Q.1
The names of the scientists, Newlands, Mendeleev, and Meyer are associated with the development of
Q.2
The mass number of an atom is equal to
Q.3
The maximum number of covalent formed by nitrogen is
Q.4
________ is a by product of sewage treatment and can be decomposed to produce biogas
Q.5
Water can be separated from alcohol water mixture by
Q.6
The gas used to dilute oxygen for breathing by deep sea divers is:
Q.7
The National Chemical Laboratory (India) is located in
Q.8
An oxidising agent is a
Q.9
Silver gets corroded due to ________ in air.
Q.10
Which among the following is used to dilute oxygen in the gas cylinders used by divers ?
Q.11
Copper substances when exposed to air gains a green coating due to the formation of:
Q.12
The gas that is used in the manufacture of vanaspati ghee is :
Q.13
Which one of the following metals does not react with water to produce Hydrogen ?
Q.14
Element 106 was discovered by
Q.15
Sea water can be purified by the process of
Q.16
The percentage of oxygen in air is approximately
Q.17
The major constituent of air is
Q.18
Which of the following gases will effuse out of football bladder most quickly ?
Q.19
Name two elements that find wide application in transistor industry.
Q.20
The formula C6H5-CO-CH3 represents
Q.21
In addition to hydrogen, the other abundant element present on Sun’s surface is
Q.22
The most abundant element in the human body is
Q.23
The most abundant element in the earth’s atmosphere is
Q.24
Who is known as the 'father of modern chemistry'?
Q.25
Which of the following is the petroleum wax ?
Q.26
Petroleum is a mixture of
Q.27
Which of the following causes the rusting of iron?
a. Oxidation
b. Reduction
c. Chemical reaction with oxygen
d. Chemical reaction with CO2
Q.28
Photo-oxidation process is initiated by
Q.29
L.P.G. is mostly liquefied
Q.30
Browning of paper in old books is caused by
Q.31
Catalyst is a substance which
Q.32
The gas used for filling weather balloons is
Q.33
The most abundant element is
Q.34
A mixture of water and alcohol can be separated by
Q.35
The property of hydrogen which distinguishes it from alkali metals is
Q.36
Which one is the naturally occuring heaviest element?
Q.37
Which of the following will replace hydrogen from acids to form salts ?
Q.38
The most abundant element by number in the living system is :
Q.39
Select the one which is not a mixture :
Q.40
The hottest part of the gas flame is known as
Q.41
Which of the following contains high content of lead?
Q.42
Which one of the following is not coal variety?
Q.43
Which of the following is used to increase the anti-knocking property of petrol ?
Q.44
The chief source of naphthalene is
Q.45
Except mercury which is the other metal that is liquid at standard conditions for temperature and pressure?
Q.46
Cooking gas is a mixture of
Q.47
Indane gas is mixture of
Q.48
Iodine can be separated from a mixture of Iodine and Potassium Chloride by
Q.49
Which one of the following is known as the 'brown coal'?
Q.50
Chemical name of bleaching powder is :
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