The most common type of chemical reaction which alkanes undergo is
substitution
addition
condensation
polymerisation
double decomposition
Correct answer is A
No explanation has been provided for this answer.
Which of the following compounds will form a solution if exposed to air?
Na2CO3.10H2O
NaNO3
CuSO4
CaCl2
Na2SO4.10H2O
Correct answer is D
Calcium chloride is a deliquescent substance. It attracts water from the atmosphere and then forms a solution.
The normal boiling point of a liquid is defined as?
the temperature at which its vapour pressure equals the atmospheric pressure
the temperature at which bubbles begin to form
the temperature at which the vapour pressure equals 1 temperature
the temperature at which the rate of condensation of vapour equals the rate of vaporisation of the liquid
the temperature at which the space above the liquid is saturated
Correct answer is A
The boiling point of a substance is the temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid and the liquid changes into a vapor.
Hypochlorous acid is used as a bleach because
it is a strong acid
it yields chlorine readily in pure water
it is an oxidising agent
it is a weak acid
it is a reducing agent
Correct answer is C
No explanation has been provided for this answer.
The nucleus of an atom contains
protons only
neurons only
protons and electrons
neutrons and electrons
protons and neutrons
Correct answer is E
No explanation has been provided for this answer.