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 following are s-block elements except
lithium
magnesium
potassium
calcium
aluminium
Correct answer is E
No explanation has been provided for this answer.
-46KJ mol -1
-184KJmol -1
-92KJmol -1
184KJmol -1
+46KJmol -1
Correct answer is A
In the reaction the enthalpy of formation 2 mole of NH3 is - 92kJ. Therefore the standard \(\Delta H\) of formation = \(\frac{-92kJ}{2} = -46KJmol^{-1}\).
plastic sulphur
amorphous sulphur
rhombic sulphur
monoclinc sulphur
colloidal sulphur
Correct answer is C
rhombic Sulphur is prepared by allowing a saturated solution of Sulphur in carbon (iv) sulphide to evaporate slowly and crystals will gradually be deposited.
1/2 x 6.02 x 10 23
1 x 6.02 x10 23
2 x 6.02 x 10 23
3x 6.02 x 10 23
4x 6.02 x 10 23
Correct answer is B
No explanation has been provided for this answer.
Which of the following is used extensively in manufacturing photographic chemicals?
Aluminium chloride
Zinc chloride
Silver chloride
Mercury (ll) chloride
lron (ll) chloride
Correct answer is C
No explanation has been provided for this answer.