Chemistry Quiz PU1C

What property of elements mainly determines their variation in melting point and electrical conductivity based on structure and bonding?

• Atomic radius

• Ionization energy

• Electron affinity

• Bond type and arrangement

An unknown element has a low melting point, forms acidic oxides, and exhibits poor electrical conductivity. Where is this element likely positioned in the periodic table?

• Group 1 (Alkali Metals)

• Group 14 (Carbon family)

• Group 17 (Halogens)

• Group 18 (Noble Gases)

An unknown element exhibits a high melting point, conducts electricity in its molten state, and forms a basic oxide. What is the likely nature of this element?

• Non metal

• Metal

• Metalloid

• Noble Gas

What causes the variation in the oxidation number of oxides and chlorine in chemical compounds, based on their outer shell electrons?

• Variation in atomic mass

• Changes in electron configuration

• Differentiation in atomic radius

• Changes in ionization energy

Why does N₂ require a large amount of energy to break?

• It is diatomic

• It is a non-metal

• It contains a covalent bond

• Triple bond strength

This is the structure of an ammonium ion.

• True

• False

The unburnt hydrocarbons are formed when complete combustion occurs.

• True

• False

What happens to the reactivity of Group 2 metals as you move down the group?

• Reactivity remains constant down the group

• Reactivity decreases down the group

• Reactivity increases down the group

• Reactivity fluctuates unpredictably down the group

Which Group 2 metal does not follow the trend of increasing melting point down the group?

• Magnesium

• Calcium

• Barium

• Beryllium

What change is observed in the basicity of Group 2 oxides as you move down the group?

• Basicity remains constant down the group

• Basicity decreases down the group

• Basicity increases down the group

• Basicity fluctuates unpredictably down the group