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

The basis of the classifications proposed by Dobereiner, Newlands and Mendeleev was ______.

Example for liquid metal is ______.

State whether true or false. If false, correct the statement.

Metals can gain electrons.

Number of valence electrons in carbon is ______.

Sodium having atomic number 11, is ready to ______ electron/ electrons to attain the nearest noble gas electronic configuration.

The element that would form anion by gaining electrons in a chemical reaction is ______.

Elements with stable electronic configurations have eight electrons in their valence shell. They are ______.

How do atoms attain Noble gas electronic configuration?

Explain Octet rule with an example.

Complete the table give below.

Draw the electron distribution diagram for the formation of Carbon di oxide (CO2 ) molecule.

An atom X with atomic number 20 combines with atom Y with atomic number 8. Draw the dot structure for the formation of the molecule XY.

Why are Noble gases inert in nature?

Zn + 2 HCl → ZnCl₂ +_____↑

Since metal carbonate and metal bicarbonate are basic, they react with acids to give salt and water with the liberation of ______.

Classify the various types of Acids based on their sources.

Two acids ‘A’ and ‘B’ are given. Acid A gives one hydrogen ion per molecule of the acid in solution. Acid B gives two hydrogen ions per molecule of the acid in solution.

1. Find out acid A and acid B.
2. Which acid is called the King of Chemicals?

Compounds with same molecular formula and different structural formula are known as ______.

Match the following.

Higher Order Thinking Skill.

Why do carbon exist mostly in combined state?