I only
I, II and IV
I and II only
I, II, III, and IV
Correct answer is D
- Calcium trioxocarbonate (IV) occurs abundantly in earth's crust as limestone, chalk and marble
- Eggshell is made almost entirely of calcium carbonate (CaCO3) crystals.
James Chadwick
Ernest Rutherford
J.J Thompson
John Dalton
Correct answer is A
- Sir James Chadwick, was a British physicist who was awarded the 1935 Nobel Prize in Physics for his discovery of the neutron in 1932.
- Ernest Rutherford postulated the nuclear structure of the atom, discovered alpha and beta rays, and proposed the laws of radioactive decay.
- Sir Joseph John Thomson was a British physicist and Nobel Laureate in Physics, credited with the discovery of the electron, the first subatomic particle to be discovered.
- John Dalton was an English chemist, physicist and meteorologist. He is best known for introducing the atomic theory into chemistry
The maximum electron in N shell is?
2
8
18
32
Correct answer is D
The N shell is the fourth orbit with 32 max number of electrons using 2n\(^2\)
Sublimation
Evaporation
Diffusion
Radiation
Correct answer is A
Sublimation is the transition of a substance directly from the solid to the gas state, without passing through the liquid state.
Familiar substances that sublime readily include iodine, dry ice, menthol, and camphor.
Kerosene
Soil
Glass
Cement
Correct answer is A
Kerosene contains hydrocarbon with twelve to eighteen carbon atoms per molecule