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Chemistry · 2026 · 2 marks
CBSE 2026 · Region 4 · Set 1 · Q18
(a) Explain the following with the help of Henry's law: (i) Bends (ii) Anoxia
(a)
Explain the following with the help of Henry's law :
(i)
Bends
(ii)
Anoxia
OR
(b)
How does sprinkling of salt help in clearing the snow covered roads in hilly areas ? Write the name of the colligative property involved in this process.
Marking-scheme solution
(i)
Bends is a painful medical condition experienced by Scuba divers when they
come towards surface where the pressure gradually decreases leading to formation of
bubbles of nitrogen in the blood blocking the capillaries.
(ii)
Anoxia is a condition experienced by people living at high altitudes due
to low partial pressure of oxygen or due to low blood oxygen in their tissues
making them feel weak and unable to think clearly.
Salt lowers the freezing point of snow which then melts and can be removed easily.
Depression of Freezing point
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CBSE Class 12 Chemistry past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.