SSLC (English Medium) Class 9 - Tamil Nadu Board of Secondary Education Question Bank Solutions

Explain the following effects of heat.

Expansion

How is matter classified?

Gold foil alpha particle scattering experiment was performed by ______.

In Rutherford’s experiment, the bouncing of alpha particles suggests that the nucleus of an atom is negatively charged.

Rutherford’s model of an atom has a very small ______ at the center.

What is the correct procedure for mixing acid and water? Why?

“All acids contain one or more hydrogen atoms, but not all substances containing hydrogen are acids.” Support this statement with examples.

______ & ______ metals do not react with HCl or HNO₃.

The formula of bleaching powder is  ______.

The taste of acid is ______.

Write notes on the properties of acids.

Carbon has the tendency to lose its four electrons with that of other atoms to complete its octet.

Write the applications of Nanochemistry.

Nanoparticles are unstable when they come in contact with ______.

Which is the incorrect statement in the following?

Nanotechnology deals with materials that are smaller than ______.

The metallic nanoparticles can be used as ______.

Nanoparticle substances are incorporated into fabrics to prevent ______.

Nanoparticles are easy to synthesize, isolate, and apply.

Assertion (A): Nanoparticles interact with impurities.
Reason (R): Nanoparticles are less reactive.