P-2 Life Processes in Living Organisms Part – 2 — Science STD 10 — Question

Name two physical properties each of sodium and carbon in which their behaviour is not as expected from their classification as metal and non-metal respectively.

Give reason for the following:
Carbonate and sulphide ores are usually converted into oxides during the process of extraction of metals.

When a magnesium ribbon is heated, it burns in air to form magnesium oxide. Write a balanced chemical equation for this reaction. Name:

1. Substance oxidised, and
2. Substance reduced.

A ray of light is incident on a plane mirror at an angle of 30°. What is the angle of reflection?

Write down the formula which relates electric charge, time and electric current.

Name the material which is used for making the filaments of an electric bulb.

What is the name of tiny air - sacs at the end of smallest bronchioles in the lungs?

All chromosomes are arranged parallel to equatorial plane of cell in …………. phase of mitosis.

What is the IUPAC name of acetic acid?

Name an alloy of copper. State its chemical composition and any one use.