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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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