by Sunday | Dec 27 | Chemistry WAEC
A. acidified K2Cr2O7 solution colourless B. acidified KMnO4 solution colourless C. Fe(NO3)2 solution green D. Pb(NO3)2 paper black Correct Answer: Option B – acidified KMnO4 solution colourless Explanation If the potassium manganate(VII) solution is acidified...
by Sunday | Dec 27 | Chemistry WAEC
CH3CHCH3CHClCHCH3CH2CH3 A. 2, 4 – dimethyl – 3 – chlorohexane B. 3, 5 – dimethyl – 4 – chlorohexane C. 4 – chloro – 3, 5 – dirnethylhexane D. 3 – chloro – 2, 4 – dimethylhexane Correct...
by Sunday | Dec 27 | Chemistry WAEC
A. a weak acid B. a reducing agent. C. an oxidizing agent D. a strong acid. Correct Answer: Option C – an oxidizing agent Explanation HOCl is unstable and decomposes to release oxygen which oxidizes the dye to form a colourless...
by Sunday | Dec 27 | Chemistry WAEC
A. 12C B. 120C C. 360C D. 720C Correct Answer: Option D – 720C Explanation Q =It t = 60 * 60=3600 I = 0.20 Q=0.20 * 3600 Q= 720C
by Sunday | Dec 27 | Chemistry WAEC
A. chlorine and sodium. B. oxygen and hydrogen. C. chlorine and hydrogen. D. hydrogen and oxygen. Correct Answer: Option B – oxygen and hydrogen. Explanation Oxygen is produced at the anode and hydrogen is produced at the cathode in dilute...
by Sunday | Dec 27 | Chemistry WAEC
A. MO B. MO2 C. MO3 D. MO4 Correct Answer: Option C = MO3 Explanation Data obtained from the question M = 60 g O = 24 g Empirical formula =? How to determine the empirical formula Divide by their molar mass M = 60÷120 = 0.5 O = 24 ÷16 = 1.5 Divide by the smallest M =...