Which of the following is an unsaturated hydrocarbon?
A. Benzene
B. Methane
C. Propane
D. Cyclohexane
Answer: Option A
Solution (By JKSSB Mock Tests)
Unsaturated hydrocarbons contain at least one double or triple bond between carbon atoms. Benzene (C6H6) has a ring structure with alternating double bonds (delocalized pi electrons), making it highly unsaturated. Cyclohexane, propane, and methane contain only single bonds and are saturated hydrocarbons.
Explanation:
Permanent hardness is due to CaCl₂, CaSO₄, MgCl₂, MgSO₄. These do not precipitate on boiling. Temporary hardness (bicarbonates) is removed by boiling. Both can be removed by ion exchange or washing soda.
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