Carbon and its Compounds — Science STD 10 — Question

Buckminsterfullerene is a spherical molecule in which 60 carbon atoms are arranged in interlocking hexagonal and pentagonal rings of carbon atoms.

1. How many hexagons of carbon atoms are present in one molecule of buckminsterfullerene?
2. How many pentagons of carbon atoms are present in one molecule of buckminsterfullerene?

State a peculiar (or remarkable) property of plaster of Paris.

What happens when ethanoic acid reacts with sodium hydroxide? Write equation of the reaction involved.

Which compound is used as an antacid in medicine: NaHCO₃ or Na₂CO₃?

In addition to some propane and ethane, LPG cylinders contain mainly two isomers of another alkane. Name the two isomers and write their condensed structural formulae.

With which substance should chlorine be treated to get bleaching powder?

Given alongside is a part of the periodic table:
As we move horizontally from left to right:

1. What happens to the metallic character of the elements?
2. What happens to the atomic size?

Two non-metals combine with by the sharing of electrons to form a compound X.
State whether X will have a high melting point or low melting point.

Name two catalysts which can be used in the hydrogenation of unsaturated compounds.

Two non-metals combine with by the sharing of electrons to form a compound X.
Will it dissolve in an organic solvent or not?