The alkali metals form salt-like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrieds decreases in which of the following orders?

CsH > RbH > KH > NaH >LiH

KH > NaH> LiH > CsH >RbH

NaH > LiH >KH> RbH> CsH

LiH > NaH > KH >RbH >CsH

Solution

LiH > NaH > KH >RbH >CsH

Small anion forms stable compounds with small cation.
The thermal stability of alkali metal hydrides decreases as:
LiH> NaH > KH > RbH >CsH
because the size of cation increases as;
Li⁺ < Na⁺ < K⁺ < Rb⁺ <Cs⁺

Some More Questions From The s-Block Elements Chapter

Lithium has highest ionisation energy in group 1 elements, yet it is strongest reducing agent. Comment.

The softness of group 1 elements increases down the group with increasing atomic number. Give reason.

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The S-Block Elements

The alkali metals form salt-like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrieds decreases in which of the following orders?

CsH > RbH > KH > NaH >LiH

KH > NaH> LiH > CsH >RbH

NaH > LiH >KH> RbH> CsH

LiH > NaH > KH >RbH >CsH

Some More Questions From The s-Block Elements Chapter

Lithium has highest ionisation energy in group 1 elements, yet it is strongest reducing agent. Comment.

The softness of group 1 elements increases down the group with increasing atomic number. Give reason.

Which is the most reactive alkali metal and why?

Why alkali metals do not form M²⁺ions?

Name the radio active element in group 1. How does it resemble with the remaining elements of the group?

Why alkali metals are normally kept in kerosene oil?

Why lithium cannot be stored in kerosene?

Why does lithium form complexes?

Why are alkali metal ions diamagnetic and colourless?

Why are alkali metals the most electropositive in nature?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

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For Daily Free Study Material Join wiredfaculty

The S-Block Elements

The alkali metals form salt-like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrieds decreases in which of the following orders? CsH > RbH > KH > NaH >LiH KH > NaH> LiH > CsH >RbH NaH > LiH >KH> RbH> CsH LiH > NaH > KH >RbH >CsH

Some More Questions From The s-Block Elements Chapter

Lithium has highest ionisation energy in group 1 elements, yet it is strongest reducing agent. Comment.

The softness of group 1 elements increases down the group with increasing atomic number. Give reason.

Which is the most reactive alkali metal and why?

Why alkali metals do not form M2+ ions?

Name the radio active element in group 1. How does it resemble with the remaining elements of the group?

Why alkali metals are normally kept in kerosene oil?

Why lithium cannot be stored in kerosene?

Why does lithium form complexes?

Why are alkali metal ions diamagnetic and colourless?

Why are alkali metals the most electropositive in nature?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

The alkali metals form salt-like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrieds decreases in which of the following orders?

CsH > RbH > KH > NaH >LiH

KH > NaH> LiH > CsH >RbH

NaH > LiH >KH> RbH> CsH

LiH > NaH > KH >RbH >CsH

Why alkali metals do not form M²⁺ions?