Periodic Table and Elements

This option is correct because silver chloride gives white precipitate when silver nitrate is dissolved in HCl. These precipitates are insoluble in nitric acid but dissolve in ammonium hydroxide.

Fluorine is the most electronegative element.

Br has the tendency to gain electrons. Br has 7 electrons in its outermost shell and by gaining one more electron, it can attain stability.

Electron affinity of elements increases on moving from left to right in the periodic table. Chlorine has highest electron affinity.

Alkali metals have greatest tendency to lose electrons. So potassium will have greatest tendency to lose electrons.

Fluorine is the most electronegative elements in the periodic table.

For isoelectronic ions, size decreases with increase in the atomic charge on the ion.

Copper is a transition element and transition elements show variable valencies.

Nitrogen has stable half filled p subshell. So it has the maximum value of first ionization energy.

La, Ce, Pr are the elements belonging to the Lanthanide series.

Sulfur has the highest negative value of electron gain enthalpy.

Cesium is an alkali metal which becomes liquid at 15⁰ C

Zinc's first ionisation energy is 906 kJ/mol. Zinc has a very high first ionisation enthalpy because an electron has to be removed from 4s orbital of stable configuration (3d¹⁰ 4s²).

Enthalpy of atomisation of manganese is 281 KJ / mol. Enthalpy of atomisation of zinc is 126 KJ / mol.

The atomic size of elements is Na < Mg < Ca < Cr < Sr. Ionisation potential ∝ 1/(Atomic Size) Na is the smallest atomic size. So, it has highest first ionisation potential.