General Characteristics And Properties Of Acids, Bases, And Salts Jamb Chemistry Past Questions
Question 6
Mg2+(aq) + 2e->(aq) → Mg(s)E°(volts) = 2.370
Zn2+(aq) + 2e->(aq) → Zn(s)E°(volts) = -0.763
Cds2+(aq) + 2e->(aq) → Cd(s)E°(volts) = 0.403
Cu2+(aq) + 2e->(aq) → Cu(s)E°(volts) = 0.340
In the electrochemical series above, the strongest reducing agents is?
- A. Cu (s)
- B. Cd(s)
- C. Znsub>(s)
- D. Mg(s)
Question 7
Alloys are often used in preference to pure metals because?
- A. metals are too hard
- B. merals are ductile
- C. metallic properties are improve in alloys
- D. alloys are a mixture of metals
Question 8
In the reaction NH3 + H+ → NH4+, the bond formed results from?
- A. an electron transferred from NH3 + H+
- B. an electron pair donated by NH3
- C. an electron pair equally shared
- D. an electron pair donated by H+
- E. an electron tarnsferred from H+ to NH3
Question 9
Which of the following statements is incorrect?
- A. Calcium reacts with water to form calcium
- B. Magnesium reacts very slowly with water but faster with warm water
- C. Iron will not react with water in the absence of air
- D. Sodium reacts with water
- E. Copper reacts with steam
Question 10
When a little brine was added to a metal nitrate a white precipitate was formed which first turned violet and then black on exposure to ai. The metal nitrate is therefore?
- A. sodium nitrate
- B. mercuric nitrate
- C. lithium nitrate
- D. silver nitrate
- E. potassium nitrate
