Electrovalent Bonding Of Metals Test - Class 10 MCQ

An electrovalent bond is formed when a metal atom transfers one or more electrons to a non metal atom and these compounds are called ionic compounds.

The ions present in NaCl is one ion of Na and one ion of Cl. So, option ( c) is the correct one.

We know phosphorus has atomic no. 15. Therefore it's electronic configuration is :- 2,8,5 , which means 2 electrons  in k- shell, 8 electrons in L-shell and 5 electrons in M - shell.

Ionic compounds have high boiling and melting points as they're very strong and require a lot of energy to break. 

Magnesium has electronic configuration 2,8,2 . It loses 2 electrons to complete octet configuration in its valence shell. Chlorine has electronic configuration 2,8,7 . It gains 1 electron to complete octet configuration in its valence shell. 

Atomic number of sodium is 11 so its electronic configuration will be 2, 8, 1. But sodium ion is formed by the loss of an electron so its electronic configuration is 2, 8.

Water is a polar covalent compound. It decreases the electrostatic forces of attraction,resulting in free ions in aqueous solution. Hence ionic compounds disslove in water. Kerosene is a non polar organic solvent and dissolves non polar covalent compounds.

Potassium Chloride is an excellent water soluble crystalline Potassium source for uses compatible with chlorides.. Chloride compounds can conduct electricity when fused or dissolved in water. Chloride materials can be decomposed by electrolysis to chlorine gas and the metal.

Solid NaCl does not conduct electricity due to absence of free ions.