Question

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

Solution

Correct option is

LiH > NaH > KH > RbH > CsH

As the size of alkali metal ion increases, lattice energy decreases and hence the stability of the corresponding metal hydride decreases.

SIMILAR QUESTIONS

Q1

The solubility of alkali metal hydroxide follows the order:

Q2

The label on a bottle of H2O2 solution reads as ’10 volume’. The concentration of H2O2 in percentage by volume is

Q3

Which of the following has the highest decomposition temperature?

Q4

Bleaching powder slowly loses its activity when it stands in air. This is due to

Q5

Chloride of an element gives natural solution in water. In the periodic table the element belongs to

Q6

Among the following compounds of cement which is present in the highest amount?

Q7

Sodium peroxide which is a yellow solid, when exposed to air becomes white due to the formation of

Q8

Which of the following on thermal decomposition yields a basic as well as an acidic oxide?

Q9

 

Choose the correct statement :

The reason for use of polyphosphates as water softening agents is, that

Q10

Lithium can not be stored in kerosene oil because