JEE Main · ChemistryMedium
Which of the following statements is true regarding the reaction of alkali metals with water?
- A.The reactivity decreases from lithium to cesium.
- B.The reaction is endothermic.
- C.The reaction produces hydrogen gas and metal hydroxide.
- D.Lithium reacts most vigorously with water.
Show correct answer & step-by-step solution
Correct answer: C — The reaction produces hydrogen gas and metal hydroxide.
Solution
- Alkali metals react with water according to the general equation .
- The reactivity increases down the group as the ionization energy decreases, making cesium the most reactive.
- The reaction is highly exothermic, often leading to the ignition of the evolved hydrogen gas.
- Hence the answer is (C).
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