Question

Metals reacts with water to form $W.$
A) W= acidic oxide, carbon dioxide
B) W= basic oxide, heater
C) W= metal oxide, hydrogen
D W= metal hydroxide, oxygen

Answer 1

We must know that water is made up of two hydrogen atoms and an oxygen atom. It shows polarity and is found in liquid, solid and vapor states. It is a good solvent due to the presence of polarity and thus it is commonly known as the universal solvent. Metal reacts with water to form different compounds and different metals react differently.

Complete step-by-step answer:
When we talk about alkali metals we must know that it is their ability to displace ${H_2}\left( g \right)$ from water. They have large and negative electrode potentials. When we talk about alkali metals they are known to get oxidised to its metal ion and water is reduced to form hydrogen gas and hydroxide ions.

Equation to depict this is:
$2{\mkern 1mu} {\text{M}}({\text{s}}) + 2{\mkern 1mu} {\text{H}}_2^{\text{O}}({\text{l}}) \to 2{\mkern 1mu} {{\text{M}}^ + }({\text{aq}}) + 2{\mkern 1mu} {\text{O}}{{\text{H}}^ - }({\text{aq}}) + {H_2}\left( g \right)$

Thus we can see that Metals react with water to form a metal hydroxide or metal oxides and hydrogen gas.

In this reaction, $O{H^ - }$is produced which creates a basic environment in the solution. They have the ability to displace ${H_2}\left( g \right)$from water and create a basic solution. Alkali metals are also known to react violently and explosively with water. This is because enough heat is given off during the exothermic reaction to ignite the ${H_2}\left( g \right)$. Alkali metals react with oxygen to form monoxides, peroxides, or superoxides.

Hence the correct answer is option ‘C’.

Note: The properties of metals include them being solid at room temperature except mercury. Mercury is a liquid metal at room temperature. Metals have property to reflect light from their surface. This is because they can be polished. They are able to withstand hammering and thus they can be beaten into thin sheets which are called foils. Metals are also known to be ductile and thus can be drawn into wires.