Class 7 Science MCQs - Chapter 7
Elements and Compounds Quiz Questions & Answers PDF Download - 3
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Elements and Compounds Exam Questions and Answers PDF Download: Test 3
When iron and sulphur are mixed together at room temperature there is lack of
- reaction
- production of new product
- mixed reaction
- both a and b
Due to temperature sensitivity the element which is filled in thermometer, is
- mercury
- copper
- helium
- oxygen
Heating, exposing to light or passing electricity will only let to decompose
- element
- compound
- mixture
- liquid
A substance which cannot be broken into further simpler substance by any chemical reaction is called
- element
- compound
- mixture
- solution
Nitric acid is combined with oxygen to produce brown fume of
- nitrogen oxide
- nitrogen dioxide
- carbon dioxide
- nitrogen
Class 7 Science Mock Tests
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