MC – Chapter 1 & 2

The element having ……….. favours the formation of an anion.

• a high electron affinity

• high electron affinity and electronegativity

• electronegativity

The electrons located in the outer shell of an atom are known as ………. of the atom.

• the sea of mobile electrons

• valence electrons

• valency

Nitrogen oxide, NO is a ……… covalent molecule.

• non-polar

• polar

• triatomic

In a diamond, each carbon atom is joined to ……… other carbon atoms forming a giant covalent structure.

• five

• four

• three

In the HCl molecule, there are ………. unshared pair electrons on the Cl atom.

• four

• six

• three

The enthalpy change of is the heat change that occours when one mole of a substance is dissolved in water.

• formation

• neutralization

• solution

The bond breaking is a/an ……… process.

• endothermic

• exothermic

• heat evolving

Standard enthalpy change is measured at …….. and 760 mmHg.

• 0°C

• 25°C

• 273 K

Combustion of fuels is a/an ……… process.

• endothermic

• exothermic

• heat absorbing

When the energy needed to break bonds is ……..the energy needed to form bonds, the reaction is exothermic.

• equal to

• greater than

• less than