Composition of Matter — Science STD 8 — Question

What is the angle of reflection?
OR
Define angle of reflection.

Classify the following into homogeneous solution and heterogeneous solution?
Soda water, potassium permanganate solution, milk, alcohol in water, ink solution, wheat flour in water.

The label on the bottle of chemical is spoiled. How will you find whether the chemical is acidic or not?

Element with valency 2.(Give Two Example)

Write the electronic configuration of oxygen.

State two metals which can be cut easily with a knife.

Which is the most common and effective solution for extinguishing fire ?

What are the constituents of stainless steel?

Classify the following compounds into organic compounds, inorganic compounds and complex compounds.
Petrol, common salt, haemoglobin, blue vitriol, cyanocobalamine, cooking gas.

The atomic mass number of chlorine is 35.