Class 7 Science Quiz e-Book PDF | Solutions App Download
Class 7 Science Study Material: Practice Test 15 (Chapter 22)
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A ph scale ranges from zero to
For removing paints and dyes 'caustic potash' is used. Its scientific name is
The 'pH' of rain water is slightly
A scale which is used to measure hoe acidic or alkaline is called
If the color, density, appearance and other physical and chemical properties are the same, solution is called
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