The hardest substance available on earth is
Platinum
Quartz
gold
Diamond
- The type of glass used in making prisms and lenses is
- The element present in the largest amount in rocks and minerals is
- Which of the following elements is obtained from sea weeds ?
- Water has maximum density at
- Polythene is industrially prepared by the polymerisation of
- The fastest acting enzyme in the biological kingdom is
- The metallic constituents of hard water are
- Pollination by birds is called
- The metal that is present in Photo Films is
- Bromine is
- The formula of Plaster of Paris is
- Glass is made from the mixture of
- According to Daltons atomic theory the smallest particle which can exist independently is
- Permanent hardness of water can be removed by adding
- Epoxy resins is used as
- The intencity of Earthquakes is measured on
- Which of the following is in liquid form at room temperature ?
- The chemial name of Uria is
- Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
- Nitrification means
- Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere…
- When a gas is turned into a liquid, the process is called
- Brass gets discoloured in air due to the presence of which gas in air
- The colour of Emerald is
- The most important ore of Aluminium is
- In an atomic nucleus, neutrons and protons are held together by
- The Panda belongs to the same family as that of
- Cell membrane is
- The major ingredient of leather is
- The oxide of Nitrogen used in medicine as anaesthetic is