Periodic Classification of Elements — Science STD 10 — Question

Name two fruit trees which are usually propagated by grafting method.

What is the molecular formula and structure of the alcohol which can be thought to be derived from pentane ?

Define the principal focus of a concave lens.

What would be the electron dot structure of a molecule of sulphur which is made up of eight atoms of sulphur? (Hint - The eight atoms of sulphur are joined together in the form of a ring.)

What is the genotype of.

1. Dwarf plants, and
2. Tall plants, whose parental cross always produces tall offspring?

Which one has the bigger size?
Na(11) or Cl(17); Cl(17) or F(9)

You are given the magnetic field pattern of a magnet. How will you find out from it where the magnetic field is the strongest?

Identify the type of chemical reaction taking place in the following:
Barium chloride solution is mixed with a copper sulphate solution and a white precipitate is observed.

The electrolysis of an aqueous solution of sodium chloride gives us three products. Name them.