Скачать или смотреть JAMB - 2019 Chemistry (Questions 21 - 25)

JAMB 2019 Chemistry Consolidated Questions 21 - 25

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21. A solid begin to melt when
A. Constituent particles acquire a greater kinetic energy
B. Energy of vibration of particles of the solid is less than the intermolecular forces
C. Constituent particles acquire energy above the average kinetic energy
D. Energy of vibration of particles of the solid equals the intermolecular forces

22. The oxidation state of chlorine in HClO4 is
A. -5
B. -1
C. +1
D. +7

23. NH4Cl(s) « NH3(g) + HCl(g)
The reaction above van only attain equilibrium if
A. A gaseous reactant is added
B. One of the products is removed
C. It is in a closed system
D. It is in an open system

24. Nuclear fission involves the splitting of heavy element into two nuclei of
A. Nearly equal masses with a release of energy and radiation
B. Equal masses with a release of energy
C. Equal masses with a release of energy and radiation
D. Unequal masses without any release of energy

25. The most common ores of iron include;
A. Haematite, Malachite and Limonite
B. Chalcocite, Calamite and Bormite
C. Magnetite, Haematite and Limonite
D. Malachite, Chalcocite and Bormite