Q34
1 markMCQSection B

Acetic acid reacts with solid sodium hydrogen carbonate

Chemical Reactions and Equations
Evolution of Gas

Options

(A)slowly forming no gas.
(B)vigorously with effervescence.
(C)slowly without effervescence.
(D)vigorously without gas formation.
Official Answer

The correct option is B. Acetic acid reacts vigorously with solid sodium hydrogen carbonate to produce carbon dioxide gas, which results in brisk effervescence.

EffervescenceCarbon dioxideSodium hydrogen carbonateVigorous reactionEvolution of gas

Marking Scheme

  • 1Selection of correct option (1 mark)

Hint

What happens when you mix baking soda (sodium hydrogen carbonate) with an acid?

Quick Oral Answer

The reaction produces carbon dioxide gas. We observe this as brisk effervescence or rapid bubbling, similar to how H2H_2 gas is evolved when zinc reacts with sulphuric acid.

Analysis & Explanation

The text identifies 'evolution of a gas' as a key observation to determine if a chemical reaction has taken place (Section 1.1, Activity 1.3). When an acid like acetic acid reacts with a carbonate or hydrogen carbonate, it produces CO2CO_2 gas. The reaction is: CH3COOH(aq)+NaHCO3(s)ightarrowCH3COONa(aq)+H2O(l)+CO2(g)↑CH_3COOH(aq) + NaHCO_3(s) ightarrow CH_3COONa(aq) + H_2O(l) + CO_2(g) \uparrow. The rapid release of CO2CO_2 bubbles is described as 'brisk effervescence'. This is similar to the observation in Activity 1.3 where gas bubbles form around zinc granules.

Common Mistakes

  1. 1Thinking the reaction is slow.
  2. 2Assuming no gas is formed because it isn't a strong mineral acid like HClHCl.

Interesting Facts

This reaction is the basis for 'chemical volcanoes' used in school science projects due to the rapid production of gas.

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Frequently Asked Questions

How many marks does this question carry in CBSE Class 10 Science 2011?

This question carries 1 mark in the CBSE Class 10 Science 2011 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 "Evolution of Gas" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2011 paper?

This is a MCQ question from Section B in the CBSE Class 10 Science 2011 paper.