General Chemistry

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1 Which is abundant in Gobar gas?

A
Carbon dioxide
B
Methane
C
Oxygen
D
Hydrogen

2 Setting of plaster of paris involves

A
dehydration process
B
hydration to form other hydrates
C
oxidation process
D
reduction process

3 Helium gas is filled in ballons because

A
its atomic number is 2
B
it is lighter than air
C
it is one of the constitutents of water
D
it is a noble gas

4 Which of the following elements is non-radioactive ?

A
Uranium
B
Thorium
C
Plutonium
D
Zirconium

5 The pH of human blood is between :

A
6.5-7
B
7.5-8
C
8-9
D
4.5-5

6 Which of the following fibres catches fire least ?

A
Nylon
B
Cotton
C
Rayon
D
Terricot

7 Stainless steel is usually made by alloying the steel with

A
copper and nickel
B
copper and chromium
C
chromium and nickel
D
manganese and copper

8 Detergents used for cleaning clothes and utensils contain :

A
nitrates
B
bicarbonates
C
sulphonates
D
bismuthates

9 Which variety of coal contains recognisable traces of the original plant material ?

A
Anthracite
B
Lignite
C
Peat
D
Bitumen

10 The metal chiefly used for galvanising iron is :

A
Zinc
B
Mercury
C
Cadmium
D
Tin

11 Baking soda is :

A
Potassium carbonate
B
Sodium hydroxide
C
Sodium carbonate
D
Sodium bicarbonate

12 Among the following the hardest metal is :

A
Gold
B
Iron
C
Platinum
D
Tungsten

13 The metal extracted from Bauxite is :

A
Silver
B
Copper
C
Manganese
D
Aluminum

14 What is the most common salt in sea water ?

A
Calcium carbonate
B
Potassium chloride
C
Sodium chloride
D
Magnesium sulphate

15 The depletion of ozone layer is due to :

A
chloro fluoro carbon
B
carbon dioxide
C
sulphur dioxide
D
ethane