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.
What volume of 0.5M H2SO4 will exactly neutralize 20cm3 of 0.1M NaOH Solution?
2.0cm 3
5.0cm 3
6.8cm 3
8.3cm 3
Correct answer is A
The balanced equation is given as:
H2SO4+2NaOH→Na2SO4+2H2O
Molarity of NaOH=0.1M
Volume of NaOH=20cm3
Molarity of H2SO4=0.5M
mol NaOH = 0.1×20cm3=2molNaOH
⇒ 2molNaOH×1molH2SO42molNaOH=1molH2SO4
volumeofH2SO4=moleofH2SO4molarityofH2SO4
= 1mole0.5M=2cm3H2SO4
An example of an acidic oxide is
NO
CO
SO2
CuO
Correct answer is C
No explanation has been provided for this answer.
The metal whose ore can be concentrated by passing it through a magnetic separator is
Zn
Sn
Cu
Ca
Correct answer is B
No explanation has been provided for this answer.
Which of the following statements is correct about the periodic table?
Elements in the same group have the same number of electron shells
The non-metallic properties of the elements tend to decrease across each period
Elements in the same period have the same number of valence electrons
The valence electrons of the elements increase progressively across the period
Correct answer is D
No explanation has been provided for this answer.