Which one of the following is a characteristic of a metal? A. reacts with bases to produce salts...

Question:

Which one of the following is a characteristic of a metal?

A. reacts with bases to produce salts

B. changes the color of litmus paper to red

C. becomes negative when combined with other elements

Metal

Metals are the elements, which are hard, good conductor of electricity, ductile in nature. The metals combine with each other to form alloys. Metals are thus, used in production of many instruments.

The option A states that the metal reacts with bases to produce salts.

Example- {eq}{\rm{2NaOH(aq)}} + {\rm{Zn(s)}} \to {\rm{N}}{{\rm{a}}_{\rm{2}}}{\rm{Zn}}{{\rm{O}}_{\rm{2}}}{\rm{(aq)}} + {{\rm{H}}_{\rm{2}}}{\rm{(g)}} {/eq}

In this reaction, two molecule of sodium hydroxide reacts with one molecule of zinc metal to give one molecule of sodium zincate (salt) and one molecule of hydrogen gas.

Therefore, this option is a characteristic of metal.

The option B states that the metal changes the color of litmus paper to red.

The metals are neither acid nor base. So, they cannot change the color of litmus paper.

Therefore, this option is not the characteristic of metal.

The option C states that the metal becomes negative when combined with other elements.

For an example- {eq}{\rm{Zn(s)}} + 2{\rm{HCl(aq)}} \to {\rm{ZnC}}{{\rm{l}}_{\rm{2}}}{\rm{(aq)}} + {{\rm{H}}_{\rm{2}}}{\rm{(g)}} {/eq}

In this reaction, one molecule of zinc metal reacts with two molecules of hydrochloric acid to give one molecule of zinc chloride and one molecule of hydrogen gas.

Therefore, this option is not the characteristic of metal.

The option D states that the metals conduct heat readily.

The metals show high conductivity in heat and electricity both.

Therefore, it is a characteristic of metal.

Metals on the Periodic Table: Definition & Reactivity

from General Studies Science: Help & Review

Chapter 27 / Lesson 45
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