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In an experiment, 4.90 g of copper oxid...

In an experiment, `4.90` g of copper oxide was obtained from `3.92` g of copper. In another experiment, `4.55` g of copper oxide gave, on reduction, `3.64` g of copper. Show with the help of calculation that these figures verify the law of constant proportions.

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The ratio (or proportion) of copper and oxygen elements in the two samples of copper oxide compound is the same `4 : 1`. So, the given figures verify the law of constant proportions
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LAKHMIR SINGH & MANJIT KAUR-ATOMS AND MOLECULES-Exercise
  1. Copper sulphate reacts with sodium hydroxide to form a blue preci...

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  2. Potassium chlorate decomposes, on heating, to form potassium chlori...

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  3. In an experiment, 4.90 g of copper oxide was obtained from 3.92 g of...

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  4. Magnesium and oxygen combine in the ratio of 3 : 2 by mass to for...

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  5. When 5g of calcium is burnt in 2g of oxygen, then 7 g of calcium o...

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  6. An liquid compound X of molecular mass 18 u can be obtained from a n...

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  7. One of the forms of a naturally occurring solid compound P is usually...

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  8. What do we call those particles which have more or less electrons t...

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  9. What do we call those particles which have : (a) more electrons ...

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  10. Define 'formula mass' of a compound.

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  11. What do we call those particles which are formed : (a) by the gain o...

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  12. State whether the following statements are true or false : (a) A ...

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  13. Write dow the formulae for the following compounds : (a) Calcium o...

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  14. An element Z has a valency of 3. What is the formula of oxide of Z ?

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  15. What is the name of a particle which contains 10 electrons, 11 protons...

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  16. Name the particle which has 18 electrons , 18 neutrons and 17 protons...

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  17. Fill in the following blanks with suitable words : (a) The particl...

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  18. Name the element water is made of. What are the valencies of the eleme...

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  19. If the valency of hydrogen is 1 and that of nitrogen is 3, work out t...

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  20. Work out the formula for sulphur dioxide. (Valencies : S = 4 , O = ...

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