National Science Olympiad Forum By SOF Olympiad Trainer

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8
B) 99

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Subject :NSO    Class : Class 8

Fill in the blanks with the most appropriate option.
‘W’ is a very reactive metal, reacts vigorously with oxygen and water therefore, stored in (1) . ‘X’ is a non-metal, soft and dull and, forms (2) oxides with oxygen. ‘Y’ is very reactive (3) , catches fire if exposed to air, therefore, stored in water. ‘Z’ does not react with dilute hydrochloric acid even on heating but it reacts with sulphuric acid. When it is exposed to moist air for long, it acquires a dull (4) coating.

A1-Water, 2-Basic, 3-Metal, 4-Reddish brown
B1-Kerosene, 2-Acidic, 3-Metal, 4-Red
C1-Kerosene, 2-Acidic, 3-Non-metal, 4-Green
D1-Water, 2-Basic, 3-Non-metal, 4-Green


copper does not react with sulphuric acid

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 5

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