Solubility - Jamb Chemistry Past Questions and Answers

Question 6:

• JAMB 1980

Which of the following silver halides is readily soluble in ammonium hydroxide?

A. Agl
B. AgBr
C. AgCl
D. AgF
E. None of the above

Question 7:

• JAMB 1980

Which of the following tests would confirm-unequivocally that a solution X contain the sulphate ion if it gives with

A. Silver nitrates solution, a white precipates insoluble in dilute HNO₃
B. Barium chloride solution, a white precipitate insoluble in dilute H₂SO₄
C. Barium chloride solution, a white precipitate insoluble in dilute HCl
D. Barium chloride solution a white precipitate soluble in dilute ammonia
E. Barium chloride solution a white precipitate insoluble in dilute HCl

Question 8:

• JAMB 1980

When copper (ii) sulphate solution is treated with excess ammonium hydroxide, a precipitate is first formed, and then this dissolves to give a deep blue solution. This deep blue solution is a

A. Cu(OH)₂
B. CuSo₄.5H₂O
C. (NH₄)₂SO₄
D. Cu(NH₃)₄(OH)₂
E. CuSO₄.(NH₄)₂SO₄.2H₂O

Question 9:

• JAMB 1980

Detergents are more advantageous than soaps in hard water districts because

A. On treatment with hard water they either form soluble calcium salts or do not react with calcium ion
B. On treatment with hard water they form soluble calcium salts
C. On treatment with hard water they form sodium salts
D. On treatment with hard water they are converted into soaps
E. On treatment with hard water they form more lather than soaps does

Question 10:

• JAMB 1981

If concentrated sulphric acid is added to sugar and warmed gently, the sugar changes from white to brown and finally to a black mas of carbon. In this reaction, concentrated sulphuric acid is acting as ?

A. A drying agent
B. An oxidizing agent
C. A dehydrated agent
D. A reducing agent
E. A hydrolysing agent