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How did Bohr proved that an atom must exist?

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Define and explain Avogadro's number and mole. What is the relationship between them?

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What is an isotopes? Describe the isotopes of hydrogen with diagrams

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Give an account on any five main branches of Chemistry and their uses?

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How are canal rays produced? Give their properties

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Differentiate between Rutherford atomic theory and Bohr's atomic theory?

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What is Thomas plum pudding theory?

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How Chadwick discovered neutrons? Give properties of neutron.

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Define and explain with example: a) Ionic compounds b) Covalent compounds?

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How was it proved that electrons are fundamental particles of an atom?

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What is chemical formula? How chemical formula is written; which parameters are used for it, what are the significance of it?

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Why is not advisable to wear dark colours in summer?

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How a green house becomes Heat Trap?

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Why are sauce pans made of metals? Why are sauce pans made of metals?

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What are the uses of convention current?

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Why a balloon inflated with hot air rises up?

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What do you mean by bad conductors of heat?

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Describe the working of leslies cube?

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What measures are taken to conserve energy in houses?

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How many ways are to transfer of heat

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