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Upendra Bapat an hour ago

Boron has a valency of 3. When it forms ions, the charge is 3+
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Upendra Bapat an hour ago

Resistance depends inversely on cross section area of wire. If cross section area increases, resistance decreases.
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Devanshi Dhaka 2 days, 1 hour ago

Magnesium ribbon reacts with oxygen present in air to farm a protective and inert layer of magnesium oxide on its surface. This layer doesn't react and also prevents the ribbon from burning. Thus it have to be rubbed with sandpaper before burning so that the layer is removed😊

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