Question

Which of the following statements about the given chemical reactions is wrong ?

• A. Calcium hydroxide reacts instantly with the carbon dioxide in air to form a thin layer of calcium carbonate on the walls
• B. Reaction in which heat is released along with the formation of products are exothermic reactions
• C. $C{O}_{\left(g\right)}+2H_{2\left(g\right)}\stackrel{340atm}{\to }C{H}_{3}O{H}_{\left(l\right)}$
• D. Decomposition of silver chloride to silver and chlorine occurs in presence of light

Answer 1

The correct option is A Calcium hydroxide reacts instantly with the carbon dioxide in air to form a thin layer of calcium carbonate on the walls

Calcium hydroxide reacts slowly with the carbon dioxide in air to form a thin layer of calcium carbonate on the walls. Calcium carbonate is formed after two to three days of white washing and gives a shiny finish to the walls.