Which one of the following is the chemical formula of Washing Soda ?

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Q: 17 (NDA-I/2018)

Which one of the following is the chemical formula of Washing Soda ?

question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,17,8,3,17,2,3

keywords: 

{'chemical formula': [0, 0, 1, 3], 'washing soda': [0, 0, 0, 1], 'na2c03': [0, 0, 0, 2], 'nahc03': [0, 0, 0, 1], 'naoh': [0, 0, 1, 9]}

The correct chemical formula for Washing Soda is option 2: Na2CO3-10H2O.

Let`s break down each option to understand why option 2 is the correct answer:

Option 1: NaHCO3

This chemical formula represents sodium bicarbonate, commonly known as baking soda. Baking soda is different from washing soda, so this option is incorrect.

Option 2: Na2CO3-10H2O

This chemical formula represents sodium carbonate decahydrate. Washing soda, chemically known as sodium carbonate, is commonly found in its hydrated form, which means it contains water molecules (H2O). This option correctly shows the presence of 10 water molecules, indicating the hydrated form of washing soda.

Option 3: Na2CO3*5H2O

This chemical formula is similar to option 2 but represents sodium carbonate pentahydrate instead of the decahydrate form. This option is incorrect as washing soda is commonly found in the decahydrate form.

Option 4: NaOH

This chemical formula represents sodium hydroxide, also known as caustic soda. Sodium hydroxide is different from washing soda, so this option is incorrect.

In conclusion, option 2 (Na