Q7
1 markMCQSection A

Baking soda is a mixture of:

Acids, Bases and Salts
Baking Powder and Baking Soda

Options

(0)Sodium carbonate and acetic acid
(1)Sodium carbonate and tartaric acid
(2)Sodium hydrogen carbonate and tartaric acid
(3)Sodium hydrogen carbonate and acetic acid
Official Answer

The correct option is C.

Sodium hydrogen carbonatetartaric acidbaking powder

Marking Scheme

  • 11 mark for selecting the correct option (C).

Hint

Think about the mild edible acid added to sodium hydrogencarbonate to neutralize its bitter taste in baked goods.

Quick Oral Answer

Baking powder is a mixture of sodium hydrogencarbonate and a mild edible acid like tartaric acid.

Analysis & Explanation

In commercial and culinary contexts, baking powder is often referred to as a baking soda mixture. Baking powder is a mixture of baking soda (sodium hydrogencarbonate, NaHCO3NaHCO_3) and a mild edible acid such as tartaric acid.

  • Option A and B are incorrect because sodium carbonate (Na2CO3Na_2CO_3) is washing soda, not baking soda.
  • Option D is incorrect because acetic acid is a liquid with a strong vinegar odour and is not used in dry baking powder formulations.
  • Option C is correct because tartaric acid reacts with sodium hydrogencarbonate when wet or heated to release carbon dioxide gas, which makes cakes and breads rise.

Common Mistakes

  1. 1Confusing pure baking soda (sodium hydrogencarbonate) with baking powder (the mixture of baking soda and tartaric acid).
  2. 2Confusing sodium carbonate with sodium hydrogencarbonate.

Interesting Facts

When baking powder reacts with water or heat, carbon dioxide gas is released as bubbles, which get trapped in the wet dough, causing it to expand and become fluffy.

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Frequently Asked Questions

How many marks does this question carry in CBSE Class 10 Science 2020?

This question carries 1 mark in the CBSE Class 10 Science 2020 examination.

Which chapter does this question come from in Science?

This question is from the chapter "Acids, Bases and Salts" in the CBSE Class 10 Science syllabus.

What topic does this question cover in Science?

This question covers the topic "Baking Powder and Baking Soda" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2020 paper?

This is a MCQ question from Section A in the CBSE Class 10 Science 2020 paper.