Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
Sulphonates
Zeolites
Nitrates
None of these
- Glass is made from the mixture of
- The fastest acting enzyme in the biological kingdom is
- The speed of light with the rise in the temperature of the medium
- Polythene is industrially prepared by the polymerisation of
- The location and energy of an electron in an atom can be specified by
- What is the unit for measuring the pitch or frequency of sound ?
- Earth's seasons are caused by which of the following?
- The chemial name of Uria is
- Pollination by birds is called
- The smallest functional and structural unit of kidney is called as
- Which of the following is the lightest metal ?
- Which of the following parts of the sun is easily visible only during a total solar eclipse?
- The major ingredient of leather is
- Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere…
- One fathom is equal to
- The solar eclipse occurs when
- Which of the following elements is non-radioactive?
- Which of the following is commonly called a polyamide ?
- The marine animal called dugong which is vulnerable to extinction is a/an
- The metal used in storage batteries
- The intencity of Earthquakes is measured on
- The oxide of Nitrogen used in medicine as anaesthetic is
- Liquefied Petroleum gas (LPG) consists of mainly
- In an atomic nucleus, neutrons and protons are held together by
- Permanent hardness of water can be removed by adding
- The most important ore of Aluminium is
- The element present in the largest amount in rocks and minerals is
- Rust is
- Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
- The hardest substance available on earth is