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Q.

Chemical formula of washing soda is:


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a

<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>Na</mi><mn>2</mn></msub><msub><mi>CO</mi><mn>3</mn></msub></math>

b

<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>Na</mi><mn>2</mn></msub><msub><mi>CO</mi><mn>3</mn></msub><mo>.</mo><mn>10</mn><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mi mathvariant="normal">O</mi></math>

c

<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>Na</mi><mn>2</mn></msub><msub><mi>CO</mi><mn>3</mn></msub><mo>.</mo><mn>5</mn><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mi mathvariant="normal">O</mi></math>

d

<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>Na</mi><mn>2</mn></msub><msub><mi>SO</mi><mn>4</mn></msub><mo>.</mo><mn>10</mn><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mn>0</mn></math> 

answer is B.

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Detailed Solution

concept - Washing soda is the hydrated form of sodium carbonate, ( Na 2 CO 3 ) and it is the washing powder that is used at home.
The chemical formula of washing soda is <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>Na</mi><mn>2</mn></msub><msub><mi>CO</mi><mn>3</mn></msub><mo>.</mo><mn>10</mn><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mi mathvariant="normal">O</mi></math>. Its chemical name is sodium carbonate decahydrate. It is a white crystalline solid.
Uses of washing soda are-
●       It is used as a cleaning agent in industry and households.
●       It is used in the paper, textile, soap and laundry industries.
●       It is used in the water softening process.
●       It is used in the production of glass.
●       It is one of the most important products in laundries.
Hence, the correct answer is 2.
 
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Chemical formula of washing soda is: