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Chemistry

Chemistry
Basicity of boric acid, H3BO3 is

2
3
5
4

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Chemistry
Sulphur dioxide bleaches colouring matter by :

Dehydration
Oxidation
Reduction
Decomposition

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Chemistry
The number of neutrons present in an element having mass number 226 and atomic number 88 is :

50
88
314
138

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Chemistry
Milk is a colloidal system in which:

Fat is dispersed in water
Fat is dissolved
Water is dispersed in fat
Fat and water are dispersed in each other

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Chemistry
Gobar gas mainly contains

Carbon monoxide
Carbon dioxide
Methane
Hydrogen sulphide

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Chemistry
Which one of the following statement is correct ?Ozone is found in the earth's atmosphere mostly between

20 and 50 km
50 and 100 km
10 and 20 km
5 and 10 km

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