Radon is used as a tracer in medical research because it
is monatomic
is radioactive
is a noble gas
has a complete valence shell
has a low boiling point
Correct answer is B
No explanation has been provided for this answer.
0
1
2
6
8
Correct answer is A
No explanation has been provided for this answer.
The mass number of an element is the sum of its
electrons, neutrons and protons
electrons and protons
protons and neutrons
orbital electrons
valence electrons
Correct answer is C
No explanation has been provided for this answer.
The phenomenon observed when dust particles collide randomly in a beam of sunlight is known as?
Tyndal effect
diffusion
osmosis
brownian movement
dialysis
Correct answer is A
Tyndall effect, also called Tyndall phenomenon, scattering of a beam of light by a medium containing small suspended particles—e.g., smoke or dust in a room
The following salts will produce a gas on reacting with hydrochloric acid except
CuSO4
CaCO3
FeS
Na2SO3
K2CO3
Correct answer is A
No explanation has been provided for this answer.