Control and Coordination — Science STD 10 — Question

If someone is suffering from the problem of acidity after overeating, which of the following would you suggest as remedy?
Lemon juice, Vinegar, Baking soda solution Give reason for your choice.

Giving an example list two information which make a chemical equation more useful (informative).

What is the number of elements in:

1. 1st period, and
2. 3rd period, of the modern periodic table?

Define ignition temperature of a fuel.

What is the general name of the substances having infinitely high electrical resistance?

What happens to the number of valence electrons in the atoms of elements as we go down in a group of the periodic table?

By what other name is the unit joule/ coulomb called?

What is nichrome? State its one use.

Which metal is extracted from calamine ore?

Why is the flow of signals in a synapse from axonal end of one neuron to dendritic end of another neuron but not the reverse?