The relative density of a substance is the ____.
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Plaster of Paris ______.
I. changes into gypsum on mixing with water
II. is CaSO4.2H2O
III. is used for decoration
What is the position of metallic ion and non-metallic ion in a chemical formula?
An electron loses potential energy when it
An object is placed at the centre of curvature of a concave mirror. Its image is formed at
What is formed when helium atom loses one electron?
DRDL stands for
Valency of an element depends on which of the following?
I. Number of losing electron
II. Number of gaining electron
III. Number of sharing electron