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SHANTANU from STELLA MARIS INTER COLLEGE, Lucknow
Subject :NSO    Class : Class 5

Based on the given data about an unknown material, which of these can be the unknown material?

(A) Gold

(B) Aluminium

(C) Copper

(D) All of these

Ans 1:

Gauri Singh from St Johns School Marhauli, Varanasi
Class : Class 8
The correct answer is opt. D

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