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Which gas is used as fire extinguisher?
Which one of the following is extensively used for sterilizing water?
Which mixture of gases is mainly stored as a liquid under pressure in LPG cylinder?
The major constituent of air is
Which of the following organisms is most likely to produce greenhouse gases such as nitrous oxide and methane?
Rusting of iron takes place due to
The highest grade and best equality coal is
German silver used for making utensils is an alloy of
The purity of gold is expressed in carats. The purest form of gold is
Petroleum consists of a mixture of
The lustre of the metals is because of
One of the following is used to dissolve noble metals. That is
An emulsion is a colloid of a
Percentage of carbon in steel ranges from
Which of the following is not present in German-silver?
The major harmful gas emitted by automobile vehicles which causes air pollution is
Which one of the following is a major green house gas?
The chemical name of ‘Common salt’ is
Denatured spirit is ethanol mixed with
The metal, which is a constituent of vitamin B₁₂ is
The most abundant inert gas in the atmosphere is
Which metal is extracted from seawater?
Percentage of lead in lead pencils is
Helium has is used in gas balloons instead of hydrogen gas because it is
The gas used in the artificial ripening of fruits is
Ruby and sapphire are oxides of
The gas which turns into liquid at the lowest temperature among the following is
Gunpowder consists of a mixture of
Which of the following is the sweetest sugar?
In nuclear reactors, graphite is used as a/an
The process involved involved in making soap is
Sea water can be purified by the process of
The compound to which H₂ does not add is
Ammonal is a mixture of
Which gas does not form the part of atmosphere?
The fuel used in an atomic reactor is
The major constituent of gobar gas is
The isotope of Uranium used in atomic reactors is
Which one of the following is not a radio-active element?
The greenhouse effect is caused by the higher level of which gas in the atmosphere?
Candle is a mixture of
Ethanol containing 5% water is known as
Brass is an alloy of copper and
The density of a gas is maximum at
The important ore of aluminium is
Aqua regia is a 1 : 3 mixture, by volume, of
What is the maximum Water Vapour content in the atmosphere?
The amount of chlorine available in water after disinfection is called as
What are the major pollutants of cigarette smoke?
Zinc sulphide is commonly used as