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What happens when calcium is treated with water ?
(i) It does not react with water.
(ii) It reacts violently with water.
(iii) It reacts less violently with water.
(iv) Bubbles of hydrogen gas formed stick to the surface of calcium.
  • a)
    (i) and (iv)
  • b)
    (ii) and (iii)
  • c)
    (i) and (ii)
  • d)
    (iii) and (iv)
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
What happens when calcium is treated with water ?(i) It does not react...
Calcium reacts comparatively less violently with water and floats on the surface due to hydrogen gas sticking to the surface of the metal.
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Most Upvoted Answer
What happens when calcium is treated with water ?(i) It does not react...
Among alkaline earth metals only beryllium and magnesium react vigorously with water. Calcium react moderately with cold water. On reacting with water it forms calcium hydroxide and hydrogen gas, which sticks to the surface of water.
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Community Answer
What happens when calcium is treated with water ?(i) It does not react...
When calcium is treated with water, it reacts to form calcium hydroxide and hydrogen gas. The reaction is as follows:

Ca + 2H2O -> Ca(OH)2 + H2

(i) It does not react with water.
This statement is incorrect. Calcium does react with water to form calcium hydroxide and hydrogen gas. Therefore, option (i) is not correct.

(ii) It reacts violently with water.
This statement is correct. When calcium reacts with water, it produces a vigorous reaction. The reaction is exothermic and releases a large amount of heat. The heat generated can be sufficient to ignite the hydrogen gas produced, resulting in a small explosion. This is why calcium is considered to react violently with water. Therefore, option (ii) is correct.

(iii) It reacts less violently with water.
This statement is incorrect. As mentioned above, calcium reacts violently with water due to the exothermic nature of the reaction. Therefore, option (iii) is not correct.

(iv) Bubbles of hydrogen gas formed stick to the surface of calcium.
This statement is correct. As the calcium reacts with water, bubbles of hydrogen gas are produced. These bubbles tend to stick to the surface of the calcium, creating a frothy appearance. Therefore, option (iv) is correct.

In conclusion, options (ii) and (iv) are the correct statements regarding the reaction of calcium with water.
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What happens when calcium is treated with water ?(i) It does not react with water.(ii) It reacts violently with water.(iii) It reacts less violently with water.(iv) Bubbles of hydrogen gas formed stick to the surface of calcium.a)(i) and (iv)b)(ii) and (iii)c)(i) and (ii)d)(iii) and (iv)Correct answer is option 'D'. Can you explain this answer?
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