Is matter around us pure Worksheet-7
A. Cesium B. Gallium C. Mercury D. Bromine
A. Diamond B. Silicon C. Fullerene D. Carbon fibre
A. Yes B. No C. Depends on the area
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A. Yellow coloured sulphur will float at the surface of solution
B. Sulphur will dissolve completely forming true solution
C. Yellow ppt of sulphur will be formed and supernatant solution will be colourless
D. The solution will become dark yellow in colour due to dissolution of more sulphur in it
A. Chemical
B. Physical
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(a) Which solid dissolves best in water at 20°C ?
(b) Which solid is maximum soluble in alcohol ?
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