Helium is often used in observation balloons because it i...
Helium is often used in observation balloons because it is?
light and combustible
light and non-combustible
heavy and combustible
heavy and non-combustible
Correct answer is B
No explanation has been provided for this answer.
In the purification of town water supply, alum is used principally to? ...
The number of waves in n x 10th Bohr's orbit are ...
Which of the following relationships correctly expresses the Boyle's law? ...
The process by which salt and water reacted in a limited way to form an acid or a base is? ...
Which of the following statements is true about 2-methylpropane and butane ...