What do all acids and all bases have common? Explain.

All three classes of aliphatic amines are stronger bases tha ammonia. Explain.

How do acids and bases, react with each other. Explain with example.

Consider the following statements: A- Both acids and bases change colour of all indicators. B-If an indicator gives a colour change with an acid, it does not give a change with a base. C- If an indicator changes colour with a base, it does not change colour with an acid. D-Change of colour in an acid and a base depends on the type of the indicator. Which of these statements are correct?

What are acids and bases? Give two tests to distinguish these.

State whether true or false Adjacent angles have common arm, common vertex, interior do not overlap.

A plant species shows seceral morphological variations in response to altitudinal gradient. When grown under similar conditions of growth, the morphological variations disappear and all the variants have common morphology. What are these variants called?

What are acids and bases according, to Arrhenius concept ?

Do all the stars in the sky move? Explain.