Why does the hydrides of group 15 decreases down the group?

The stability of hydrides decreases down the group from NH3 to BiH3. This is due to a decrease in their bond dissociation enthalpy. Stability decreases down the group as the bond dissociation energy decreases. Hence, the bond dissociation energy decreases down the group due to the increase in the central atom size.

How does the stability of 15th group metal hydrides varies down the group?

Explanation: Stability of the hydrides of group 15 decreases when we move down a group. This is because smaller is the size of central metal atom more stronger will be the overlapping taking place with the hydrogen atom.

Which hydride of group 15 is soluble in water?

NH3 is soluble in water whereas other hydrides of group-15 elements are insoluble in water.

Does solubility increases or decreases down the group?

On going down the group, the size of the cation increases and the salt becomes more ionic in nature. So, the solubility also increases down the group. Thus, the solubility of fluorides of alkali metals increases down the group.

Why does reducing character of hydrides increase down the group?

The reducing character increases down the group because ionisation energy decreases as we move down the group from O to Po.

Why is the strongest reducing agent among all the hydrides of group 15 elements?

Why is BiH3 the strongest reducing agent amongst all the hydrides of Groups 15 elements? Answer: Thus as we move down the group, the M—H bond can break more easily to evolve H2 gas which acts as the reducing agent. Thus, BiH2 is least stable among the hydrides of group 15 and hence is the strongest reducing agent.

Why does thermal stability decrease down group 15?

The electron density on the central atom decreases with the increase in the size of the central atom. Hence its ability to donate a pair of electrons decreases thus reducing the basic character. So, as the size of the central atom increases, the stability decreases. Thus the thermal stability decreases down the group.

Which one of the following group 15 hydrides is the strongest reducing agent?

BiH3
Doen the group (↓) i.e, from N to Bi, the atomic size increases, hence the bond length A-H increases consequently A-H bond strength decreases and tendency to behave as reducing agent increases i.e., BiH3 is the strongest reducing agent amongst all the hydrides of group 15 elements.

Why is nh3 water soluble but not other hydrides of 15th group?

Ammonia forms hydrogen bonds but phosphorus does not form hydrogen bonds with water as a result ammonia does dissolve in water.

Which group 15 hydrides has highest bond angle?

ammonia
Among group 15 hydrides, ammonia has the highest bond angle. The small sized nitrogen atom in ammonia has the highest electron density.

Why does solubility of sulphates decrease down the group?

Lattice energy as well as hydration energy values decrease with an increase in the size of ions and increases with an increase in charge of ions. It is because the hydration energy decreases down the group, the solubility of sulphates is also decreased down the group.

Why does the solubility of group 2 metals increase down the group?

Group II metal hydroxides become more soluble in water as you go down the column. This trend can be explained by the decrease in the lattice energy of the hydroxide salt and by the increase in the coordination number of the metal ion as you go down the column.

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