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Question

A piece of calcium metal is placed in water. A reaction takes place in which bubbles of hydrogen gas are seen. After the reaction stops, the solution is tested for its colour, temperature and action with litmus solution. Select the correct observation
318864_7d2c8023a2f54a4c8a9e25326fc911d9.png
  1. The solution is hot, milky white and turns red litmus blue
  2. The solution is hot, colourless and turns blue litmus red
  3. The solution is cold, milky and turns blue litmus red
  4. The solution is cold, colourless and does not change the colour of litmus.

A
The solution is hot, milky white and turns red litmus blue
B
The solution is cold, milky and turns blue litmus red
C
The solution is hot, colourless and turns blue litmus red
D
The solution is cold, colourless and does not change the colour of litmus.
Solution
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Calcium reacts with water to form calcium hydroxide and hydrogen. It is an exothermic process so the solution formed is hot. Calcium hydroxide is basic in nature so it turns red litmus blue. When carbon dioxide is passed through lime water it turns milky.

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