SSLC (English Medium) कक्षा ९ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Science

The tendency of atoms to have eight electrons in the outer shell is known as ______.

Oxidizing agents are otherwise called ______.

The tarnishing of metals is due to the formation of ______.

The tarnishing of metals is an example of ______ reaction.

The sum of the oxidation number of all atoms in a compound is ______.

______ is a metal that has a high resistance to corrosion.

Choose the odd one out and write the reason:

Choose the odd one out and write the reason:

Identify the following reactions as oxidation/reduction/redox reaction

Zn + CuSO₄ → Cu + ZnSO₄

Identify the following reactions as oxidation/reduction/redox reaction

CuO+H₂ → Cu+H₂O

Identify the following reactions as oxidation/reduction/redox reaction

2Mg +O₂ → 2MgO

What are reducing agents? Give examples.

What are redox reactions? Give examples.

What is rancidity?

Define oxidation number.

Find the oxidation number of the element in the following compound.

Zn in ZnSO₄

Find the oxidation number of the element in the following compound.

Ca in CaH₂

Find the oxidation number of the element in the following compound.

Mg in MgO

Find the oxidation number of the element in the following compound.

N in NH₃

Find the oxidation number of the element in the following compound.

A1 in AlCl₃