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Chemistry Past Questions

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21

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 (15) JAMB 2020
22

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
23

The atomic weight of nitrogen is?

  • A. 10
  • B. 12
  • C. 14
  • D. 16
View Answer & Discuss (7) JAMB 2021
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24

The maximum electron in N shell is?

  • A. 2
  • B. 8
  • C. 18
  • D. 32
View Answer & Discuss (10) JAMB 2021
25

The mass number of a nucleus is?

  • A. Always less than its atomic number
  • B. The sum of the number of protons and neutrons present in the nucleus
  • C. Always more than the atomic weight
  • D. A fraction
View Answer & Discuss (4) JAMB 2021
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