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Question
Assertion :Water becomes less dense when the temperature goes from 40C to 00C. Reason: The density becomes less and less as it freezes because molecules of water normally form open crystal structures when in solid form.
Assertion :Water becomes less dense when the temperature goes from 40C to 00C. Reason: The density becomes less and less as it freezes because molecules of water normally form open crystal structures when in solid form.
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
When Water is in its Solid Form(Ice) below 0° C, it has a Cage like Structure within which gases are trapped due to which Volume of Ice is large.At 4° C, the Cage like Structure of Ice starts to break and the Gases escape out due to which momentarily the Volume of Water decreases. Due to decrease in Volume, Density increases because Density is inversely proportional to Volume.As temperature rises to over 4° C, Water starts to flow and the molecules start to move away from each other due to which the Volume again increases and Density decreases.
Thus, Density is maximum at 4°C.
Hence option A is correct
When Water is in its Solid Form(Ice) below 0° C, it has a Cage like Structure within which gases are trapped due to which Volume of Ice is large.At 4° C, the Cage like Structure of Ice starts to break and the Gases escape out due to which momentarily the Volume of Water decreases. Due to decrease in Volume, Density increases because Density is inversely proportional to Volume.As temperature rises to over 4° C, Water starts to flow and the molecules start to move away from each other due to which the Volume again increases and Density decreases.
Thus, Density is maximum at 4°C.
Hence option A is correct
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