Question

“Lithium is the only metal which floats on water without any apparent reaction with it.”
Answer whether the above statement is true or false.
It true enter 1, else enter 0

Answer 1

Hint: It has the least density of all elements that are solid at room temperature. It has only half the density of water. Less dense material floats over denser material. Lithium reacts with water to form lithium hydroxide and hydrogen gas.

Complete solution step by step:
-Lithium is alkali metal and belongs to group 1 of periodic table.
-lithium is a block element as the last electron enters s orbital. Lithium is alkali metal as it reacts with water to form hydroxides.
-Lithium exhibits anomalous behavior due to its exceptionally small size and high charge to radius ratio.
-lithium is least reactive among all alkali metals.
-lithium has a density of 0.534 g/centimeter cube. Water has a density as 1g/centimeter cube.
-it has least density among all elements that are solid at room temperature.
-lithium’s density is half the density of water, so it floats on water as less dense material floats on denser material.
-Lithium reacts with water while floating to form a colorless solution of lithium hydroxide and hydrogen gas. Hydrogen gas is highly inflammable.
-hence, “Lithium is the only metal which floats on water without any apparent reaction with it.”

This statement is false, 0.

Note: Alkali metals react vigorously with water to form metal hydroxide and hydrogen gas. Lithium reacts less vigorously than sodium and potassium, sodium and potassium are also lighter than water and reacts with water explosively. -lithium is least reactive among all alkali metals.