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Chemistry

Chemistry
An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is

17
36
53
19

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Chemistry
Sulphur dioxide present in the industrial chimney exhaust causes

Reduction in plant's productivity owing to acid rain
Corrosion building materials
All of these
Respiratory and lung disease

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Chemistry
Periodic table contains how many groups

19
18
17
16

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Chemistry
Which of the following is used in welding broken pieces of iron rails and machine parts?

Aluminium powder
Aluminium sulphate
None of these
Solder

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Chemistry
Vulcanization of rubber is carried out by adding

Phosphorus
Sulphur
Ozone
Carbon

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Chemistry
The Refrigerant 'FREON' is

Hydrofluosilicic Acid
Fluorspar and Felspar
Calcium Tetra Fluoride
Difluoro Dichloro Methane

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