Why does the thermal stability of hydrides of group 16 decreases down the group?

Answer: The thermal stability of the hydrides of group 16 elements decreases down the group, i.e., H2O > H2S > H2Se > H2Te > H2Po. This is because M-H bond dissociation energy decreases down the group with the increase in the size of central atom.

Why does thermal stability decrease down group 17?

Since H-X bond is more easily broken down the group, thermal stability of the halogen halide decreases.

What is the stability of hydride?

Small anion forms a stable compound with small cation.

Why does the melting point of hydrides increase down the group?

For hydrides of group 16, the boiling point and melting point definitely increases down the group as molecular mass increases. But then, water has an exceptionally high boiling point due to the presence of stronger intermolecular hydrogen bonding between the water molecules.

Why does the hydrides decrease down the group 15?

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.

Why thermal stability increases down the group?

As the positive ions get larger down the group, they affect on the carbonate ions near them less. More heat must be supplied for the carbon dioxide to leave the metal oxide. In other words, the carbonates become more thermally stable down the group.

Why does thermal stability increase down group 2?

The thermal stability increases as you go down Group 2. This is because the Group 2 ion has lower charge density, and thus distorts the carbonate ion less. The less distorted the carbonate ion is, the more stable it is, and so a higher temperature is required to decompose the carbonate.

Why does the stability of carbonates increase down the group?

All the carbonates in this group undergo thermal decomposition to the metal oxide and carbon dioxide gas. Down the group, the carbonates require more heating to decompose. The carbonates become more thermally stable down the group.

Why is bih3 a strong reducing agent?

The nitrogen hydride is more stable and bismuth hydride is least stable. Due to the least stability of bismuth hydride, it is the strongest reducing agent among all the hydrides of group \[15\] elements.

Why does boiling point increase down a group?

Melting and Boiling Points (increases down the group) The melting and boiling points increase down the group because of the van der Waals forces. The size of the molecules increases down the group. This increase in size means an increase in the strength of the van der Waals forces.

Why stability increases down the group?

The effect of heat on the Group 2 carbonates The term “thermal decomposition” describes splitting up a compound by heating it. Down the group, the carbonates require more heating to decompose. The carbonates become more thermally stable down the group.

Why does the reducing character of hydrides increase from top to bottom?

The reducing character of hydrides of group 15 elements increases from top to bottom because the E-H strength (Here E= N, P, As, Sb, or Br) bond decreases down the group due to an increase in the size of the central atom.

Why are hydrides more electronegative down the group?

This is due to the fact size of atom increases down the group which leads to weaker interaction between atoms and its hydride leading to decrease in stability down the group. Hydrides are the compounds of hydrogen with other element may be more electronegative or less electronegative than hydrogen.

Why does the stability of hydrides decrease from ammonia to bismuthine?

The stability of hydrides decreases from ammonia to bismuthine. This is because the central atom E increases in size down the group. With the increase in the size of the central atom, the E – H bond becomes weaker. where E is nitrogen ,phosphorus, arsenic,antimony , bismuth.

How does solubility change down the group of an element?

As the size of the element increses the solubility decreases. Also the stability of the elements decreases down the group,as the size of the central atom increases the bonding with the hydrides becomes weaker and hence the solubility also decreses.