Solid Calcium oxide reacts vigorously with water to form Calcium hydroxide accompanied by the liberation of heat. From the information given above it may be concluded that this reaction
- is endothermic and pH of the solution formed is more than 7.
- is exothermic and pH of the solution formed is 7.
- is endothermic and pH of the solution formed is 7.
- is exothermic and pH of the solution formed is more than 7.
The Correct Option is D
Solution and Explanation
The reaction between calcium oxide (quicklime) and water is highly exothermic and produces calcium hydroxide (a strong base), which increases the solution’s pH:
\[\text{CaO (s)} + \text{H}_2\text{O (l)} \rightarrow \text{Ca(OH)}_2 \, + \, \text{heat}.\]
As calcium hydroxide is a base, the pH of the solution is greater than 7.
Top Questions on Chemical Reactions
- The species which does not undergo disproportionation reaction is:
- JEE Main - 2025
- Chemistry
- Chemical Reactions
For a reaction, \[ {N}_2{O}_5(g) \rightarrow 2{NO}_2(g) + \frac{1}{2} {O}_2(g) \] in a constant volume container, no products were present initially. The final pressure of the system when 50% of the reaction gets completed is:
- JEE Main - 2025
- Chemistry
- Chemical Reactions
In Carius method for estimation of halogens, 180 mg of an organic compound produced 143.5 mg of AgCl. The percentage composition of chlorine in the compound is ___________%. [Given: Molar mass in g mol\(^{-1}\) of Ag = 108, Cl = 35.5]
- JEE Main - 2025
- Chemistry
- Chemical Reactions
- Identify A, B, and C in the given reaction sequence: \[ \text{A} \xrightarrow{\text{HNO}_3} \text{Pb(NO}_3)_2 \xrightarrow{\text{H}_2\text{SO}_4} \text{B} \rightarrow \text{C (Yellow ppt)}. \]
- JEE Main - 2025
- Chemistry
- Chemical Reactions
- Given below are two statements: Statement (I): The boiling points of alcohols and phenols increase with increase in the number of C-atoms.
Statement (II): The boiling points of alcohols and phenols are higher in comparison to other classes of compounds such as ethers and haloalkanes. In the light of the above statements, choose the correct answer from the options given below:- JEE Main - 2025
- Chemistry
- Chemical Reactions
Questions Asked in CBSE X exam
- Who was Henry? What role did he play in Ausable’s plan?
(The Midnight Visitor)- CBSE Class X - 2024
- The Midnight Visitor
- The roots of the quadratic equation \(x^2 + x – p (p + 1) = 0 \)are :
- CBSE Class X - 2024
- Quadratic Equations
- The pH of an aqueous solution of a salt is 9. The types of acid and base from which this salt is formed are:
- CBSE Class X - 2024
- Acids, Bases And Salts
- The sum of two numbers is 18, and the sum of their reciprocals is $\frac{1}{4}$. Find the numbers.
- CBSE Class X - 2024
- Linear Equations
- The vertices of a quadrilateral ABCD are A(6, – 2), B(9, 2), C(5, – 1) and D(2, – 5). Prove that ABCD is a rhombus, and not a square.
- CBSE Class X - 2024
- Coordinate Geometry