Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
The periodic property that is used to determine whether a covalent molecule is polar or not is
atomic radius
ionization energy
electron affinity
electronegativity
Correct answer is D
The periodic property that is used to determine whether a covalent molecule is polar or not is electronegativity.
Electronegativity is a measure of the ability of an atom to attract electrons in a chemical bond. The greater the electronegativity of an atom, the more strongly it will attract electrons.
The gas that is less dense than air is
nitrogen
chlorine
Carbon(IV) oxide
Oxygen
Correct answer is A
The density of a gas is directly proportional to its molar mass. This means that gases with a lower molar mass will be less dense than gases with a higher molar mass. Nitrogen (N2) has a molar mass of 28 g/mol, which is less than that of air (approximately 29 g/mol), making it less dense than air.
The primary component of natural gas
ethane
methane
butane
propane
Correct answer is B
Natural gas is a fossil fuel primarily composed of hydrocarbon gases. The primary component of natural gas is methane, which typically makes up a significant portion of the gas mixture. Methane is a simple hydrocarbon with one carbon atom and four hydrogen atoms (CH4). It is the main component of natural gas, often accounting for over 90% of its composition.
Going down group II in the periodic table normally
ionization energy increases
melting point increases
shielding effect decreases
electronegativity increases
Correct answer is B
Melting point increases. This is because the atoms become larger as you go down the group, which means that the metallic bonds between them become stronger.
A consequence of global warming is
air pollution
High Humidity
flooding
Water pollution
Correct answer is C
Flooding is a major consequence of global warming because as the Earth's ice caps and glaciers melt, sea levels rise. This can cause flooding in coastal areas and low-lying islands. For example, in 2019, the Netherlands experienced its worst flooding in decades, with over 10,000 homes damaged and thousands of people evacuated.
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