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Chemistry

Chemistry
What is the atomic number of Oxygen

22
8
12
5

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Chemistry
Which one of the following is not a characteristic feature of alloys? They are

Compounds
Solutions
Homogeneous systems
Mixtures

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Chemistry
When a nutrient like fertilizer is present in large quantities in a water bodies, plants grow and decay in large numbers because of suffocating of pond that does not leave enough oxygen needed to support life. This type of pollution is called

Eutrophication
Green house effect
None of these
Smog

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Chemistry
The metal that is used as a catalyst in the hydrogenation of oils is

Cu
Pb
Ni
Pt

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

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

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Chemistry
Persons working in cement plants and lime stone quarries are prone to disease like

Cancer
Silicosis
Asthma
Pneumoconiosis

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