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

Give an example for each of the following statement.

Formation of coordinate covalent bond between NH₃ ➝ BF₃ molecules

Give an example for each of the following statement.

A compound in which three covalent bonds are formed.

Identify the incorrect statement and correct them.

1. Like covalent compounds, coordinate compounds also contain charged particles (ions). So they are good conductors of electricity. 
2. Ionic bond is a weak bond when compared to Hydrogen bond.
3. Ionic or electrovalent bonds are formed by mutual sharing of electrons between atoms. 
4. Loss of electrons is called Oxidation and gain of electron is called Reduction.
5. The electrons which are not involved in bonding are called valence electrons.

Discuss in brief about the properties of coordinate covalent compounds.

What are the various uses of Aquaregia.

Define aquaregia.

A phenomenon in which an element exists in different modification in same physical state is called ______.

Carbon forms large number of organic compounds due to ______.

______ is a suitable solven for sulphur.

Differentiate graphite and diamond

Define Allotrophy

Which of the following is not a salivary gland?

Define the following.

Prions

Mention any two mushroom preservation methods.

Define Mushroom culture. Explain the mushroom cultivation methods.

The human lung is well adapted to breathe at a pressure of ______ k Pa.

The air pressure at sea level is referred to as ______.

Tyre pressure of 30psi is almost ______ the atmospheric pressure.

What is referred to as atmospheric pressure?

Why do Scuba divers wear special suits and equipment?