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Chemistry 2006 WAEC Past Questions

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1
How many orbitals are in the d-sub shell?
  • A. 1
  • B. 3
  • C. 5
  • D. 7
View Answer & Discuss (3) WAEC 2006
2
An element X has isotopic masses of 6 and 7. if the relative abundance is 1 to 12.5 respectively, what is the relative atomic mass of X?
  • A. 6.0
  • B. 6.1
  • C. 6.9
  • D. 7.0
View Answer & Discuss (1) WAEC 2006
3
An atom 23892X decays by alpha particle emission to give an atom Y. The atomic number and mass number of Y are
  • A. 90 and 234 respectively
  • B. 91 and 238 respectively
  • C. 92 and 236 respectively
  • D. 93 and 238 respectively
View Answer & Discuss WAEC 2006
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4
If 1 mole of sodium contains 6 x 1023 atoms, how many atoms are contained in 0.6 g of sodium? [Na = 23]
  • A. 1.56 x 1023
  • B. 1.56 x 1022
  • C. 3.6 x 1023
  • D. 3.6 x 1022
View Answer & Discuss (1) WAEC 2006
5

If 20 cm3 of distilled water is added to 80cm 3 of 0. 50 mol dm-3 hydrochloric acid, the new concentration of the acid will be

  • A. 0.10mol dm-3
  • B. 0.20mol dm-3
  • C. 0.40mol dm-3
  • D. 2.00mol dm-3
View Answer & Discuss (13) WAEC 2006
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