Rust is
A mixture of FeO and Fe(OH)2
A mixture of Fe2O3 and Fe(OH)2
A mixture of Fe2O3, 3H2O and FeO
FeO only
- What is the unit for measuring the pitch or frequency of sound ?
- Quartz crystals normally used in quartz clocks etc. is chemically
- Cell membrane is
- Brass gets discoloured in air due to the presence of which gas in air
- Glass is made from the mixture of
- The solar eclipse occurs when
- Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
- The smallest functional and structural unit of kidney is called as
- Old-written material, which cannot be read easily can be read by
- The oxide of Nitrogen used in medicine as anaesthetic is
- The element present in the largest amount in rocks and minerals is
- The fastest-running terrestrial animal is
- The metallic constituents of hard water are
- According to Daltons atomic theory the smallest particle which can exist independently is
- The hardest substance available on earth is
- The metal that is present in Photo Films is
- The recent atomic weight scale is based on
- Which of the following is the lightest metal ?
- Which of the following characters is not shown by hydrogen
- The intencity of Earthquakes is measured on
- The metal used in storage batteries
- Which of the following elements is obtained from sea weeds ?
- The chemial name of Uria is
- The type of glass used in making prisms and lenses is
- The speed of light with the rise in the temperature of the medium
- Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
- Nitrification means
- Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
- Permanent hardness of water can be removed by adding
- Rust is