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Question

A hygroscopic substance is _________.
  1. Sulfuric acid
  2. Water
  3. Washing soda
  4. Hydrogen

A
Washing soda
B
Hydrogen
C
Sulfuric acid
D
Water
Solution
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Sulphuric acid is a highly hygroscopic in nature reacting with water and it has a great affinity for water molecules forming more of hydronium ions. It is highly corrosive in nature and can cause severe burns. It extracts 'water of crystallization' molecules from the compounds

2SO2+2H2O+O22H2SO4 .

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