The alkali metals form salt-like hydrides by | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) The thermal stability of alkali metal hydrides depends on the strength of the $M-H$ bond.As we move down the group from $Li$ to $Cs$,the size of t

Vedclass · Accepted Answer

$LiH > NaH > KH > RbH > CsH$

Vedclass · Answer

(D) The thermal stability of alkali metal hydrides depends on the strength of the $M-H$ bond.As we move down the group from $Li$ to $Cs$,the size of the alkali metal cation increases.This increase in size leads to a decrease in the overlap between the metal orbital and the hydrogen $1s$ orbital,making the $M-H$ bond weaker.Therefore,the thermal stability decreases as the size of the metal increases.The correct order of stability is $LiH > NaH > KH > RbH > CsH$.Thus,option $(D)$ is the correct answer.

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

Similar Questions

The centre of mass of three particles of masses $1 ~kg, 2 ~kg$ and $3 ~kg$ is at $(2,2,2)$. The position of the fourth mass of $4 ~kg$ to be placed in the system so that the new centre of mass is at $(0,0,0)$ is:

What is meant by $Tin \ Cry$?

Secondary sewage treatment is mainly a

Fungi are always...

If $f(x) = \begin{cases} \frac{\sin(1+[x])}{[x]}, & \text{for } [x] \neq 0 \\ 0, & \text{for } [x] = 0 \end{cases}$ where $[x]$ denotes the greatest integer not exceeding $x$,then $\lim_{x \rightarrow 0^{-}} f(x)$ is equal to

Vedclass Test Series

Exam Paper Generator

Online Exam Module