Explanation

Tin has the lowest melting point (~232°C) among.

• Zinc (~419°C)
• Gold (~1064°C)
• Lead (~327°C)

Explanation

Neutron is a neutral particle, meaning it has no electric charge.

Because of this, it didn't respond to electric or magnetic fields, making its detection difficult and late compared to protons and electrons.

Explanation

Fluorine (F) is the most reactive nonmetal and the most electronegative element.

It reacts violently with almost all elements (e.g., water, metals, glass).

Explanation

 The precise definition of organic chemistry is the Study of carbon-containing compounds. 

Organic chemistry focuses on the study of compounds that contain carbon, regardless of whether they are hydrocarbons or their derivatives.

While hydrocarbons are a subset of organic compounds, the definition encompasses all carbon-based molecules

Explanation

Most catalytic elements or their compounds belong to the d-block. 

d-block elements (transition metals):

These elements are known for their ability to participate in a wide variety of chemical reactions due to the availability of their d-orbitals. This allows them to act as catalysts by facilitating the formation of intermediate compounds and lowering the activation energy of reactions. 

Explanation

Alkaline earth metals: These elements have two valence electrons in their outermost s orbital.

3rd period: In the third period, the outermost shell is the 3rd shell. 

Therefore, the electronic configuration of an alkaline earth metal in the 3rd period is [Ne] 3s².

Explanation

With an increase in the number of unpaired electrons, paramagnetism increases. 

Paramagnetism is directly related to the presence of unpaired electrons.

More unpaired electrons mean a stronger magnetic field, hence a greater degree of paramagnetism. 

Explanation

Secondary cells are rechargeable, meaning they can be recharged and used multiple times, unlike non-rechargeable primary cells. 

Explanation

Enthalpy of hydration:

This term refers to the energy change when one mole of gaseous ions dissolves in water to form an infinitely dilute solution, meaning the ions are completely surrounded by water molecules

Explanation

 The enthalpy change during the formation of one mole of a compound from its elements in their standard states is called standard heat of formation.