potassium hydroxide solution. Identify the salt produced and its solubility.

• KNO2, insoluble

• KNO3, insoluble

• KNO2, soluble

• KNO3, soluble

Diagram shows a physical properties of salt Y. What is salt Y?

• lead(II) iodide

• lead(II) chloride

• barium chromate(VI)

• potassium iodide

Alloy Z has the following composition:

74% iron, 18% chromium, 8% nickel

What is alloy Z?

• stainless steel

• duralumin

• brass

• pewter

What is a standard electrode potential?

• the potential difference produced when an equilibrium is established between metal and its ions aqueous solution in a half-cell.

• the potential difference produce when an equilibrium is established between two aqueous solutions in a half-cell

• the potential difference as oxidation occurs at the electrode

• the potential difference as reduction occurs at the electrode

Which of the following involves a reduction?

• aluminium atom gains oxygen

• barium atom loses electron

• hydrogen sulphide loses hydrogen

• chlorine atom gains electron

The equation represents an addition reaction of alkene. What is the catalyst used in the reaction?

• iron

• nickel

• copper(II) sulphate

• manganese (IV) oxide

Which of the following pair of compounds are classified in the same homologous series?

• A

• B

• C

• D