Question : The chemical formula of washing soda is
Option 1: Na2So4 .10H2O
Option 2: NaHCO3
Option 3: Na2CO3.10H2O
Option 4: Ca(OH)2
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Correct Answer: Na2CO3.10H2O
Solution : The correct answer is Na2CO3.10H2O.
Sodium carbonate decahydrate (Na2CO3·10H2O), also known as washing soda, is the most common hydrate of sodium carbonate, having 10 molecules of water of crystallization. Soda ash is dissolved in water and crystallized to get washing soda.
Na2CO3+10H2O⟶Na2CO3⋅10H2O
It is one of the few metal carbonates that is soluble in water.
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Question : The chemical formula of acetic acid is
Option 1: CH3COH
Option 2: CH3COOH
Option 3: CH3COCH3
Option 4: CH2COOH
Question : What is the name of the chemical compound having the molecular formula C3H4O, which is used for the production of acrylic acid and acrylate ester?
Option 1: Naphthaldehyde
Option 2: Vanillin
Option 3: Acrolein
Option 4: Muscone
Question : The buffer action of blood is due to the presence of:
Option 1: HCl and NaCl
Option 2: Cl- and CO32-
Option 3: Cl- and HCO-3
Option 4: HCO3- and H2CO3
Question : Which of the following metal salts is responsible for permanent hardness in water?
Option 1: KCl
Option 2: Nacl
Option 3: Ca(HCO3)2
Option 4: CaCl2
Question : A substance used as an antifreeze in radiators of automobiles is:
Option 1: Methyl alcohol and H2O.
Option 2: Methyl alcohol
Option 3: Ethyl alcohol
Option 4: Ethyl alcohol and H2O.
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