Question 416:

• JAMB 1985

Solid sodium hydroxide on exposure to air absorbs a gas and ultimately gives another alkaline substance with the molecular formula?

A. NaOH.H₂O
B. NaOH.N₂
C. Na₂CO₃O
D. NaHCO₃
E. NaNO₃O

Question 417:

• JAMB 1985

Which of the following substances is the most abundant in the universe?

A. Carbon
B. Air
C. Water
D. Oxygen
E. Hydrogen

Question 418:

• JAMB 1985

A colourless organic compound X was burnt in excess air to give two colourless and odourless gases, Y and Z, as products. X does not decolorize blue bromine vapour, Y turns lime milky while Z gives a blue colour with copper (ll) tetraoxosulphate (IV).
Compound X is?

A. An alkene
B. An alkane
C. An alkyne
D. Tetrachloromethane
E. Dichloromethane

Question 419:

• JAMB 1985

A colourless organic compound X was burnt in excess air to give two colourless and odourless gases, Y and Z, as products. X does not decolorize blue bromine vapour, Y turns lime milky while Z gives a blue colour with copper (ll) tetraoxosulphate (IV).
Y and Z are respectively?

A. CO₂ and NH₃
B. CO and NH₃
C. SO₂ and H₂O
D. CO₂ and H₂O
E. SO₂ and NH₃

Question 420:

• JAMB 1985

Which of the following compounds is NOT the correct product formed when the parent metals is heated in air?

A. Calcium oxide (CaO)
B. Sodium oxide (Na₂O)
C. Copper (ll) oxide (CuO)
D. Tri-iron tetroxide (Fe₃O₄)
E. Aluminium oxide (Al₂O₃)