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306

Alloys are best prepared by

  • A. Electroplating
  • B. Arc-welding
  • C. Reducing and mixture of their metallic oxide
  • D. Cooling a molten mixture of the metals
View Answer & Discuss (2) JAMB 2004
307

Transition metals possess variable oxidation states because they have

  • A. Electrons in the d orbitals
  • B. Electron in the s orbitals
  • C. A variable number of electrons in the p orbitals
  • D. Partially filled p orbitals
View Answer & Discuss (1) JAMB 2004
308

Sodium metal is always kept under oil because it

  • A. Readily reacts with water
  • B. Is reduced by atmospheric nitrogen
  • C. Reacts vigorously on exposure to air
  • D. Reacts with oxygen and carbon (IV) oxide
View Answer & Discuss (17) JAMB 2004
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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309

Oxyacetylene flame is used for iron-welding because it

  • A. Makes the iron metals solidify very quickly
  • B. Combines with oxygen to give a pop sound
  • C. Evolves a lot of heat when burnt
  • D. Dissociates to produce carbon (IV) oxide and oxygen
View Answer & Discuss (3) JAMB 2004
310

The alkyl group can be represented by the general formula

  • A. CnH2n+1
  • B. CnH2n
  • C. CnH2n+2
  • D. CnH2n-2
View Answer & Discuss (12) JAMB 2004
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts