Q2
1 markMCQSection A

The balanced chemical equation showing reaction between quicklime and water is :

Chemical Reactions and Equations
Chemical Equations

Options

(a)2CaO+H2O⟶2CaOH+H2+Heat2\mathrm{CaO} + \mathrm{H}_2\mathrm{O}\longrightarrow 2\mathrm{CaOH} + \mathrm{H}_2 + \mathrm{Heat}
(b)CaO+H2O⟶Ca(OH)2+H2+Heat\mathrm{CaO} + \mathrm{H}_2\mathrm{O}\longrightarrow \mathrm{Ca(OH)}_2 + \mathrm{H}_2 + \mathrm{Heat}
(c)CaO+H2O⟶Ca(OH)2+Heat\mathrm{CaO} + \mathrm{H}_2\mathrm{O}\longrightarrow \mathrm{Ca(OH)}_2 + \mathrm{Heat}
(d)2CaO+3H2O⟶2Ca(OH)3+O2+Heat2\mathrm{CaO} + 3\mathrm{H}_2\mathrm{O}\longrightarrow 2\mathrm{Ca(OH)}_3 + \mathrm{O}_2 + \mathrm{Heat}
Official Answer

CaO+H2O⟶Ca(OH)2+Heat\mathrm{CaO} + \mathrm{H}_2\mathrm{O}\longrightarrow \mathrm{Ca(OH)}_2 + \mathrm{Heat}

quicklimewatercalcium hydroxideheat

Marking Scheme

  • 11 mark

Hint

Quicklime reacts with water to form calcium hydroxide and heat

Quick Oral Answer

The reaction between quicklime and water produces calcium hydroxide and heat

Analysis & Explanation

The balanced chemical equation showing reaction between quicklime and water is CaO+H2O⟶Ca(OH)2+Heat\mathrm{CaO} + \mathrm{H}_2\mathrm{O}\longrightarrow \mathrm{Ca(OH)}_2 + \mathrm{Heat}

Common Mistakes

  1. 1Adding extra reactants or products
  2. 2Incorrect balancing of the equation

Interesting Facts

Quicklime is highly reactive and can cause burns

Calcium hydroxide is used in construction and paper production

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Frequently Asked Questions

How many marks does this question carry in CBSE Class 10 Science 2023?

This question carries 1 mark in the CBSE Class 10 Science 2023 examination.

Which chapter does this question come from in Science?

This question is from the chapter "Chemical Reactions and Equations" in the CBSE Class 10 Science syllabus.

What topic does this question cover in Science?

This question covers the topic "Chemical Equations" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2023 paper?

This is a MCQ question from Section A in the CBSE Class 10 Science 2023 paper.