Which of the following is not an isotope of hydrogen?
The gases used in different types of welding would include
The hardest substance available on earth is
Permanent hardness of water may be removed by the addition of
Actinides are the elements with atomic numbers from
Which of the following metals remain in liquid for under normal conditions?
Which of the following is in liquid form at room temperature?
Galvanised iron sheets have a coating of
In fireworks, the green flame is produced because of
Chemical formula for water is
The main constituents of pearls are
The property of a substance to absorb moisture from the air on exposure is called
Production of chlorofluorocarbons (CFC) gas which is proposed to be banned in India, is used in which of the following domestic products?
The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of
The variety of coal in which the deposit contains recognisable traces of the original plant material is
Soda water contains
The two elements that are frequently used for making transistors are
Potassium Permanganate is used for purifying drinking water, because
Sodium metal is kept under
Among the various allotropes of carbon,
Permanent hardness of water can be removed by adding
The gas usually filled in the electric bulb is
Amalgams are
In which of the following activities silicon carbide is used?
Balloons are filled with
Which of the following does not contain a coinage metal?
The element common to all acids is
Tetraethyl lead is used as
The most important ore of aluminium is
The filament of an electric bulb is made of
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