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Chemistry JAMB Past Questions

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696

A blue solid, T, which weighed 5.0g was placed on a table. After 8 hours, the resulting pink solid was found to weigh 5.5g. It can be inferred that substance T?

  • A. is deliquescent
  • B. is hygroscopic
  • C. has some molecules of water of crystallization
  • D. is efflorescent
View Answer & Discuss (27) JAMB 1990
697
The solubility in moles per dm3 of 20g of CuSO4 dissolve in 100 of water at 180°C is?

(Cu = 63.5, S = 32, O = 16)
  • A. 0.13
  • B. 0.25
  • C. 1.25
  • D. 2.00
View Answer & Discuss (7) JAMB 1990
698
Smoke consist of?
  • A. solid particles dispersed in liquid
  • B. solid or liquid particles dispersed in gas
  • C. gas or liquid particles dispersed inliquid
  • D. liquid particles dispersed inliquid
View Answer & Discuss (5) JAMB 1990
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699
Na2C2O4 + CaCl2 → CaC2O4 + 2NaCl. Given a solution of 1.9g of sodium oxalate in 50g of water at room temperature, calculate the minimum volume of 0.1 M calcium oxalate using the above equation?
  • A. 1.40 χ 102 dm3
  • B. 14.0 χ 102 cm3
  • C. 1.40 χ 10-2 dm-2
  • D. 14.0 χ 10-2 cm3
View Answer & Discuss (9) JAMB 1990
700
2.0g of a monobasic acid was made up to 250 cm3 with distilled water. 25.00 cm3 of this solution required 20.00cm3 of 0.1 M NaOH solution for complete neutralization. The molar mass of the acid is?
  • A. 200 g
  • B. 160 g
  • C. 100 g
  • D. 50 g
View Answer & Discuss (10) JAMB 1990
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