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2966
What volume of carbon (IV) oxide in dm 3 is produced at s.t.p. when 2.50g of CaCO3 reacts with excess acid according to the following equation? CaCO3(s) + 2HCI(aq) → CaCl2(aq) + H2O(1) + CO2(g)

[CaCO2 100; molar volume of a gas at s.t.p. = 22.4dm 3]
  • A. 0.28
  • B. 0.56
  • C. 2.24
  • D. 5.6
  • E. 11.2
View Answer & Discuss NECO 2009
2967
The following equations represent redox reactions EXCEPT
  • A. Ba2+(aq) + SO2-4 (aq) → BaSO4(s)
  • B. Cl2(g) + 2Br- (aq) → 2CI - (aq) + Br2(g)
  • C. Fe2+(aq) + ½ C I2(aq) → Fe3+ (aq) + CI-(aq)
  • D. 2Fe3+(aq) + Sn2+(aq) → 2Fe2+(aq) Sn4+ (aq)
  • E. Zn(s) + CU2+(aq) → Zn2+(aq) + CU(s)
View Answer & Discuss NECO 2009
2968
How many unpaired electron are in the p-orbitals of a fluorine atom?
  • A. 3
  • B. \( 0 \)
  • C. 1
  • D. 2
View Answer & Discuss (4) JAMB 2013
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2969
The radioactive emission with the least ionization power is
  • A. \( \alpha - particles \)
  • B. X-rays
  • C. \( \gamma -rays \)
  • D. \( \beta - rays \)
View Answer & Discuss (6) JAMB 2013
2970
Zn(s) + CuSO4(aq) \( \to \) ZnSO4(aq) + Cu(s)

In the reaction above, the oxidizing agent is
  • A. CuSO4(aq)
  • B. ZnSO4(aq)
  • C. Cu(s)
  • D. Zn(s)
View Answer & Discuss (3) JAMB 2013
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