Jamb Chemistry 2017 Past Questions and Answers

Question 46:

• JAMB 2017

Due to the high reactivity of sodium, it is usually stored under

A. Water
B. Mercury
C. Paraffin
D. Phenol

Question 47:

• JAMB 2017

The furring of kettles is caused by the presence in water of

A. Calcium hydrogentrioxocarbonate (IV)
B. Calcium trioxocarbonate (IV)
C. Calcium tetraoxosulphate (VI)
D. Calcium hydroxide

Question 48:

• JAMB 2017

Water for town supply is chlorinate to make it free from

A. Bad colour
B. Bacteria
C. Temporary hardness
D. Permanent hardness

Question 49:

• JAMB 2017

Ca(OH)_2(s) + 2NH₄Cl_(g) → CaCl_2(s) + 2H₂O_2(l) + X. In the reaction above X is

A. NO₂
B. NH₃
C. N₂O
D. NO₂