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
- The location and energy of an electron in an atom can be specified by
- The metal used in storage batteries
- Which of the following characters is not shown by hydrogen
- The metallic constituents of hard water are
- Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
- Lightening cause rainfall because
- The recent atomic weight scale is based on
- The property of a substance to absorb moisture from the air on exposure is called
- Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
- The marine animal called dugong which is vulnerable to extinction is a/an
- The speed of light with the rise in the temperature of the medium
- Apparatus invented by Archimedes is :
- The type of glass used in making prisms and lenses is
- According to Daltons atomic theory the smallest particle which can exist independently is
- Old-written material, which cannot be read easily can be read by
- Water has maximum density at
- The fastest-running terrestrial animal is
- The hardest substance available on earth is
- When a gas is turned into a liquid, the process is called
- The intencity of Earthquakes is measured on
- Earth's seasons are caused by which of the following?
- The element present in the largest amount in rocks and minerals is
- The chemial name of Uria is
- The solar eclipse occurs when
- The major ingredient of leather is
- Nitrification means
- Permanent hardness of water can be removed by adding
- Which of the following elements is obtained from sea weeds ?
- The removal of top soil by water or wind is called
- Quartz crystals normally used in quartz clocks etc. is chemically