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Chemistry JAMB Past Questions

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951

The synthetic detergents are preferred to soap for laundry using hard water because?

  • A. detergents are water soluble while soap is not
  • B. the calcium salts of detergents are water soluble
  • C. the magnesium salt of soap is soluble in hard water
  • D. soap does not have a hydrocarbon terminal chain
View Answer & Discuss (8) JAMB 1997
952

25 cm\(^3\) of 0.02 M KOH neutralized 0.03 g of a monobasic organic acid having the general formula C\(_n\)H\(_{2n + 1}\)COOH. The molecular formula of the acid is?

(C = 12, H = 1, O = 16)

  • A. HCOOH
  • B. C2H5COOH
  • C. CH3COOH
  • D. C3H7COOH
View Answer & Discuss (17) JAMB 1997
953

 \(\frac{1}{2}\)N\(_2\)(g)  +   \(\frac{1}{2}\)O\(_2\)(g) → NO(g)  ∆H° =  89 KJ mol\(^{-1}\). If the entropy change for the reaction above at 25°C is 11.8 J mol\(^{-1}\), calculate the change in free energy. ∆G°, for the reaction at 25°C?

  • A. 88.71 KJ
  • B. 85.48 KJ
  • C. -204.00 KJ
  • D. -3427.40 KJ
View Answer & Discuss (19) JAMB 1997
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954
The addition of water to calcium oxide leads to?
  • A. a physical change
  • B. a chemical change
  • C. the formation of a mixture
  • D. an endothermic change
View Answer & Discuss (10) JAMB 1998
955
A mixture of iron and sulphur can be separated by dissolving the mixture in?
  • A. steam
  • B. dilute hydrochloric acid
  • C. dilute sodium hydroxide
  • D. benzene
View Answer & Discuss (24) JAMB 1998
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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