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A solution reacts with crushed-egg shells to give a gas that turns lime-water milky. The solution contains
(a) NaCl
(b) HCl
(c) LiCl
(d) KCl
Correct Answer: (b) HCl
Explanation: The eggshell contains calcium carbonate, which on reaction with HCl liberates CO2 gas which turn lime water to milky.
CaCO3 + 2HCl → CaCl2 + H2O + CO2
The gas thus formed is an effervescent carbon dioxide gas when calcium carbonate reacts with hydrochloric acid.
[Extra information: pH stands for "power of hydrogen".The "H" is capitalized because it is the hydrogen element symbol.
Acidic and basic are two extremes that describe a chemical property chemical. The pH scale measures how acidic or basic a substance is.
- The pH scale ranges from 0 to 14.
- A pH less than 7 is acidic in nature.
- A pH of 7 is neutral.
- A pH greater than 7 is basic in nature.
pH decreases with an increase in temperature. This does not mean that the water becomes more acidic at higher temperatures. A solution is considered acidic if there is an excess of hydrogen ions (H) over hydroxide ions (OH-).
(Refer to image for better understanding)
Updated on: 14-Mar-2023
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