Chemistry

Brain tumors can be located by using an isotope of?

A. carbon - 14 B. iodine 131 C. technetium 99 D. uranium235 E. uranium 238 Correct Answer: Option C -…

3 years ago

During the extraction of iron in the blast furnace; slag is produced using?

A. carbon B. crylite C. limestone D. oxygen E. sulphur Correct Answer: Option C - limestone

3 years ago

Which of the following gases is absorbed from the air during photosynthesis?

A. Carbon (II) oxide B. Carbon (IV) oxide C. Nitrogen D. Noble gases E. Oxygen Correct Answer: Option B -…

3 years ago

When dust particles collide randomly in a beam of Sunlight, the phenomenon observed is known as?

A. Brownian movement. B. Dialysis C. Diffusion D. Osmosis E. Tyndall effect Correct Answer: Option E - Tyndall effect Explanation…

3 years ago

The most efficient absorber of ultraviolet radiation in the atmosphere is?

A. CO2 B. H2 C. H2O D. O2 E. O3   Correct Answer: Option E - O3

3 years ago

Chlorine atom forms Cl‾ by?

A. donating lone pair of electrons B. gaining an electron C. losing an electron D. sharing an electron E. sharing…

3 years ago

The type of reaction ethyne mainly undergoes is?

A. addition B. carboxylation. C. esterification D. saponification E. substitution Correct Answer: Option A - addition

3 years ago

All the following belong to the same family EXCEPT?

A. glycerol B. nylon C. perspex polyethene D. polyethene E. polystyrene Correct Answer: Option A - glycerol

3 years ago

Ptotal = P1 + P2 + P3 +…………. Pn. Is an expression of law?

A. Boyle’s B. Charles’ C. Dalton’s D. Graham’s E. Gay Lussac’s Correct Answer: Option C - Dalton’s

3 years ago