Answer:
Different materials have different densities. So it is False
Answer : The incorrect option is, The most of the mass of the atom comes from the electron cloud.
Explanation :
There are three basic particles of an atom which are neutrons, protons and electrons.
The nucleus which is present in the center of an atom that contains the neutrons and the protons. The protons are positively charged and neutrons has no charge.
The outer region of an atom contains the electrons and the electrons are negatively charged.
As per given options, the statement which is the most of the mass of the atom comes from the electron cloud is incorrect statement because the most of the mass comes from the nucleus in which protons and neutrons are present.
Composting is not a technological way of improving air quality.
I hope this helps!
When we are performing IR spectroscopy for Cyclohexane and cyclohexene, we can distinguish them as cyclohexene has C-H carbon-hydrogen stretching so, it shows the absorption at 3000-2850 cm⁻¹ range, where the cyclohexane do not have this and it shows the -C=C- stretch at 1640-1680 cm⁻¹ range in the spectrum. So that is how we can distinguish both.
Answer: 
will make an electrolytic solution
Explanation:
Electrolyte is a substance which dissociates into ions when dissolved in water and thus is able to conduct electric current through them.
Compounds in solid form does not conduct electricity due to the absence of free ions.
a) 
is a covalent compound and thus not an electrolyte.
b) 
is a covalent compound and thus do not dissolve in water and thus is not an electrolyte.
c) is an ionic compound and thus dissolve in water and give ions which help to conduct electricity.
d) 
is a covalent compound and thus do not dissolve in water and thus is not an electrolyte.
