Q.1
Percentage of carbon in steel ranges from
Q.2
Copper is refined by
Q.3
Brass is a
Q.4
Which of the following metals form an amalgam with other metals ?
Q.5
The acid which is secreted by the glands in the stomach wall is
Q.6
Hydrochloric acid is also known as
Q.7
The most pure form of Carbon among the options is
Q.8
Carbon footprint can be reduced by
Q.9
Which of the following gases is most toxic ?
Q.10
Bauxite is an alloy of which of the following metals ?
Q.11
Hard steel contains
Q.12
When lime juice is dropped on baking soda, brisk effervescence takes place because the gas evolved is
Q.13
Sodium is produced by the electrolysis of
Q.14
The gas dissolved in water that makes it basic is :
Q.15
Which of the following is not a natural source of hydrocarbon?
Q.16
The element with highest first ionisation energy is
Q.17
Water gas is the mixture of
Q.18
In electro-refining, the pure metal is deposited on
Q.19
The gas produced in marshy places due to decomposition of vegetation is
Q.20
Among the following iron ores, the highest percentage of iron content is found in–
Q.21
The gas used for artificial fruit ripening of green fruit is –
Q.22
Brass is an alloy of
Q.23
________ gives hardness to stainless steel.
Q.24
Heating of a ore below its melting point in the absence of air is known as
Q.25
Why is water not suitable for putting out a petrol fire ?
Q.26
The chemical(s) most commonly used for cloud seeding or ‘artificial rainmaking’ is/are
Q.27
Which of the following is used as a lubricant in heavy machines?
Q.28
Which of the following is used as filler in tyre of rubber ?
Q.29
The open "Sigrees" or coal stoves often require fanning to sustain burning because of
Q.30
Bleaching powder is prepared by passing :
Q.31
Which of the following acts as promoter for iron in Haber's process?
Q.32
One property of ammonia is
Q.33
In a period from Li to F, ionisation potential
Q.34
Which of the following electrodes is used in strongly alkaline solution?
Q.35
Organic compounds are
Q.36
Vinegar is an aqueous solution of
Q.37
Gold dissolves in
Q.38
What is the mass percentage of oxygen in carbon dioxide (CO2)?
Q.39
Commercial nitric acid is coloured because it contains dissolved :
Q.40
The natural source of hydrocarbon is
Q.41
By which organic compound all the oils are known ?
Q.42
Brass is an alloy of :
Q.43
Stainless steel is usually made by alloying the steel with
Q.44
24 carat of diamond is equal to
Q.45
1 carat of diamond is equal to
Q.46
Which one of the following is used for dating very old objects of archaeological importance?
Q.47
In the periodic table of elements, on moving from left to right across a period, the atomic radius
Q.48
For a spontaneous chemical process, the free energy change is
Q.49
Two elements which can form a large number of compounds are
Q.50
Nitric acid does not react with
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