by Sunday | Mar 18 | Chemistry WAEC
A. Gaining of electrons B. Hybridization of orbitals C. Losing electrons D. Sharing electron Correct Answer: Option B – Hybridization of orbitals Explanation – An atom may give, take, or share electrons with another atom to achieve a full valence shell,...
by Sunday | Mar 18 | Chemistry WAEC
A. has a totally filled valence shell B. has a high charge to mass ratio C. does not contain neutrons D. exhibits isotopy Correct Answer: Option C – does not contain neutrons Explanation – The mass number of an atom is its total number of protons and...
by Sunday | Mar 18 | Chemistry WAEC
How many electrons does 3115P3− contain? A. 12 B. 15 C. 16 D. 18 Correct Answer: Option D = 18 Explanation – Phosphorus also has 15 electrons. – Here we have P3− which means that this atom has gained 3 electrons. So, P3− has 18...
by Sunday | Mar 18 | Chemistry WAEC
Consider the reaction represented by the following equation: AgNO3 + NaCl → AgCl + NaNO3 A. heating to saturation and drying B. filtering and evaporation to dryness C. filtering, washing and drying D. crystallizing and allowing to cool Correct Answer: Option C –...
by Sunday | Mar 18 | Chemistry WAEC
A. larger atomic size. B. smaller atomic size C. greater number of valence electrons D. lower melting point Correct Answer: Option B – smaller atomic size Explanation – Magnessium has a stronger metallic bond than calcium because it has smaller atomic...
by Sunday | Mar 18 | Chemistry WAEC
A. Na, Mg, Al, Si, P B. Na, A1, Mg, P, Si C. P, Mg, Na, Si, Al D. P, Si, Al, Mg, Na Correct Answer: Option D = P, Si, Al, Mg, Na Explanation – Reactivity series is K > Na > Ca > Mg > Al > Zn > Fe > Pb > H > Cu > Hg > Ag > Au....
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