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2916
A substance is said to be hygroscopic when it
  • A. absorbs atmospheric moisture and then goes into solution
  • B. absorbs atmospheric moisture but does not go into solution
  • C. changes colour
  • D. is not affected by atmospheric moisture
  • E. losses its water of crystallization
View Answer & Discuss (1) NECO 2008
2917

A measure of the degree of disorderliness in a chemical system is known as the

  • A. activation energy
  • B. enthalpy
  • C. entropy
  • D. equilibrium
  • E. free energy.
View Answer & Discuss (2) NECO 2008
2918
What is the maximum number of electrons that an f-orbital can accommodate?
  • A. 2
  • B. 6
  • C. 7
  • D. 10
  • E. 14
View Answer & Discuss (4) NECO 2008
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2919
In which of these groups will all the substances be insoluble in water?
  • A. Na2CO3, KNO3,(NH4)2C03
  • B. NaHCO3, PbSO4, CaSO4
  • C. K2C03, CaSO4, AgNO3
  • D. PbCl2, NaCl, ZnCl2
  • E. ZnCO3, BaSO4,AgCl
View Answer & Discuss NECO 2008
2920

In which of the following equations can Le-chartelier’s principle be applied?

  • A. H2(g)+S(g) → H2(g)
  • B. 2H2S(g) + O2 (g) → 2H2O(l) + 2SO2(g)
  • C. N2(g) +3H2(g) ⇌ 2NH3(g)
  • D. NaOH(aq) +CO2(g) → Na2CO3(aq) + H2O(l)
  • E. S(s) + 02(g) → SO2(g)
View Answer & Discuss (3) NECO 2008
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