1. Respiration is: (1)
(1) oxidation
(2) reduction
(3) hydrolysis
(4) animation
2. Aluminum can be purified by : (3)
(1) Oxidation
(2) distillation
(3) electrolysis
(4) ozonolysis
3. Impure camphor is purified by : (1)
(1) sublimation
(2) fractional crystallization
(3) fractional distillation
(4) steam distillation
4. During photosynthesis green plants absorb. (2)
(1) nitrogen
(2) carbon dioxide
(3) carbon monoxide
(4) oxygen
5. Greenhouse effect is caused by : (2)
(1) nitrogen
(2) carbon dioxide
(3) carbon monoxide
(4) nitrogen dioxide