MEDIUM
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What happens when calcium reacts with water?
Important Questions on Sorting Materials into Groups
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Write a chemical equation for the reaction taking place in the test tube. How does the colour of the solution change? What is the change in colour of iron nails?

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Statement I: Sodium metal reacts violently with water to produce heat and fire.
Statement II: Potassium metal reacts violently with water to form potassium hydroxide and hydrogen gas.
Select the correct answer from the option given below

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(a) potassium
(b) sodium
(c) calcium

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(a) What is metal M?
(b) What is solution S? Is it acidic or alkaline?
(c) What is gas G?
(d) Write a balanced chemical equation for the reaction which takes place when metal M reacts with water.
(e) Is this reaction exothermic or endothermic?

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