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Subject :NSO    Class : Class 7

Consider the following list of materials to answer the question which follows.
I. Liquid oxygen
II. Soap solution
III. Brass
IV. Silver
V. Petrol.
Which one of the following is correct?

A I, III and IV are elements
B II, III and V are mixtures
C III and IV are elements
D III and V are compounds


Ans 1:

Class : >Class 7

Ans 2:

Class : >Class 7
Liquid oxygen is impure so ans is B

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