Which of the following substances is the most soluble in water?
2 answers:
Answer: A. Sodium chloride
Explanation: Sodium chloride ( is an ionic compound formed by transfer of electrons from sodium to chlorine.
Electronic configuration of sodium:
Sodium atom will loose one electron to gain noble gas configuration and form sodium cation with +1 charge.
Electronic configuration of chlorine:
Chlorine atom will gain one electron to gain noble gas configuration and form chloride ion with -1 charge.
These ions can be separated in polar solvent water and thus are soluble in water.
Whereas methane ( is a covalent compound formed by sharing of electrons and is soluble in non polar solvents.
Bromine is a covalent compound formed by sharing of electrons and is soluble in non polar solvents.
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Answer: Mixture
Explanation:
Element is a pure substance which is composed of atoms of similar elements.
Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.
Mixture is a substance which has two or more components which do not combine chemically and do not have any fixed ratio in which they are present. Example: Air which conatins a mixture of ,
,
and
Answer: Option (B) is the correct answer.
Explanation:
When two circles are of same same then they are known as congruent circles.
Whereas a rectangle is a kind of parallelogram with all sides equal to .
Therefore, when 2 congruent circles and 1 rectangle combines then it results in the formation of a cylinder.
Thus, we can conclude that solid formed when 2 congruent circles and 1 rectangle combines will be a circle.
