by Sunday | Dec 27 | Chemistry WAEC
A. Carbon(II) oxide B. Nitrogen(IV) oxide C. Lead(II) oxide D. Calcium oxide Correct Answer: Option C – Lead (II) oxide Explanation Aluminium oxide is an amphoteric oxide. With sodium hydroxide solution, it produces water and sodium aluminate (NaAlO2). The other...
by Sunday | Dec 27 | Chemistry WAEC
Consider the following table Substitute Melting point / ºC Boiling point / ºC P – 78 -25 Q – 8 40 R – 6 150 S 44 280 A. P B. Q C. R D. S Correct Answer: Option B = Q Explanation Q has slightly lower boiling point which when expose to air may...
by Sunday | Dec 27 | Chemistry WAEC
A. remains constant down the group B. increases across the period C. decreases across the period D. decreases down the group Correct Answer: Option C – decreases across the period Explanation Electropositivity is known to increase down groups and decrease across...
by Sunday | Dec 27 | Chemistry WAEC
A. readily accept electrons B. are soft C. are held together by covalent bond D. are held together by a sea of electron cloud Correct Answer: Option D – are held together by a sea of electron cloud Explanation Metals are effectively lots of positively charged...
by Sunday | Dec 27 | Chemistry WAEC
1s22s22p63s23p63d104s24p4 A. period 4, p- block B. period 3, p- block C. period 4, d- block D. period 3, d- block Correct Answer: Option A – period 4, p- block Explanation Selenium is a chemical element with the symbol Se and atomic number 34. It is a...
by Sunday | Dec 27 | Chemistry WAEC
I. is a white powder II. reacts with HCl. III. reacts with NaOH IV. is insoluble in water A. alkaline B. amphoteric C. acidic D. neutral Correct Answer: Option B – amphoteric Explanation An amphoteric oxide is an oxide that can act as either an acid or base in a...
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