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(D) $1$. Calcium reacts with water less violently compared to sodium or potassium.$2$. The chemical reaction is: $Ca(s) + 2H_2O(l) \rightarrow Ca(OH)_

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$(ii)$ and $(iv)$

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(D) $1$. Calcium reacts with water less violently compared to sodium or potassium.$2$. The chemical reaction is: $Ca(s) + 2H_2O(l) \rightarrow Ca(OH)_2(aq) + H_2(g)$.$3$. During this reaction, the hydrogen gas produced forms bubbles that stick to the surface of the calcium metal.$4$. Due to these bubbles, the calcium metal starts floating on the surface of the water.$5$. Thus, statements $(ii)$ and $(iv)$ are correct. Therefore, the correct option is $D$.

Which of the following observations are correct when calcium is treated with water?
$(i)$ It reacts violently with water.
(ii) It reacts less violently with water.
(iii) The bubbles of hydrogen gas formed stick to the surface of the calcium.
(iv) The calcium starts floating.

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Which of the following observations are correct when calcium is treated with water?$(i)$ It reacts violently with water.(ii) It reacts less violently with water.(iii) The bubbles of hydrogen gas formed stick to the surface of the calcium.(iv) The calcium starts floating.