LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q A

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Copper reacts with oxygen to form two oxides, ${Cu}_{2} O$ and $CuO$ . The ratio between the masses of copper which react with a fixed mass of oxygen is

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Important Questions on Atoms and Molecules

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LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q A

Valency of noble gases is

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LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q A

The mass of sulphur dioxide that will contain

6.022 \times 10^{22}

molecules is

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LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q A

The number of atoms of hydrogen present in 1 mole of ethyne

C_{2} H_{2}

is

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LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q A

The reference standard used for defining the atomic mass unit is

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LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q A

The element whose gram-atomic mass and gram-molecular mass are the same is-

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LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q A

The ratio of H∶O by mass in water is

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LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q A

The atomic mass of potassium is 39. The number of moles in 78 g of potassium is

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LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q A

The indivisibility of atom was proposed by