Q.1
When quick lime is added to water
Q.2
A balloon filled with helium rises in air because
Q.3
Which one is a naturally occuring noble gas?
Q.4
Total number of naturally occurring elements
Q.5
Hydrogen is not found in atmosphere because
Q.6
What is the element required for solar energy conversion ?
Q.7
Water is not effective in extinguishing a fire caused by petrol because
Q.8
The temperature of oxy-acetylene flame is around
Q.9
Rock salt is a mineral containing
Q.10
Piped Natural Gas (PNG) is used for
Q.11
Petroleum consists of a mixture of
Q.12
The components of water can be separated by
Q.13
Which one is a soluble salt in H2O?
Q.14
Chemical name of common salt is
Q.15
The quality of petrol is expressed in terms of
Q.16
The gas that usually causes explosions in coal mines is
Q.17
Thermal electricity is generated by using which of these ?
Q.18
The charcoal used to decolourise brown sugar solution is
Q.19
The major component in the LPG is
Q.20
The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is:
Q.21
The chemical formula of the laughing gas is
Q.22
The common name for the compound having formal NaOH is
Q.23
What is the element that is in the highest percentage in the composition of the earth ?
Q.24
Which one of the following is also known as solution ?
Q.25
The coloured discharge tubes for advertisement mainly contain
Q.26
Helium gas is used in gas balloons instead of hydrogen gas because it is
Q.27
Baking soda is :
Q.28
Sodium Carbonate is commonly known as
Q.29
Brine refers to :
Q.30
White coal is
Q.31
Which of the following is not a chemical reaction?
Q.32
Chemical formula of washing soda is
Q.33
Vinegar is ________ .
Q.34
pH value between 6.5-7.5 makes the soil
Q.35
Nitrogen forms a variety of compounds in all oxidation states ranging from
Q.36
What is the covalency of nitrogen in ammonia molecule
Q.37
Which of the following type of coal has the lowest proportion of volatile matter ?
Q.38
Sour taste of lemon is due to the presence of which of the following ?
Q.39
pH scale ranges from
Q.40
Which of these acids is not organic in origin?
Q.41
Match the sourc in Column B with the product of
Column A. (Product) Column B (Source)
A. Formic acid1. Lemon
B. Citric acid 2. Tamarind
C. Tartaric acid3. Ants
Q.42
A fertile soil is likely to have a pH of
Q.43
Submarines move under water. They have engines that run on
Q.44
Which is the highest quality of hard coal?
Q.45
In which of the following states maximum iron ore is found ?
Q.46
Which of the following is the major constituent of LPG?
Q.47
Which variety of coal contains recognisable traces of the original plant material ?
Q.48
Domestic cooking gas consists mostly of
Q.49
Philosopher’s wool is chemically
Q.50
What is the atomic number of Oxygen?
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