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21

if an element X with atomic number 13 combines with an element Y whose atomic number is 8 the most likely formula of the compound formed between X and Y is?

  • A. XY
  • B. X2Y
  • C. XY2
  • D. X3Y2
  • E. X2Y3
View Answer & Discuss (6) NECO 2001
22

If the relative atomic mass of an element is not a whole number, it can be deduced that the element is?

  • A. Naturally radioactive
  • B. abundant in nature
  • C. a transition metal
  • D. an isotopic mixture
View Answer & Discuss (13) JAMB 2009
23

The number of molecules of Carbon(iv)Oxide produced when 10.0g of CaCO\(_3\) is treated with 0.2dm\(^3\) of 1 Mole of HCL in the equation

CaCO\(_3\) + 2HCL ⇒  CaCl\(_2\)  + H\(_2\) O + CO\(_2\)  , is?

  • A. 1.00 X 10\(^{23}\)
  • B. 6.02 X 10\(^{23}\)
  • C. 6.02 X 10\(^{22}\)
  • D. 6.02 X 10\(^{24}\)
View Answer & Discuss (11) JAMB 2020
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24

consider the following reaction equation: 2Al(OH)\(_3\) + 3H\(_2\)SO\(_4\) Al\(_2\)(SO4)\(_3\)(aq)+6H\(_2\)O. How many moles of tetraoxosulphate(vi)acid is needed to produce 0.5mol of aluminium tetraoxosulphate(vi)?

  • A. 0.5
  • B. 1.0
  • C. 1.5
  • D. 3.0
View Answer & Discuss (3) WAEC 2019
25

The atomic weight of nitrogen is?

  • A. 10
  • B. 12
  • C. 14
  • D. 16
View Answer & Discuss (1) JAMB 2021
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