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Ritesh Narayan Das from Adamas International School, Kolkata

Subject :Chemistry Class : Class 7

Two drops of dilute sulphuric acid were added to 1 g of copper sulphate powder and then small amount of hot water was added to dissolve it (step I). On cooling, beautiful blue coloured crystals got separated (step II). Step I and Step II are

A physical and chemical changes respectively
B chemical and physical changes respectively
C both physical change
D both chemical change.

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Ritesh Narayan Das from Adamas International School, Kolkata

Subject :Chemistry Class : Class 7

Which of the following is a physical change?

A Rusting of iron
B Combustion of magnesium ribbon
C Burning of candle
D Melting of wax

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Ans 1:

mananjain from Modern School, Jaipur

Class : Class 8

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Shaan Gupta from SUN INTERNATIONAL SCHOOL, Patna

Subject :Chemistry Class : Class 8

I want to give the test online.. How can I? ?

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sk from abc, noida

Subject :Chemistry Class : Class 7

Melting of wax is

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