Chemistry
Assertion (A): Electrovalent compounds conduct electricity even in solid state.
Reason (R): Electrovalent compounds are composed of ions.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Chemical Bonding
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Answer
A is false but R is true.
Explanation — Electrovalent compounds cannot disssociate into ions in solid state hence they do not conduct electricity but they are very good conductors of electricity in the molten or in aqueous state. Hence the Assertion (A) is false.
Electrovalent compounds are composed of ions that are held by strong electrostatic force of attraction, which cannot be seperated easily. Hence Reason (R) is true.
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Related Questions
Assertion (A): Ionic compounds conduct electricity in molten or aqueous state.
Reason (R): Ionic compounds consist of molecules.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): A pair of electrons not shared with any other atom is known as a lone pair.
Reason (R): Ammonium ion has a lone pair.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Fill in the blanks by selecting the correct word from the brackets :
(a) When the nuclei of two different reacting atoms are of …………… mass, then a bond so formed is called …………… covalent bond (equal, unequal, polar, non-polar).
(b) In case of non-polar covalent bond, the covalent bond is formed in the …………… of atoms and shared electrons are distributed (corner, middle, equally, unequally).
(c) Ionic or electrovalent compounds do not conduct electricity in their …………… state (fused/solid).
(d) The ions in …………… compounds are held very strongly due to strong …………… forces (electrovalent, covalent, electromagnetic, electrostatic).
(e) In covalent compounds, the bond is formed due to …………… [sharing/transfer] of electrons.
(f) Electrovalent compounds have a …………… [low/high] boiling point.
Give one word or phrase for the following :
(a) Formation of ions from molecules.
(b) A bond formed by a shared pair of electrons with both electrons coming from the same atom.
(c) A bond formed by a shared pair of electrons, each bonding atom contributing one electron to the pair.