Chemistry
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.
Chemical Bonding
4 Likes
Answer
A is true but R is false.
Explanation — The unshared pair of electrons is known as lone pair of electrons. Hence the Assertion (A) is true.
Ammonium molecule has lone pair of electrons NOT ammonium ion. Ammonium ion is formed when the lone pair of electron present on nitrogen atom in ammonium molecule is accepted by hydrogen ion and forms a coordinate bond. So, there are no lone pair of electrons left. Hence Reason (R) is false.
Answered By
4 Likes
Related Questions
Assertion (A): Atoms can combine either by the transfer of valence electrons from one atom to another or by sharing of valence electrons.
Reason (R): Sharing and transfer of valence electrons is done by atoms to have an octet in their valence shell.
- 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): 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): 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.
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.