Question:

${AgNO_3}$ does not decompose where :

CBSE CLASS XII

Updated On: Jun 14, 2023

U.V. radiation
Skin (human)
Water $25^ \circ C$
Glucose

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The Correct Option is C

Solution and Explanation

${AgNO_3 -> Ag}$ not decompose by ${H2O}$ at room temp. but reduce to silver in presence of light and
reducing agent like glucose

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Notes on d block elements

Concepts Used:

d block elements

The elements, in the columns of the periodic table in which d subshells are being occupied are known as d block elements.

These are the elements that have the capability of forming stable cations with incompletely filled d orbitals. Elements like mercury and Zinc are not considered transition metals because they have electronic configurations: (n-1)d¹⁰ ns². These elements have filled d-orbitals in their ground state and, therefore, even in some of their oxidation states.

General Properties Of d-Block Elements

Multiple oxidation states- The oxidation states of d block elements show very few energy gaps; therefore, they exhibit many oxidation states. Also, the energy difference between s and d orbital is very less. Therefore both the electrons are involved in ionic and covalent bond formation, which ultimately leads to multiple oxidation states.
Formation of complex compounds- Ligands show a binding behaviour and can form so many stable complexes with the help of transition metals. This property is mainly due to:
- Availability of vacant d orbitals.
- Comparatively small sizes of metals.
Hardness- Transition elements are tough and have high densities because of the presence of unpaired electrons.
Melting and boiling points- Melting and boiling points of transition are very high. This is because of the presence of unpaired electrons and partially filled d orbitals. Because of these two things, they form strong bonds and therefore have high melting and boiling points.
Atomic radii- The atomic and ionic radius of the transition elements decreases as we move from Group 3 to group 6. However, it remains the same between group 7 and group 10, and from group 11 to group 12 increases.
Ionization enthalpy- The ionization enthalpies of the transition elements are generally on the greater side as compared to the S block elements