Structure, bonding and properties

Question 1 of 7

Sodium chloride has a high melting point because

A. strong electrostatic forces hold the giant ionic lattice B. it has weak van der Waals forces C. it is covalent D. it has delocalised electrons

Question 2 of 7

Diamond is very hard because

A. it is made of ions B. it has free electrons C. each carbon atom is covalently bonded to four others in a giant structure D. its molecules are small

Question 3 of 7

Different forms of the same element in the same physical state are

A. allotropes B. isotopes C. isomers D. homologues

Question 4 of 7

Metals conduct electricity because they have

A. delocalised electrons B. ions that move in the solid C. no electrons D. covalent bonds

Question 5 of 7

Graphite conducts electricity because it has

A. no bonds B. ions that move C. hydrogen bonds D. delocalised electrons between its layers

Question 6 of 7

Simple molecular substances such as CO₂ have

A. low melting and boiling points B. very high melting points C. metallic lustre D. ionic bonds

Question 7 of 7

Ionic compounds conduct electricity when

A. solid B. molten or dissolved in water C. cold D. powdered

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Questions written by OtisamLMS in the style of the WASSCE. They are not WAEC past questions.

Past questions, worked solutions and curriculum-mapped study material for JHS and SHS students and teachers in Ghana.

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