Myschool CBT challenge season 8 - Over N500,000 worth of prizes

Chemistry Past Questions

Change Subject Ask Question Check Syllabus Download App My Bookmarks

46
Which of the following gases will diffuse fastest when passed through a porous plug?
[H = 1, C = 12, N = 14, O = 16]
  • A. Propane
  • B. Oxygen
  • C. Methane
  • D. Ammonia
View Answer & Discuss (15) JAMB 1999
47
Which is the temperature of a given mass of a gas initially at 0°C and 9 atm, if the pressure is reduced to 3 atm at constant volume?
  • A. 91K
  • B. 182K
  • C. 273K
  • D. 819K
View Answer & Discuss (14) JAMB 1999
48
Which of the following will have its mass increased when heated in air?
  • A. Helium
  • B. Magnesium
  • C. Copper pyrites
  • D. Glass
View Answer & Discuss (11) JAMB 1999
49

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
From the equation above, the mass of magnesium required to react with 250cm3 of 0.5M HCl is
[Mg = 24]

  • A. 0.3g
  • B. 1.5g
  • C. 2.4g
  • D. 3.0g
View Answer & Discuss (30) JAMB 1999
50
A gaseous metallic chloride MClx consists of 20.22% of M by mass. The formula of the chloride is
[M = 27, Cl = 35.5]
  • A. MCl
  • B. MCl2
  • C. MCl3
  • D. M2Cl6
View Answer & Discuss (7) JAMB 1999