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.
All the compounds are gaseous at 20 °C
One of the compounds is gaseous at 20 °C
Two of the compounds are gaseous at 20 °C
Three of the compounds are gaseous at 20 °C
None of the compounds is gaseous at 20 °C
Correct answer is D
No explanation has been provided for this answer.
48,000
96,000
192,000
384,000
576,000
Correct answer is D
48,000 coulombs are required to discharge 0.5 mole of Na
∴ 1 m will be discharged by 2 x 48,000 = 96,000 coulombs
2 moles of Na will be discharged by 2 x 96,000
= 192,000
For lead (Pb) two electrons are involved.
∴ Number or coulombs required to discharged 2 moles of Pb = 2 x 192,000 = 384,000 coulombs
28.8 cm3 of nitrogen at 15°C is cooled to O°C at constant pressure, the new volume of nitrogen is?
17.4 cm3
14.7 cm3
27.3 cm3
31.7 cm3
Correct answer is C
(V1)/(T1) = (V2)/(T2) (288 cm3)/(288) = (V2)/(273)
V2 = (288 x 273)/(288) = 273 cm3
Which of the following statements about phosphorus is NOT correct?
Phosphorus is a solid mineral
Phosphorus is obtained by oxidation reaction of phosphate
Phosphorus exists in two allotropic forms
Both forms of phosphorus are interconvertible
Yellow phosporus ignites when rubbed on a rough surface
Correct answer is C
The main allotropes of phosphorus include the white phosphorus, red phosphorus and black phosphorus.
addition products of long chain fatty acids and alkali
addition products of long-chain fattyy acids and glycerol
condensation products of long-chain fatty acids and glycerol
condensation products of formaldehyde and glycerol
liquids at 20°C
Correct answer is C
No explanation has been provided for this answer.